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 The cowpea is a legume that is widely grown in the north-east of Brazil, and which has been gaining ground in other regions of the country. The main producer is the state of Ceará, with a large planted-area, albeit low productivity due to a lack of producer technology and adapted cultivars. The aim of this study was to identify and recommend superior genotypes in terms of adaptability and stability under rainfed and irrigated conditions, in addition to genotypes with reduced grain darkening. To this end, six experiments were conducted in different districts of Ceará (Crato, Pentecoste, Crateús, Madalena, Bela Cruz and Limoeiro do Norte) and one laboratory experiment, to evaluate grain darkening. The experimental design of the field trials was of randomised blocks, with 14 genotypes and 4 replications. The analysis of variance showed a significant effect from the genotypes and environments and their interaction, so GGE Biplot analysis was carried out to evaluate adaptability and stability. To evaluate grain darkening, a completely randomised design was used in a simple factorial scheme with six previously selected genotypes and five different storage times (0, 2, 4, 6 and 8 months). There was a significant effect from the genotypes and storage time. Genotype 1 showed the least darkening, and can be recommended for environments to which it is best adapted (Crato and Crateús). Genotype 9 was considered the most stable for grain yield, and can be more broadly recommended for the semi-arid region of the state of Ceará. northeast north east Brazil country plantedarea, plantedarea planted area, area planted-area cultivars conditions darkening end Crato, Crato Pentecoste Crateús Madalena Norte experiment blocks replications interaction 0, 0 (0 2 months. months . months) time Crateús. Crateús) yield semiarid semi arid (

ABSTRACT The correct use of tyres on agricultural tractors, in respect of the terrain and the type and internal pressure of the tyre, are factors that influence the performance of the tractor. The aim of the present study was to evaluate the operating performance of an agricultural tractor fitted with two types of traction device (radial and diagonal tyres) at different pressures, and operating on soil with two levels of moisture. The experiment was conducted on a dystrophic Red Yellow Argisol, with tests to evaluate the performance of the tyres under specific working conditions. Tractive power and tractive force, wheel slip and fuel consumption were evaluated. For each of the conditions under evaluation, the radial configuration showed better performance than the diagonal configuration, the effect being more significant at the lower pressure and under low soil moisture. The use of radial tyres led to an increase in traction capacity and drawbar power, with a reduction in fuel consumption, especially at higher slip rates. tractors tyre pressures moisture Argisol force evaluated evaluation rates

ABSTRACT Cobalt (Co) and molybdenum (Mo) are essential elements with a fundamental role in biological nitrogen fixation in legumes. Vitamins such as thiamine, despite being required in small quantities, influence plant growth. This study aimed to assess the efficiency of different doses of thiamine applied as seed treatment, combined or not with Co and Mo, in enhancing the development of soybean crops. The experiment was conducted in a greenhouse according to a randomized block design with a 6 × 2 factorial arrangement, comprising six thiamine doses (0, 10, 25, 50, 100, and 200 mg kg-1) in the presence or absence of Co and Mo at the recommended rate of 100 mL ha-1. At 40 days after sowing, plants were analyzed for root length, root dry weight, shoot length, shoot dry weight, nodule number, and nodule dry weight. Principal component analysis showed that combined application of Co and Mo with thiamine was negatively associated with all variables and that the thiamine doses most positively associated with the analyzed variables were 50 and 200 mg kg-1. In treatments containing thiamine alone, there was a linear direct relationship between thiamine dose and nodule dry weight. Root and shoot lengths and dry weights were highest in plants treated with thiamine only at a dose of 122 mg kg-1. Application of Co and Mo combined with thiamine via seed treatment does not promote the development of soybean crops. Thiamine application is a promising treatment to increase shoot length, root dry weight, and nodule dry weight in soybean. (Co (Mo legumes quantities growth crops arrangement 0, 0 (0 10 25 20 kg1 kg 1 kg-1 ha1. ha1 ha 1. ha-1 4 sowing length number 5 kg1. alone 12 ( kg- ha-

