Resumen Introducción. Las regiones cultivables a menudo carecen de nutrientes suficientes en el suelo, por lo que es necesario utilizar fertilizantes. Sin embargo, el uso excesivo de fertilizantes puede dañar el medioambiente, la salud humana y la seguridad alimentaria. Los reguladores de crecimiento naturales derivados de plantas son respetuosos con el medioambiente y tienen un precio razonable. Las fitohormonas jasmonato de metilo (MeJA) y ácido salicílico (SA) son cruciales para mejorar la biomasa vegetal, la calidad, la productividad y la resistencia a tensiones ambientales. Objetivo. Evaluar el efecto foliar de MeJA y SA sobre la calidad y la producción de frutos de cultivares de tomate en condiciones de invernadero. Materiales y métodos. La prueba se llevó a cabo en la Universidad de Diyala, Irak, del 1 de diciembre de 2022 al 5 de junio de 2023. Se evaluaron aplicaciones foliares de 0 mg/L, 200 mg/L de SA y 200 mg/L de MeJA para determinar los efectos sobre calidad de fruto y la producción cultivares de tomate cherry de crecimiento vegetativo indeterminado: LA4013, LA353, LA2921, LA3899 e IQ2, con un diseño de bloques completos al azar y tres repeticiones por tratamiento. Resultados. El cultivar IQ2 produjo la fruta más pesada (82,13 g), el mayor rendimiento por planta (4,56 kg/planta), el mayor rendimiento total (4,56 t/invernadero) y la mayor acidez titulable (0,62 %). El cultivar LA4013 presentó el mayor número de frutos (612,88 frutos/planta) y el mayor contenido de sólidos solubles totales (2,933 %). La aplicación foliar de SA a 200 mg/L resultó en el índice de clorofila más alto (36,68 SPAD), el mayor número de frutos (373,73 frutos/planta), el mayor rendimiento por planta (3,15 kg/planta) y el mayor rendimiento total (3,93 t/invernadero). Conclusión. Al considerar todas las variables en conjunto, los mejores genotipos fueron IQ2 y LA4013, los cuales resultaron superiores a los demás genotipos en los ensayos de calidad y rendimiento. La aplicación foliar de SA a 200 mg/L mejoró el rendimiento y la calidad de los tomates cherry en condiciones de invernadero.

Abstract Introduction. Arable regions often lack sufficient soil nutrients, which means that fertilizers must be used. However, using fertilizers excessively can harm the environment, human health and food safety. Natural growth regulators derived from plants are environmentally friendly and reasonably priced. The phytohormones methyl jasmonate (MeJA) and salicylic acid (SA) are crucial for enhancing plant biomass, quality, productivity and resistance to environmental stresses. Objective. To evaluate the foliar effect of MeJA and SA on fruit quality and production of colorful tomato cultivars under greenhouse conditions. Materials and methods. The trial was conducted at the University of Diyala, Iraq, from December 1, 2022, to June 5, 2023. Foliar applications of 0 mg/L, 200 mg/L SA and 200 mg/L MeJA were evaluated to determine their effects on fruit quality and production of colorful indeterminate cherry tomato cultivars: LA4013, LA353, LA2921, LA3899 and IQ2. A randomized complete block design was used, with each treatment having three replicates. Results. The cultivar IQ2 produced the heaviest fruit (82.13 g), the highest plant yield (4.56 kg/plant), the highest total yield (4.56 t/house) and the highest titratable acidity (0.62 %). The cultivar LA4013 had the highest fruit number (612.88 fruits/plant) and the highest total soluble solids (2.933 %). The foliar application of 200 mg/L SA resulted in the highest chlorophyll index (36.68 SPAD), the highest fruit number (373.73 fruits/plant), the highest plant yield (3.15 kg/plant) and the highest total yield (3.93 t/house). Conclusion. Considering all variables together, the best-performing genotypes were IQ2 and LA4013, which were superior to other genotypes in quality and yield trials. The foliar application of 200 mg/L SA improved both yield and quality of cherry tomatoes under greenhouse conditions.

Abstract In the Andean hillsides of Ecuador, indigenous populations use land mainly for grazing sheep and cattle. Animal response depends exclusively on the quality of forage and the soil’s physical and chemical conditions. The objective of this research was to evaluate two scenarios for intensifying pastures based on perennial ryegrass (Lolium perenne) and white clover (Trifolium repens), used at rest periods of 45- and 60 days in sites between 3,000-3,400 m a.s.l. used for grazing sheep and cows. These scenarios were compared with a natural grassland based on a plant community composed of Stipa ichu, Holcus lanatus, Rumex acetocella, and Paspalum sp., used in a traditional system with rest periods of 60-75 days in sites between 3,500-3,700 m a.s.l. in the Chimborazo River micro-watershed. Soil sampling was conducted at both sites to determine the soil fertility profile. Regarding the forage component, chemical composition, animal carrying capacity, milk production, and estimated enteric CH4 emissions were determined. In sheep serum, Ca, P, and Mg profiles, and the activity of AST, ALT, and FA enzymes were analyzed. The data were analyzed using ANOVA and Tukey 5% as a means comparison test. The results showed a better physicochemical property of the soil at the lower altitude. The intensification of pasture management and grazing through the utilization of rest periods of 45 days or less may represent a productive and low-emission option.

Resumen Las poblaciones indígenas en las laderas andinas de Ecuador utilizan sus tierras principalmente para el pastoreo de ovejas y ganado. La respuesta animal depende exclusivamente de la calidad del forraje y de las condiciones físicas y químicas del suelo. El objetivo de esta investigación fue evaluar dos escenarios para la intensificación de pastizales basados en ballica perenne (Lolium perenne) y trébol blanco (Trifolium repens), utilizados con intervalos de descanso de 45 y 60 días, en sitios situados entre 3.000-3.400 m s.n.m para el pastoreo de ovejas y vacas. Estos escenarios se compararon con un pastizal natural basado en una comunidad vegetal compuesta por Stipa ichu, Holcus lanatus, Rumex acetocella y Paspalum sp., utilizado en un sistema tradicional con periodos de descanso de 60-75 días en sitios situados entre 3.500-3.700 m s.n.m. en la microcuenca del río Chimborazo. Se realizaron muestreos de suelo en ambos sitios para determinar el perfil de fertilidad del suelo. En cuanto al componente forrajero, se determinó la composición química, la capacidad de carga animal, la producción de leche y las emisiones estimadas de CH4 entérico. En el suero de oveja, se analizó el perfil de Ca, P, Mg y la actividad de las enzimas AST, ALT y FA. Los datos se analizaron utilizando ANOVA y Tukey al 5% como prueba de comparación de medias. Los resultados mostraron mejores propiedades químicas y físicas del suelo a menor altitud. La intensificación del manejo de pastizales y del pastoreo mediante la utilización de periodos de descanso de 45 días o menos aparentemente representa opciones productivas y de bajas emisiones.

ABSTRACT The anti-clogging device of a no-till seeder is an important component that affects the seeding quality. In one year two crop area of China, a no-tillage seeder for corn generally includes a passive anti-clogging device, and there are often problems with straw winding around working parts due to the low straw cleaning rate. To solve these problems, a support cutting anti-clogging device with vibration for a no-till seeder was designed in this study to efficiently cut wheat stalks and remove them to the sides of the seedbed. Through theoretical calculations and kinematic analysis, the main structural parameters of the device were limited to small ranges of values: the mounting angle of the vibrating knife was in the range θ1 = 70–82°, the amplification was in the range l1 = 14–24 mm, and the frequency was in the range ωm = 240–340 rad/min. To analyse the effects of the main parameters on the average straw cutting rate, soil bin experiments were carried out using an orthogonal multinomial regressive experimental design with three factors and three levels. The optimal structural parameters derived in this way were as follows: mounting angle for the vibrating knife θ1 = 70.7°, amplification l1 = 19 mm, and frequency ωm = 330.2 rad/min. The results of adaptability and comparison tests showed that the average straw cutting rate was 93.30% when the proposed anti-clogging device with vibration was used. Compared to traditional devices, the cutting rate for the device was increased by 12.82%, and the metrics were superior to those of a traditional anti-clogging device. This research can serve as a reference for designing anti-clogging devices for no-till seeders.

ABSTRACT Biochar can promote crop production and soil quality. However, its characteristics depend on the waste used in its production and its effects may vary according to the species being cultivated and the management adopted. The aim of this study was to evaluate the application of biochar from animal waste on soil quality and the agronomic characteristics of the cowpea. An experiment was set up to test three types of biochar (bovine-BB, swine-SB and poultry-BP), with added fertiliser (BBF, SBF and BPF) and two control treatments, including the addition of calcium magnesium oxide (CT) and calcium magnesium oxide with fertiliser (CTF), giving a total of eight treatments with four replications. There was a respective increase of up to 102.94%, 1048%, 1560% and 360.22% in stem diameter, number of pods, number of grains per pod and stem dry matter from adding the biochar. The poultry biochar increased each of the above parameters even with no added fertiliser. There was no difference in basal soil respiration or β-glucosidase enzyme activity, whereas organic carbon (TOC), total nitrogen (TN), microbial carbon and soil labile carbon were greater with biochar. BBF gave the highest TOC content (24.40 g kg-1), while BP and BPF increased TN by around 61%. The application of biochar + fertiliser contributed to an average reduction of 56% in the soil metabolic quotient. Poultry biochar favoured both the agronomic characteristics of the cowpea and soil quality, while bovine biochar showed more marked results with the addition of fertiliser. However adopted bovineBB, bovineBB BB, BB (bovine-BB swineSB swine SB poultryBP, poultryBP , poultry-BP) BBF, (BBF CT (CT CTF, CTF (CTF) replications 10294 102 94 102.94% 1048 1048% 1560 36022 360 22 360.22 diameter pods βglucosidase β glucosidase activity TOC, (TOC) TN, (TN) 24.40 2440 24 40 (24.4 kg1, kg1 kg 1 kg-1) 61 61% 56 quotient poultry-BP (CTF 1029 10 9 102.94 104 156 3602 36 2 360.2 (TOC (TN 24.4 244 4 (24. kg-1 6 5 102.9 15 3 360. 24. (24 kg- 102. (2 (