ABSTRACT The development of aquaculture through the cultivation of what are considered unconventional species is an option with the potential to solve the problem of food scarcity. The aim of the present study was to evaluate the zootechnical performance of juvenile Pomacea haustrum fed different commercial diets, and subjected to different levels of salinity. After seven P. haustrum spawn had hatched in the laboratory, the juveniles were randomly selected and transferred to the rearing containers. Two different commercial diets were offered: rabbit feed with a high proportion of ingredients rich in crude vegetable protein (VP), and dog food containing balanced levels of ingredients rich in crude vegetable and animal protein (MP). The selected juveniles were randomly stocked at different salinities (0, 2 and 4 parts per thousand - ppt). The experiment lasted 65 days. Twenty-one hours after the start of the experiment, 100% of the individuals reared at a salinity of 4 ppt had died. There was a significant difference (p ≤ 0.05) between the results for zootechnical performance (average final weight, weight gain, average final growth, specific growth rate, protein efficiency and apparent feed conversion) for animals reared in fresh water or at a salinity of 2 ppt, regardless of the type of diet. The origin of the protein in the diet had no significant effect on the zootechnical performance of the individuals; however, the salinity of the water impaired development of the animals in direct proportion to its concentration. scarcity P laboratory containers offered VP, VP , (VP) MP. MP . (MP) 0, 0 (0 ppt. ppt) 6 days Twentyone Twenty one 100 died p 0.05 005 05 gain rate conversion however concentration (VP (MP ( 10 0.0 00 1 0.

RESUMO O pimentão, cultura de importância nutricional, destaca-se por seu valor de vitamina C. Diante da necessidade de práticas agrícolas sustentáveis, o estudo explorou o uso de biocarvões derivados de resíduos regionais como alternativa na cultura de pimentão. Nesse contexto, objetivou-se avaliar o efeito de biocarvões provenientes de cama de frango, fibra de coco e palha de arroz, nas características biométricas e físico-químicas de frutos de pimentão verde, na produção de frutos por planta e na produtividade. A pesquisa foi conduzida em campo no delineamento em blocos casualizados, em esquema fatorial 5 × 3 + 1, referentes a cinco doses de biocarvão (0, 3, 6, 9 e 12 t ha-1) e três tipos de biocarvão (fibra de coco, cama de aviário e palha de arroz) com quatro repetições, mais um tratamento adicional (adubação mineral). Foram avaliadas variáveis biométricas (comprimento e diâmetro dos frutos, espessura da casca, número de frutos, massa do fruto) e físico-químicas dos frutos (sólidos solúveis, acidez titulável, pH, vitamina C e teor de cinzas), produção e produtividade dos frutos. A produção de frutos de pimentão verde não foi influenciada pelos biocarvões, porém as doses de biocarvões influenciaram todas as variáveis analisadas com exceção da espessura da casca. Os teores de vitamina C e de sólidos solúveis foram maiores nos tratamentos com biocarvões e menores com adubação mineral. A maior influência na acidificação dos frutos foi com o biocarvão produzido com palha de arroz. nutricional destacase destaca se sustentáveis contexto objetivouse objetivou frango arroz físicoquímicas físico químicas casualizados 1 0, 0 (0 6 ha1 ha ha-1 repetições mineral . mineral) comprimento casca fruto titulável pH cinzas, cinzas , cinzas) ( ha-