ABSTRACT Proper waste management is a major worldwide concern; waste is disposed of directly into the environment, affecting water, soil and air quality. The development and production of green energy sources is strongly encouraged in modern society. The aim of this study, in accordance with Sustainable Development Goals (SDGs) 1, 2 and 7 of the 2030 Agenda of the UN, is to combine the correct disposal of animal waste with the generation of energy to mitigate the energy insecurity of families in an extremely vulnerable semi-arid region in the north-east of the country using biodigesters. To this end, a conceptual proposal was drawn up for a low-cost, easy-to-maintain and easy-to-use biodigester. A small-scale prototype was used to assess its operation by evaluating the main factors that affect biogas production (pH, temperature and the biomass properties: total solids, fixed solids, volatile solids, concentration of volatile fatty acids and C/N ratio). Evaluation of the test prototype gave satisfactory results that corroborate other studies and make it possible to propose an economically viable and efficient full-scale biodigester for biogas production. concern environment water quality society study SDGs (SDGs 1 203 UN semiarid semi arid northeast north east biodigesters end lowcost, lowcost low cost, cost low-cost easytomaintain easy maintain easytouse use smallscale small scale pH, pH (pH properties solids CN C N ratio. ratio . ratio) fullscale full 20

RESUMO: A quantificação e avaliação das mudanças espaço-temporais na qualidade do solo são importantes para compreender os mecanismos de degradação do solo e restaurar a produtividade da terra danificada. Contudo, os efeitos da subsidência da mineração de carvão nas características espaciais e temporais da qualidade do solo não são bem compreendidos. Foram investigados os teores de pH, matéria orgânica (MO), nitrogênio total (NT), nitrogênio nitrato (NN), nitrogênio amoniacal (AN), fósforo total (TP), fósforo disponível (FA), potássio disponível (AK), total potássio (TK), capacidade de troca catiônica (CEC), atividade de sacarase (SA), atividade de urease (UA), atividade de fosfatase (PA), atividade de catalase (CA) e atividade de desidrogenase (DA) na área subsidiada de mineração de carvão. Os resultados mostraram que os teores de TN, NN, AN, TP, AK, TK, SA, UA, PA, CA e DA apresentaram diferenças significativas (P < 0,05) entre as quatro estações. Comparada com a camada superior (0-20 cm), a camada inferior (20-40 cm) continha maiores teores de AN, NN, TN, TP e TK, mas menores teores de SA, UA, PA, CA e DA. Os NN, AP, TP, AK e UA foram identificados como indicadores-chave no conjunto mínimo de dados utilizando análise de componentes principais. As mudanças sazonais no índice de qualidade do solo (IQS) ocorreram na seguinte ordem: inverno (0,707), primavera (0,681), verão (0,616) e outono (0,563). O valor do IQF foi mais alto para a posição 3 do declive médio (0,508), seguido pela posição 4 do declive inferior (0,507), posição 1 do declive superior (0,446), posição 2 do declive superior (0,442) e posição 5 do declive inferior (0,437). Com base nestas mudanças espaço-temporais na qualidade do solo, foi sugerido que a aplicação de múltiplos tipos de uso da terra pode ser um método útil para a recuperação de terras e o interesse dos agricultores locais na área subsidiada de mineração de carvão. RESUMO espaçotemporais espaço danificada Contudo compreendidos pH MO, MO , (MO) NT, NT (NT) NN (NN) AN (AN) (TP) FA, FA (FA) (AK) TK (TK) CEC, CEC (CEC) SA (SA) (UA) PA (PA) (CA (DA TN P 0,05 005 0 05 estações 020 20 (0-2 cm, cm 2040 40 (20-4 AP indicadoreschave indicadores chave principais IQS (IQS ordem 0,707, 0707 0,707 707 (0,707) 0,681, 0681 0,681 681 (0,681) 0,616 0616 616 (0,616 0,563. 0563 0,563 . 563 (0,563) 0,508, 0508 0,508 508 (0,508) 0,507, 0507 0,507 507 (0,507) 0,446, 0446 0,446 446 (0,446) 0,442 0442 442 (0,442 0,437. 0437 0,437 437 (0,437) (MO (NT (NN (AN (TP (FA (AK (TK (CEC (SA (UA (PA 0,0 00 02 (0- 204 (20- 070 0,70 70 (0,707 068 0,68 68 (0,681 0,61 061 61 (0,61 056 0,56 56 (0,563 050 0,50 50 (0,508 (0,507 044 0,44 44 (0,446 (0,44 043 0,43 43 (0,437 0, (0 (20 07 0,7 7 (0,70 06 0,6 6 (0,68 (0,6 0,5 (0,56 (0,50 04 0,4 (0,4 (0,43 ( (2 (0,7 (0, (0,5