ABSTRACT Bell pepper, a crop of nutritional importance, stands out for its vitamin C content. Given the need for sustainable agricultural practices, the present study explored the use of biochars derived from regional waste as an alternative in bell pepper cultivation. In this context, the present study aimed to evaluate the effect of biochars from poultry litter, coconut fiber, and rice straw on the biometric and physicochemical characteristics of bell pepper fruits, on fruit production per plant and on fruit yield. The experiment was performed in the field in a randomized block design, in a 5 × 3 + 1 factorial scheme, referring to five doses of biochar (0, 3, 6, 9, and 12 t ha-1) and three types of biochar (coconut fiber, poultry litter, and rice straw) with four repetitions, plus an additional treatment (mineral fertilization). Biometric variables (fruit length and diameter, skin thickness, number of fruits, fruit mass) and physicochemical variables of the fruits (soluble solids, titratable acidity, pH, vitamin C, and ash content), production and yield of the fruits were evaluated. The production of bell pepper fruits was not influenced by biochars, but the doses of biochars influenced all variables analyzed with the exception of skin thickness. Vitamin C and soluble solids contents were higher in treatments with biochar and lower with mineral fertilizer. Biochar produced from rice straw had the greatest influence on fruit acidification. importance content practices cultivation context litter fiber design scheme 0, 0 (0 6 9 ha1 ha ha-1 repetitions fertilization. fertilization . fertilization) diameter thickness mass acidity pH content, , content) evaluated fertilizer acidification ( ha-

RESUMO A introdução da soja tolerante a 2,4-D (ENLIST®) oferece um novo potencial para a aplicação de herbicidas. Dessa forma, o presente trabalho teve como objetivo: (a) avaliar o efeito das combinações de herbicidas pós-emergentes no controle de Conyza spp., e (b) a seletividade da associação de herbicidas pós-emergentes em soja, garantindo uma aplicação eficaz sem comprometer a saúde da cultura. Um experimento de campo com soja tolerante ao 2,4-D utilizou um delineamento experimental de blocos casualizados, com 14 tratamentos em quatro repetições. Os tratamentos incluíram várias combinações de 2,4-D com glifosato, chlorimuron, cloransulam, imazethapyr, bentazona e imazamox. Estes foram aplicados como um único tratamento ou sequencialmente 15 dias após o tratamento (DAT) usando glufosinato de amônio, juntamente com dois controles sem aplicação de herbicida. Os resultados mostraram menos de 15% de fitotoxicidade em todos os tratamentos. Aos 21 DAT, apenas os tratamentos aplicados sequencialmente mostraram controle significativo, com eficácia superior a 80% contra Conyza spp. Em contraste, as aplicações únicas das combinações de herbicidas com 2,4-D foram ineficazes para o controle pós-emergência de Conyza spp. 2,4D 24D D 2,4 2 4 ENLIST® ENLIST (ENLIST® forma objetivo (a pósemergentes pós emergentes spp b (b cultura casualizados 1 repetições glifosato chlorimuron cloransulam imazethapyr imazamox DAT (DAT amônio herbicida significativo 80 contraste pósemergência emergência 4D 24 2, (ENLIST 8

ABSTRACT The introduction of 2,4-D-tolerant soybeans (ENLIST®) offers a new potential for herbicide application. Therefore, the present study aimed to (a) evaluate the effect of combinations of post-emergent herbicides on the control of Conyza spp. and (b) assess the selectivity of the post-emergent herbicide association in soybeans, ensuring effective application without compromising the health of the crop. A field experiment with 2,4-D-tolerant soybeans utilized a randomized complete block design with 14 treatments across four replications. Treatments included various combinations of 2,4-D with glyphosate, chlorimuron-ethyl, cloransulam-methyl, imazethapyr, bentazon, and imazamox. These were applied either as a single treatment or sequentially 15 days after treatment (DAT) using glufosinate-ammonium alongside two controls without herbicide application. The results showed less than 15% control across all treatments. At 21 DAT, only the treatments applied sequentially showed significant control, with effectiveness exceeding 80% against Conyza spp. In contrast, the single applications of the herbicide combinations with 2,4-D were ineffective for post-emergence control of Conyza spp. 2,4Dtolerant 24Dtolerant Dtolerant 2,4 D tolerant 2 4 ENLIST® ENLIST (ENLIST® Therefore (a postemergent post emergent spp b (b crop 1 replications 2,4D 24D glyphosate chlorimuronethyl, chlorimuronethyl chlorimuron ethyl, ethyl chlorimuron-ethyl cloransulammethyl, cloransulammethyl cloransulam methyl, methyl cloransulam-methyl imazethapyr bentazon imazamox DAT (DAT glufosinateammonium glufosinate ammonium 80 contrast postemergence emergence 4Dtolerant 24 2, (ENLIST 4D 8