ABSTRACT: Quantification and evaluation of the spatiotemporal changes in soil quality is important to understand soil degradation mechanisms and restore the damaged land productivity. However, the effects of coal mining subsidence on the spatial and temporal characteristics of soil quality are not well understood. We investigated the contents of pH, organic matter (OM), total nitrogen (TN), nitrate nitrogen (NN), ammonia nitrogen (AN), total phosphorus (TP), available phosphorus (AP), available potassium (AK), total potassium (TK), cation exchange capacity (CEC), sucrase activity (SA), urease activity (UA), phosphatase activity (PA), catalase activity (CA) and dehydrogenase activity (DA) in the coal mining subsided area. The results showed that the contents of TN, NN, AN, TP, AK, TK, SA, UA, PA, CA and DA exhibited significant (P < 0.05) differences among the four seasons. Compared with the upper layer (0-20 cm), the lower layer (20-40 cm) contained higher contents of AN, NN, TN, TP and TK but lower contents of SA, UA, PA, CA and DA. The NN, AP, TP, AK and UA were identified as key indicators in the minimum dataset using principal component analysis. The seasonal changes of soil quality index (SQI) were in the following order: winter (0.707), spring (0.681), summer (0.616), and autumn (0.563). The spatial changes of SQI were highest for middle slope position 3 (0.508), followed by lower slope position 4 (0.507), top slope position 1 (0.446), upper slope position 2 (0.442), and bottom slope position 5 (0.437). Based on these spatiotemporal changes in soil quality, it was suggested that the application of multiple land use types may be a useful method for land reclamation and the interest of local farmers in the coal mining subsided area. ABSTRACT productivity However understood pH OM, OM , (OM) TN (TN) NN (NN) AN (AN) (TP) AP (AP) (AK) (TK) CEC, CEC (CEC) SA (SA) (UA) PA (PA) (CA (DA area P 0.05 005 0 05 seasons 020 20 (0-2 cm, cm 2040 40 (20-4 analysis (SQI order 0.707, 0707 0.707 707 (0.707) 0.681, 0681 0.681 681 (0.681) 0.616, 0616 0.616 616 (0.616) 0.563. 0563 0.563 . 563 (0.563) 0.508, 0508 0.508 508 (0.508) 0.507, 0507 0.507 507 (0.507) 0.446, 0446 0.446 446 (0.446) 0.442, 0442 0.442 442 (0.442) 0.437. 0437 0.437 437 (0.437) (OM (TN (NN (AN (TP (AP (AK (TK (CEC (SA (UA (PA 0.0 00 02 (0- 204 (20- 070 0.70 70 (0.707 068 0.68 68 (0.681 061 0.61 61 (0.616 056 0.56 56 (0.563 050 0.50 50 (0.508 (0.507 044 0.44 44 (0.446 (0.442 043 0.43 43 (0.437 0. (0 (20 07 0.7 7 (0.70 06 0.6 6 (0.68 (0.61 0.5 (0.56 (0.50 04 0.4 (0.44 (0.43 ( (2 (0.7 (0.6 (0.5 (0.4 (0.

RESUMO A demanda mundial por produtos madeireiros e a escassez de espécies de madeira de boa qualidade estão pressionando as florestas nativas. Esta pesquisa teve como objetivo avaliar a eficiência do óleo de candeia (Eremanthus erythropappus) bruto para melhorar a resistência da madeira de Pinus taeda aos fungos apodrecedores Rhodonia (≈Postia) placenta, Gloeophyllum trabeum, Neolentinus lepideus (podridão parda) e Pycnoporus sanguineus (podridão branca) em ensaios de apodrecimento acelerado em laboratório. As amostras tinham dimensões nominais de 1,90 × 1,90 × 1,90 cm. O óleo foi aplicado nas superfícies da madeira com pincel, visando obter retenções nominais de 15; 30; 45 e 60 kg de óleo por m3 de madeira. As amostras após o tratamento atingiram retenções médias de 16,25; 28,75; 41,50; e 53,75 kg m-3, e foram submetidas ao teste solo-bloco (apodrecimento acelerado) durante 12 semanas. O aumento da retenção de óleo provocou redução na perda de massa da madeira de Pinus taeda submetida aos fungos testados. Observou-se que a retenção de 16,25 kg m-3 foi capaz de inibir a degradação do fungo Rhodonia (≈Postia) e prevenir o ataque de outros fungos xilófagos. Os maiores danos foram observados para Rhodonia (≈Postia) e os menores danos para Pycnoporus sanguineus. O óleo conferiu maior resistência à madeira de Pinus taeda aos fungos testados, indicando ser útil para o tratamento de madeiras que ficarão em contato com animais domésticos e seres humanos, uma vez que não é toxico a tais organismos. nativas Eremanthus erythropappus ≈Postia Postia (≈Postia placenta trabeum podridão parda branca laboratório 190 1 90 1,9 cm pincel 15 30 4 6 m 1625 16 25 28,75 2875 28 75 41,50 4150 41 50 5375 53 53,7 m3, 3, 3 solobloco solo bloco semanas testados Observouse Observou se 16,2 m- xilófagos humanos organismos 19 9 1, 162 2 28,7 287 7 41,5 415 5 537 53, 16, 28, 41,

ABSTRACT World demand for wood products and the shortage of good quality lumber species are exerting pressure on native forests. This study aimed to evaluate the efficiency of Eremanthus erythropappus crude oil in improving the resistance of Pinus taeda wood to Rhodonia (≈Postia) placenta, Gloeophyllum trabeum, Neolentinus lepideus (brown rot) and Pycnoporus sanguineus (white rot) in accelerated laboratory decay tests. Test samples measured 1.90 × 1.90 × 1.90 cm. Oil was applied to wood surfaces using a brush to obtain nominal retentions of 15, 30, 45, and 60 kg of oil per m3 of wood. After treatment, the samples reached average retentions of 16.25, 28.75, 41.50, and 53.75 kg m-3, respectively, and were submitted to a soil block decay test (accelerated decay test) for 12 weeks. Increased oil retention caused a decline in the mass loss of Pinus taeda wood exposed to the fungi tested. A retention of 16.25 kg m-3 inhibited Rhodonia placenta degradation and prevented other xylophagous fungi attacks. The most severe decay occurred with Rhodonia placenta and the least with Pycnoporus sanguineus. Oil improved Pinus taeda resistance to the decay fungi, indicating that it is useful for treating wood in contact with domestic animals and humans, since it is not toxic to them. forests ≈Postia Postia (≈Postia trabeum brown rot white tests 190 1 90 1.9 cm 15 30 45 6 m treatment 1625 16 25 2875 28 75 28.75 4150 41 50 41.50 5375 53 53.7 m3, 3, 3 respectively weeks tested 16.2 m- attacks humans them 19 9 1. 4 162 2 287 7 28.7 415 5 41.5 537 53. 16. 28. 41.

RESUMO A Matéria Orgânica do Solo, é um dos mais importantes indicadores da qualidade e sustentabilidade dos ecossistemas nativos e cultivados, pois influencia os atributos químicos e físicos do solo, como a capacidade de troca catiônica, a agregação, a retenção de água e o fornecimento de nutrientes para as plantas. Este estudo teve por objetivo, avaliar os atributos físicos e a distribuição do carbono orgânico nos agregados de solos sob diferentes manejos. Foram coletadas amostras de solo deformadas e indeformadas nas camadas de 0-0,1 m; 0,1-0,2 m e 0,2-0,3 m, em manejos de produção conservacionistas (sequeiro e irrigado) e manejo de produção não conservacionista (sequeiro). Avaliou-se os atributos químicos, granulométricos, a densidade do solo e os teores de carbono orgânico nos macro e microagregados para os três manejos. Para os manejos de produção conservacionistas, além dessas análises, realizou-se a determinação do diâmetro médio ponderado, do diâmetro médio geométrico, do índice de estabilidade de agregados e da porosidade total do solo. Os dados foram analisados por meio dos testes Kruskal -Wallis e teste t, devido à ausência de delineamento experimental, e por parte dos dados, não atenderem o teste de Normalidade (ShapiroWilk). A densidade e a porosidade total do solo não diferiram nos manejos conservacionistas (sequeiro e irrigado). O manejo conservacionista irrigado teve agregados com maiores diâmetros médios ponderado e geométrico, e maior índice de estabilidade de agregados. Os manejos conservacionistas (sequeiro e irrigado) tiveram maiores teores de carbono orgânico nos macros e microagregados. Solo cultivados catiônica agregação plantas objetivo 00,1 001 0 0,1 1 0-0, 0,10,2 0102 0,2 2 0,1-0, 0,20,3 0203 0,3 3 0,2-0, sequeiro sequeiro. . (sequeiro) Avaliouse Avaliou se granulométricos análises realizouse realizou geométrico Wallis t experimental ShapiroWilk. ShapiroWilk (ShapiroWilk) irrigado. 00 00, 01 0, 0-0 10 0,10, 010 02 0,1-0 20 0,20, 020 03 0,2-0 (ShapiroWilk 0- 0,10 0,1- 0,20 0,2-

ABSTRACT Soil organic matter is one of the most important indicators of the quality and sustainability of native and cultivated ecosystems, as it influences the chemical and physical properties of the soil, such as cation exchange capacity, aggregation, water retention, and supply of nutrients to plants. This study evaluated the physical properties and distribution of organic carbon in soil aggregates under different management practices. Disturbed and undisturbed soil samples were collected in the 0.0-0.1 m, 0.1-0.2 m, and 0.2-0.3 m layers under conservationist (rainfed and irrigated) and conventional (rainfed) management. The chemical properties and particle size, soil density, and organic carbon content in macro and microaggregates were assessed for the three management types. For conservationist management, in addition to these analyses, the weighted mean diameter, geometric mean diameter, aggregate stability index, and total soil porosity were determined. The data were analyzed using the Kruskal-Wallis test and the t-test, as there was no experimental design, and some of the data did not meet the normality test (Shapiro-Wilk). Soil density and total porosity did not differ for conservationist management (rainfed and irrigated). The irrigated conservationist management exhibited aggregates with larger weighted and geometric mean diameters and a higher aggregate stability index. Conservationist management (rainfed and irrigated) showed higher organic carbon contents in macro and microaggregates. ecosystems capacity aggregation retention plants practices 0.00.1 0001 0.0 0.1 0 1 0.0-0. 0.10.2 0102 0.2 2 0.1-0. 0.20.3 0203 0.3 3 0.2-0. rainfed size types analyses diameter index determined KruskalWallis Kruskal Wallis ttest, ttest t test, t-test design ShapiroWilk. ShapiroWilk Shapiro Wilk . (Shapiro-Wilk) irrigated. 00 0.00. 000 0. 01 0.0-0 10 0.10. 010 02 0.1-0 20 0.20. 020 03 0.2-0 (Shapiro-Wilk 0.00 0.0- 0.10 0.1- 0.20 0.2-