ABSTRACT: This study evaluated the effect of removing apical dominance at phenological stages on the agronomic traits of soybean cultivars. The experiment was conducted in the 2020/2021 growing season inthe teaching-experimental area of the Federal Institute of Education, Science and Technology of Rio Grande do Sul, Campus Ibirubá, under a randomized block design in a split-plot arrangement, with three replications. The main plots were composed of five soybean cultivars (DM53i54 IPRO, Zeus IPRO, Lanza IPRO, DM5958 IPRO, and Delta IPRO), and the subplots consisted of the phenological stages of apical dominance removal (control, V2, V4, and V6). Morphological traits were evaluated at different stages. Differences were observed between cultivars, which followed their pre-defined morphologies. Apical dominance removal reduced aspects such as the number of nodes and legumes on the main stem and the first legumeinsertion height. Cultivars developed branching mechanismsas a compensation strategy, increasing the number of legumes on the branches by up to 130%. The removal of the shoot apex can modify morphological aspects in soybean plants,but their yield tends to be maintained. ABSTRACT 20202021 2020 2021 2020/202 teachingexperimental teaching experimental Education Sul Ibirubá splitplot split plot arrangement replications DM53i54 DMi DM i (DM53i5 IPRO DM595 , IPRO) control, control (control V2 V V4 V6. V6 . V6) predefined pre defined morphologies height strategy 130 130% plantsbut plants but maintained 2020202 202 2020/20 DM53i5 (DM53i DM59 13 202020 20 2020/2 DM53i DM5 1 20202 2 2020/

RESUMO: O presente artigo objetiva avaliar o efeito da remoção da dominância apical em estádios fenológicos, nos caracteres agronômicos de cultivares de soja. O experimento foi implantado na área didática-experimental do Instituto Federal de Educação e Tecnologia do Rio Grande do Sul, Campus Ibirubá, na safra 2020/2021, sob delineamento de blocos ao acaso, em arranjo de parcelas subdivididas, com três repetições. As parcelas principais eram compostas pelos cinco cultivares (DM53i54 IPRO, Zeus IPRO, Lança IPRO, DM5958 IPRO e Delta IPRO) e as subparcelas, pelos estádios fenológicos de remoção de dominância apical (testemunha, V2, V4 e V6). As características morfológicas foram avaliadas em diferentes estádios. Como resultados, verificaram-se diferenças entre os cultivares, que seguiram suas morfologias pré-definidas. A remoção de dominância apical, reduziu aspectos como o número de nós e legumes na haste principal, além da altura de inserção do primeiro legume. Como estratégia de compensação, os cultivares desenvolvem mecanismos de ramificação, acrescendo até 130% no número de legumes nos ramos. Verifica-se que a remoção do ápice caulinar é capaz de modificar aspectos morfológicos em plantas de soja, contudo, seu rendimento tende a ser mantido. RESUMO soja didáticaexperimental didática experimental Sul Ibirubá 20202021 2020 2021 2020/2021 acaso subdivididas repetições DM53i54 DMi DM i (DM53i5 DM595 subparcelas testemunha, testemunha (testemunha V2 V V6. V6 . V6) resultados verificaramse verificaram se prédefinidas. prédefinidas pré definidas. definidas pré-definidas principal legume compensação ramificação 130 ramos Verificase Verifica contudo mantido 2020202 202 2020/202 DM53i5 (DM53i DM59 13 202020 20 2020/20 DM53i DM5 1 20202 2 2020/2 2020/

In the water/triethanolamine/ethanol system, TiCl4 aqueous solution is used as the precursor to regulate the conversion rate of TiCl4 by changing the reaction temperature, water volume, pH value, and ethanol amount. The experiment uses a single-factor method to investigate the dynamic relationship between Ti4+ concentration and time under various factors, thereby achieving controllable TiO2 production. The experimental results showed that under a single factor, the conversion rate showed a trend of first steep and then slow growth within 180 min. After 180 min, the conversion rate tended to stabilize. Considering various factors, it was found that VTiCl4:VC6H15NO3:VH2O:VC2H5OH = 1:6:15:30, pH = 7, reaction time at room temperature was 4 h, and the hydrolysis effect was good. The final conversion rate was 90.46%, and the hydrolysis reaction conforms to the first-order reaction equation. Kinetic parameters: pre-factor (A) = 0.107, activation energy (Ea) = 4488.65 J mol-1. watertriethanolamineethanol triethanolamine system TiCl volume value amount singlefactor factor Ti4 Ti factors TiO production 18 min stabilize VTiCl4VC6H15NO3VH2OVC2H5OH VTiClVCHNOVHOVCHOH VTiCl4 VC6H15NO3 VH2O VC2H5OH VTiCl VC H NO VH O OH 161530, 161530 1 6 15 30, 30 1:6:15:30 7 h good 9046 90 46 90.46% firstorder order equation parameters prefactor pre A (A 0107 0 107 0.107 Ea (Ea 448865 4488 65 4488.6 mol1. mol1 mol 1. mol-1 OVC VCHNO VC6H15NO VHO VCHOH 16153 3 1:6:15:3 904 9 90.46 010 10 0.10 44886 448 4488. mol- 1615 1:6:15: 90.4 01 0.1 44 161 1:6:15 90. 0. 16 1:6:1 1:6: 1:6 1:

ABSTRACT There is great interest in varieties with greater competitive ability against weeds. This can be facilitated by path analysis, which involves the statistical evaluation and interpretation of the relationship between yield and its components. In this analysis, the occurrence of multicollinearity results in inconsistent estimates of the coefficients, and overestimates of the direct effects of the explanatory variables on the response variable. The aim of this study was to identify the characteristics with the greatest direct effect on pod yield and green and dry bean yields in traditional cowpea varieties, evaluated in competition with weeds in two experiments. In addition, the presence of multicollinearity was investigated in the analyses. In Experiment-1, twelve varieties with the highest bean yields in a preliminary evaluation were assessed in a randomized block design with five replications. In Experiment-2, six varieties, selected in the preliminary evaluation, were assessed using two methods of weed management: three of the most productive and three of the least productive. Randomized blocks and split plots were used, with five replications. Multicollinearity, indicated by the number of conditions and the variance inflation values, was greater in Experiment-2. In the six cases under study (three yields x two experiments), the number of pods per plant had the greatest direct effect on yield. analysis components coefficients variable experiments addition analyses Experiment1, Experiment1 Experiment 1, 1 Experiment-1 replications Experiment2, Experiment2 2, 2 Experiment-2 management used Multicollinearity values Experiment2. 2. experiments, , experiments) Experiment-

ABSTRACT Chia (Salvia hispanica L.) seeds have attracted great economic interest for their high levels of linoleic and α-linolenic acids. In Brazil, there is a lack of studies on the agronomic characteristics and physiological quality of chia, necessitating research on germination processes and strategies to enhance yield under field conditions. There are no studies assessing the development of seeds with different coat colors in the presence of fungicides. This study aimed to assess the physiological quality of chia seeds as a function of coat color and fungicide treatment. The experiment followed a completely randomized design with a 2 × 2 factorial arrangement and six replications. For this, seeds were divided into two groups according to coat color (black and white) and subjected or not to treatment with carboxin + thiram. Germination speed index, germination rate, and shoot length were evaluated in plants sown at 0, 90, and 180 days after seed treatment. Germination rate and speed index differed significantly between coat colors, with white seeds having higher vigor than black seeds. Shoot length, however, differed only for seeds sown on the day of treatment, indicating that treated seeds were more vigorous. Salvia L. L αlinolenic α linolenic acids Brazil conditions fungicides replications this thiram 0 90 18 however vigorous 9 1