ABSTRACT During the germination process, seeds are susceptible to abiotic and biotic stresses, such as attacks by pests and pathogens. In this context, chemical treatment of seeds can promote physiological and morphological changes in seeds and seedlings, in addition to protecting seeds. Two experiments were conducted with the following objectives: (I) assess the effect of soybean seed water content on seedling emergence under different water availability conditions; (II) assess the effect of chemical treatment of soybean seeds on seedling emergence under water stress conditions. In the first experiment, seeds of four cultivars had their water content adjusted to 8, 11, and 14% and were sown in soil under four water potential levels (-0.01; -0.02; -0.10 and -0.40 MPa). In the second experiment, seeds of the same cultivars were treated using metalaxyl, fludioxonil and thiamethoxam, and untreated seeds were used as controls. Sowing was carried out in soil under four water potentials, and seed quality parameters were evaluated in both experiments. The data subjected to analysis of variance, and the means were compared using the Tukey test at 5% probability level. There is no restriction on sowing soybean seeds with water content between 8 and 14% when the soil is under full water availability. Under conditions of soil water restriction, it is recommended to use seeds with water content between 11 and 14%. Under water deficit conditions, treated soybean seeds show better membrane maintenance and superior performance in seedling emergence. process stresses pathogens context seedlings objectives I (I II (II experiment 14 0.01 001 0 01 (-0.01 0.02 002 02 -0.02 0.10 010 10 -0.1 0.40 040 40 -0.4 MPa. MPa . MPa) metalaxyl thiamethoxam controls potentials variance 5 level 1 0.0 00 (-0.0 -0.0 0.1 -0. 0.4 04 4 0. (-0. -0 (-0 - (- (

RESUMEN Uno de los aspectos más importantes para una acuacultura sustentable es el manejo adecuado del alimento, para lo cual la mejor estrategia es la implementación de alimentadores automáticos que permiten optimizar las raciones de alimento y optimizar el rendimiento productivo. El presente estudio evaluó el impacto de la alimentación automática sobre la calidad del suelo en el cultivo de Litopenaeus vannamei en tres piscinas experimentales en un periodo de tres meses; se evaluaron las cantidades de materia orgánica, carbono orgánico, pH, nitrógeno y la relación carbono-nitrógeno (C/N) para discernir si existen diferencias en los puntos de alimentación y de tipo pulmón. En los análisis finales no se observaron diferencias estadísticas (p ≥ 0.05) entre los puntosde alimentación y entre las piscinas. Estos resultados demuestran que la alimentación automática no provoca cambios en la calidad del suelo en el cultivo de L. vannamei.

ABSTRACT One of the most important aspects for sustainable aquaculture is the proper management of feed, for which the best strategy is the implementation of automatic feeders that allow optimizing feed rations and optimizing productive performance. The present study evaluated the impact of automatic feeding on soil quality in the cultivation of Litopenaeus vannamei in three experimental pools in a period of three months; where were evaluated the amount of organic matter, organic carbon, pH, nitrogen and the carbon-nitrogen ratio (C/N) to evaluate if there are differences in the feeding and lung-type zones. In the final analyzes no statistical differences (p ≥ 0.05) were observed in the parameters between the feeding areas and between the pools. These results demonstrate that automatic feeding does not cause changes in soil quality in the cultivation of L. vannamei.

RESUMEN El manejo inadecuado de los pastizales ha provocado la degradación de extensas áreas, la pérdida de productividad y sostenibilidad de muchas de ellas, reflejando una realidad común entre los ganaderos de Colombia. Por ello, en la Estación Agraria Paysandú de la Universidad Nacional de Colombia, ubicada en el corregimiento de Santa Elena de la ciudad de Medellín, se realizó una investigación para determinar un índice de calidad del suelo (SQI) mediante la evaluación de los indicadores físicos y químicos más relacionados con el deterioro y producción de materia seca del pasto kikuyo (Cenchrus clandestinus). Se estableció un conjunto mínimo de datos (MDS) para los indicadores más sensibles, elegidos mediante el análisis de componentes principales PCA, y se utilizó una función de puntuación no lineal para obtener el SQI. Se encontraron diferencias estadísticas entre todos los tratamientos y la producción de materia seca (P<0,05: 1,91x10-32). Los indicadores más sensibles fueron: densidad aparente DR > porosidad total TP > macroporos MAC > microporos MIC > resistencia a la penetración PR > capacidad de intercambio catiónico efectiva ECEC > pH. Como resultado, se obtuvo el siguiente SQI = (0,225×BD) + (0,224×TP) + (0,220×MAC) + (0,218×MIC) + (0,113×PR) + (0,0879×ECEC) + (0,0877×pH). Se sugiere probar el índice en praderas dominadas por pasto kikuyo ubicadas en el trópico alto colombiano. La línea de base es crítica a valores > 0,58 Mg m-3 para BD y > 2,25 MPa para PR. Además, el intervalo de pH óptimo para el desarrollo del pasto kikuyo se situó entre 5,4 y 6,4.

ABSTRACT Inadequate grassland management has resulted in the degradation of extensive areas, loss of productivity and sustainability of many of them, reflecting a common reality among livestock farmers in Colombia. Therefore, at the Paysandú Agricultural Station of the Universidad Nacional de Colombia, located in the Santa Elena township of the city of Medellín, a study was carried out to determine a soil quality index (SQI) by evaluating the physical and chemical indicators that were most related to the deterioration and dry matter production of kikuyu grass (Cenchrus clandestinus). A minimum data set (MDS) was established for the most sensitive indicators, selected by principal component analysis (PCA), and a nonlinear scoring function was used to obtain the SQI. Statistical differences were found between all the treatments in relation to dry matter production (P<0.05: 1.91x10-32). The most sensitive indicators were bulk density BD > total porosity TP > macropores MAC > micropores MIC > penetration resistance PR > effective cation exchange capacity ECEC > pH. As a result, the following formula was obtained: SQI = (0.225×BD) + (0.224×TP) + (0.220×MAC) + (0.218×MIC) + (0.113×PR) + (0.0879×ECEC) + (0.0877×pH). This index should be tested in kikuyu grass-dominated pastures located in the Colombian high tropics. The baseline is critical at values > 0.58 Mg m-3 for BD and > 2.25 MPa for PR. In addition, the optimum pH range for kikuyu grass development was between 5.4 and 6.4.

Resumen Introducción: La mosca de las indias occidentales, Anastrepha obliqua (Macquart), es una de las plagas más importantes económicamente en el cultivo de mango de México y el neotrópico. Objetivo: Analizamos los patrones de la población adulta de A. obliqua y su relación con factores locales y del paisaje. Métodos: Un total de 11 huertos de mango “Manila” fueron caracterizados en estructura biofísica y configuración del paisaje. Los adultos de A. obliqua fueron capturados con trampas (botellas de polietileno cebadas con una proteína) durante tres semanas en junio de 2022. Resultados: Se capturaron 1 869 adultos de A. obliqua, de los cuales 75 % fueron hembras y 25 % machos. La abundancia varió de 68 a 490 moscas adultas por huerto, mientras que la frecuencia de captura de 0.36 a 1.8 moscas/trampa/día. La abundancia incrementó en huertos altamente sombreados y decreció en huertos con suelos compactos. La abundancia y frecuencia incrementaron en huertos cercanos a árboles de Spondias spp. y decreció en huertos cercanos a plantaciones de caña de azúcar. El manejo de la sombra puede ser utilizado como una estrategia efectiva para promover las interacciones que regulan naturalmente la población de A. obliqua, mientras que la compactación del suelo representa una condición ecológica limitante que podría impactar severamente en la supervivencia de larvas de moscas de la fruta. Conclusión: La población adulta de A. obliqua depende de varios factores locales y del paisaje que indican disponibilidad de recursos y condiciones ecológicas. Estos hallazgos podrían considerarse en las estrategias del manejo integrado de esta plaga para promover la protección y el mejoramiento de la calidad de frutos en el cultivo de mango.

Abstract Introduction: The West Indian fruit fly, Anastrepha obliqua (Macquart), is one of the most economically important pests of mangoes in Mexico and the Neotropics. Objective: To analyze adult population patterns of A. obliqua and their relation to local and landscape factors. Methods: We selected 11 “Manila” mango orchards along the middle part of La Antigua River, which were characterized to determine their biophysical structure and landscape configuration considering their distance to six different land uses/land covers. Anastrepha obliqua population was estimated by collecting adult flies in colorless polyethylene plastic bottle traps baited with a protein for three weeks in June 2022. Results: A total of 1 869 adults of A. obliqua were trapped, of which 75 % were females and 25 % were males. Abundance varied from 68 to 490 adult flies per orchard, while capture frequency from 0.36 to 1.8 flies/trap/day. Abundance increased in highly shaded orchards, and capture frequency decreased in orchards with highly soil compaction. Abundance and the frequency of capture increased in orchards near isolated trees of Spondias spp. and decreased in orchards near sugarcane plantations. Shade management in mango orchards may be used as an effective strategy to promote biotic interactions to naturally regulate A. obliqua populations, meanwhile, soil compaction represents a limiting ecological condition, which might severely impact fruit fly larvae survival. Conclusions: Adult population of A. obliqua depends on several local and landscape factors because they indicate resource availability and ecological conditions. These findings could be considered for control strategies in the integrated management of this pest to promote protection and improve the fruit quality of mango crop.

Resumen Introducción. El café (Coffea spp.) es el segundo producto más comercializado a nivel mundial y cultivado en más de ochenta países. Su cultivo es complejo por pertenecer a un ecosistema donde factores abióticos y bióticos tienen dinámicas bajo diferentes condiciones de manejo agronómico. Para comprender el desarrollo de la planta y su influencia en la calidad sensorial del producto, hay que conocer la intrincada interacción entre la planta del café y los microorganismos autóctonos del cultivo. Objetivo. Describir el rol de la microbiota edáfica del café, bacterias y hongos, y cómo puede contribuir en la calidad final de la bebida. Desarrollo. El suelo es uno de los ecosistemas más diversos y menos estudiados, en el cual se desarrollan funciones ecológicas importantes para el crecimiento y desarrollo de las plantas. La identificación de los componentes microbianos del suelo y sus interacciones con otros organismos, son importantes desde el punto de vista agronómico. La microbiota edáfica puede favorecer la fisiología de la planta y de esta manera, se realiza la presente recopilación de información que busca asociar cómo los atributos sensoriales de la bebida de café pueden ser beneficiados por la microbiota del suelo. Se revisaron artículos de ScienceDirect, Scopus, Web of Science y Google Scholar, entre el 2011 y 2023. Los datos muestran la diversidad de rizobacterias promotoras del crecimiento vegetal (RPCV), bacterias fijadoras de nitrógeno (BFN) y hongos formadores de micorrizas arbusculares (HMA) asociados con el cultivo de café. También existen compuestos microbianos que juegan un papel importante en la formación de atributos sensoriales y están relacionados con la calidad en taza del café. Conclusión. La diversidad microbiana del suelo y fruto puede sintetizar o degradar compuestos que influyen en el perfil sensorial de la bebida, lo cual podría tener implicaciones para la sostenibilidad y calidad.