ABSTRACT Given the large differences in the results of inoculation and co-inoculation in the bean crop, an experiment in cultivating winter beans was carried out in 2019 under greenhouse conditions with the aim of evaluating the performance of the beans and a possible increase in plant growth and grain production, using seeds inoculated or co-inoculated with Rhizobium tropici and Azospirillum brasilense, with and without fungicide and/or insecticide, in sandy and clayey soils. A total of 112 pots were used, and 14 treatments were applied in a completely randomised experimental design, with four replications. The Scott-Knott test was used to analyse the results, and showed that whether using untreated seeds or carrying out complete chemical treatment with fungicide and insecticide plus co-inoculation with R. tropici and A. brasilense, winter bean production was reduced in clayey soil, while the joint use of fungicide and insecticide, fungicide and R. tropici, or fungicide, insecticide and R. tropici, favoured shoot development. Inoculating with A. brasilense, without R. tropici and with insecticide, or insecticide and fungicide, favoured greater root growth in clayey soil. In sandy soil, grain production was higher using seeds treated solely with insecticide, solely with R. tropici, or with a combination of both. Production was lower in the joint treatment with fungicide, insecticide and the co-inoculation of bacteria, or when using insecticide together with A. brasilense. coinoculation co crop 201 coinoculated brasilense andor soils 11 1 design replications ScottKnott Scott Knott R soil development both bacteria 20 2

RESUMO: O objetivo deste trabalho foi desenvolver uma estratégia de seleção e obter progênies de aveia branca precoces, homogêneas para o florescimento e com acréscimos a massa de grãos da panícula, conciliados aos estímulos ambientais controlados pela temperatura do ar. O experimento foi conduzido no município de Augusto Pestana, no estado do Rio Grande do Sul, Brasil. O delineamento experimental de blocos aumentados com testemunha intercalar, os tratamentos regulares correspondem a 238 progênies de aveia branca e o tratamento comum foi representado pela testemunha comercial (URS Taura) disposta em três repetições. A seleção para peso de grãos por panícula, porcentagem de plantas floridas, dias para maturidade fisiológica e acúmulo de graus-dia devem-se a uma alta contribuição genética, o que indica uma seleção promissora para esses caracteres já nas gerações iniciais de melhoramento. O acúmulo de graus dias para a maturidade fisiológica define que 41,94% das progênies são selecionadas como precoces. O índice de distância genótipo ideótipo (MGIDI) selecionou 20% das progênies da aveia branca com maior uniformidade do florescimento, menor acúmulo de graus dias e alto potencial de massa de grãos por panícula. RESUMO precoces panícula ar Pestana Sul Brasil intercalar 23 URS Taura repetições floridas grausdia dia devemse devem se genética melhoramento 4194 41 94 41,94 MGIDI (MGIDI 20 2 419 4 9 41,9 41,

ABSTRACT: The development of a selection strategy and to obtain a precocious white oat progenies, homogeneous for flowering and with additions to panicle grain mass, reconciled to environmental stimuli controlled by air temperature. The experiment was conducted in the municipality of Augusto Pestana, in the state of Rio Grande do Sul, Brazil. The experimental design was in augmented blocks with intermediate control, the regular treatments corresponded to 238 white oat progenies and the common treatment was represented by the commercial control (URS Taura) arranged in three replications. The selection for grains weight per panicle, percentage of flowered plants, days to physiological maturity and accumulation of degrees day are due to a high genetic contribution, which indicated promising selection for these characters already in initial breeding generations. The accumulation of degrees days for physiological maturity defines that 41.94% of the progenies are selected as precocious. The genotype ideotype distance index (MGIDI) selected 20% of the white oat progenies with greater flowering uniformity, less accumulation of degrees days and high potential for grain mass per panicle. ABSTRACT temperature Pestana Sul Brazil 23 URS Taura replications plants contribution generations 4194 41 94 41.94 MGIDI (MGIDI 20 uniformity 2 419 4 9 41.9 41.