Abstract Introduction. Coffee (Coffea spp.) is the second most traded product globally and is cultivated in over eighty countries. Its cultivation is complex because it belongs to an ecosystem where abiotic and biotic factors interact under various agronomic management conditions. To understand the development of the coffee plant and its influence on the sensory quality of the final product, it is necessary to explore the intricate interactions between the coffee plant and the native microorganisms within the crop environment. Objective. To describe the role of the coffee soil microbiota, specially bacteria and fungi, and how they may contribute to the final quality of the beverage. Development. Soil is one of the most diverse and least studied ecosystems, where crucial ecological functions for plant growth and development take place. Identifying soil microbial components and their interactions with other organisms is important from an agronomic perspective. The soil microbiota can enhance plant physiology; thus, this review aims to connect how the sensory attributes of coffee beverage can be positively influenced by soil microbiota. Articles from ScienceDirect, Scopus, Web of Science, and Google Scholar from 2011 to 2023 were reviewed. The data show the diversity of plant growth-promoting rhizobacteria (PGPR), nitrogen-fixing bacteria (NFB), and arbuscular mycorrhizal fungi (AMF) associated with coffee cultivation. Additionally, microbial compounds play an important role in the formation of sensory attributes and are related to the coffee cup quality. Conclusion. The microbial diversity of soil and on the fruit can synthesize or degrade compounds that affect the sensory profile of the coffee beverage, which could have implications for sustainability and quality.

RESUMEN La labranza ha constituido un pilar fundamental en la instalación y evolución de la agricultura a lo largo del tiempo. Sin embargo, su impacto en la calidad del suelo y la productividad agrícola ha recibido atención significativa debido a los desafíos ambientales y la necesidad de una agricultura sostenible. Este estudio evaluó el estado del arte sobre las prácticas de labranza y su influencia en la calidad del suelo y la productividad agrícola en los últimos 20 años, mediante un análisis de 92 artículos de la base de datos Web of Science. Los resultados revelan un creciente interés en el tema en la última década, con contribuciones destacadas de Estados Unidos, China, Brasil, Canadá e India, enfocándose en sistemas conservacionistas y su relación con la calidad del suelo, la materia orgánica y la productividad agrícola. Los indicadores evaluados más frecuentemente incluyen parámetros físicos (densidad aparente, resistencia a la penetración, agregados, porosidad), químicos (nitrógeno, fósforo, potasio, pH) y biológicos (carbono orgánico, biomasa microbiana, actividades enzimáticas). La revisión sugiere que los sistemas de labranzas conservacionistas tienden a mejorar la calidad del suelo y la productividad de cultivos. Sin embargo, algunos estudios presentan resultados contradictorios en cuanto a la calidad física del suelo y la productividad, atribuibles a factores intrínsecos. Para entender mejor los impactos de las prácticas de labranza, es crucial realizar investigaciones a nivel nacional que consideren las exigencias edafoclimáticas de los diferentes cultivos, con el fin de identificar las condiciones en las que los sistemas conservacionistas resultan más eficientes para una agricultura más sustentable y resiliente.

ABSTRACT Tillage has been a fundamental pillar in the establishment and evolution of agriculture over time. However, its impact on soil quality and agricultural productivity has received significant attention due to environmental challenges and the need for sustainable agriculture. This study assessed the state of the art on tillage practices and their influence on soil quality and agricultural productivity over the last 20 years, through an analysis of 92 articles from the Web of Science database. The results reveal a growing interest in the topic in the last decade, with notable contributions from the United States, China, Brazil, Canada, and India, focusing on conservation systems and their relationship with soil quality, organic matter, and agricultural productivity. The most frequently evaluated indicators include physical parameters (bulk density, penetration resistance, aggregates, porosity), chemical parameters (nitrogen, phosphorus, potassium, pH), and biological parameters (organic carbon, microbial biomass, enzymatic activities). The review suggests that conservation tillage systems tend to improve soil quality and crop productivity. However, some studies present contradictory results regarding soil physical quality and productivity, attributable to intrinsic factors. To better understand the impacts of tillage practices, it is crucial to conduct national-level research that considers the edaphoclimatic requirements of different crops, in order to identify the conditions under which conservation systems are most efficient for more sustainable and resilient agriculture.

ABSTRACT Potassium (K) and B are important for phloem translocation, reproductive growth, and grain formation. A 2-yr field study was conducted to evaluate the effect of K and B applied through the soil and foliar application on sunflower (Helianthus annuus L.) Experiments included the soil application of K (62 kg ha-1) and B (5 kg ha-1) and foliar spray of K (1%) and B (0.1%). Furthermore, the soil-applied K and B was supplemented with three foliar sprays of either K, B, or both at 45, 60 and 75 d after sowing. The results revealed that K and B fertilization improved the agronomic parameters of sunflower, including plant height, head diameter, achenes per head, achene weight, yield, seed oil contents and oil quality. The soil applied K at 62 kg ha-1 followed by foliar spray of 1% K + 0.1% B at 45, 60 and 75 DAS resulted in production of taller plants (192 and 172 cm), head diameter (23 and 28 cm), achene per head (954 and 1063), 1000 achene weight (68 and 67.58 g), achene yield (2976 and 2621 kg ha-1), biological yield (11363 and 8430 kg ha-1), oil contents (43.37% and 41.87%), and oleic acid (70.33% and 80.83%) over 2 yr of study. Hence it can be concluded that soil application of 62 kg ha-1 K followed by foliar application of 1% K + 0.1% B is the preferable fertilization strategy for sunflower for improved yield, seed oil contents, and oil quality.