RESUMO No clima semiárido, o crescimento de mudas frutíferas é desafiado pelo estresse hídrico característico da região, o que pode restringir seu desenvolvimento e, consequentemente, afetar a produção. Nesse contexto, o objetivo foi avaliar o efeito do extrato pirolenhoso nas características de troca gasosa, pigmentos fotossintéticos, crescimento e biomassa de pitangueira sob diferentes intensidades de déficit hídrico. O experimento foi conduzido em casa de vegetação utilizando um delineamento em blocos casualizados em um esquema fatorial 3 × 2, com quatro repetições, correspondendo a períodos de déficit hídrico foram de 7 e 14 dias, além do controle (irrigação diária), no substrato sem e com extrato pirolenhoso. As plantas foram avaliadas quanto às características de trocas gasosas foliares, índices de clorofila, crescimento e biomassa seca. A aplicação de extrato pirolenhoso aos 7 dias de déficit hídrico elevou a taxa fotossintética, a eficiência de carboxilação e o índice de qualidade de Dickson das mudas de pitanga em 40,04, 42,85 e 41,51%, respectivamente, em comparação aos 14 dias de déficit hídrico. O extrato pirolenhoso foi efetivo como um atenuante do estresse hídrico nas mudas de pitanga, especialmente durante os primeiros sete dias de exposição ao estresse. Assim, sua aplicação é recomendada como uma medida preventiva e de curto prazo para mitigar tais efeitos nas mudas de pitanga. semiárido região consequentemente produção contexto gasosa fotossintéticos 2 repetições 1 irrigação diária, diária , diária) foliares clorofila seca fotossintética 4004 40 04 40,04 4285 42 85 42,8 4151 41 51 41,51% respectivamente Assim 400 4 0 40,0 428 8 42, 415 5 41,51 40, 41,5 41,

ABSTRACT In the semi-arid climate, the growth of fruit seedlings is challenged by the water stress characteristic of the region, which can restrict their development and, consequently, affect production. In this context, the aim was to assess the effect of pyroligneous extract on gas exchange characteristics, photosynthetic pigments, growth, and biomass of pitanga under different intensities of water deficit. The experiment was conducted using a randomized block design in a 3 × 2 factorial scheme, with four replicates, corresponding to water deficit periods (7 and 14 days) and control (daily irrigation), in substrates with and without pyroligneous extract. The plants were evaluated for gas exchange characteristics, chlorophyll indices, growth, and dry biomass. Application of pyroligneous extract after 7 days of water deficit increased the photosynthetic rate, carboxylation efficiency and Dickson quality index of pitanga seedlings by 40.04, 42.85 and 41.51%, respectively, compared to 14 days of water deficit. Pyroligneous extract was effective as a water stress attenuator in pitanga seedlings, especially during the first seven days of exposure to stress. Therefore, its application is recommended as a preventive and short-term measure to mitigate such effects on pitanga seedlings. semiarid semi arid climate region consequently production context characteristics pigments scheme replicates ( 1 daily irrigation, irrigation , irrigation) indices rate 4004 40 04 40.04 4285 42 85 42.8 4151 41 51 41.51% respectively Therefore shortterm short term 400 4 0 40.0 428 8 42. 415 5 41.51 40. 41.5 41.

ABSTRACT The aim of this study was to characterise the lignocellulosic fractions of pruning waste from tree species showing potential for furniture production in Acaraú, Ceará. The experiment was conducted in a completely randomised, split-plot design, with the plots corresponding to two water regimes (irrigated for one year and irrigated for three years) and the sub-plots to eight tree species, with three replications. The chemical attributes were determined after seven years. Except for the insoluble lignin content, there was a significant effect from the different species in terms of the chemical properties of the wood. The results for the lignocellulosic fractions show the possibility of developing technological ways of adding value to these waste products, especially considering their lignin content. The different species also showed potential for use in producing cellulose pulp, with the exception of Handroanthus impetiginosus due to its high ash content. The results of this study offer new perspectives for future research into the use of forestry waste. Acaraú Ceará randomised splitplot split plot design years subplots sub replications content wood products pulp