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Abstract The aim of this study was to evaluate the effect of substituting virginiamycin with yeastbased products in high-energy diets containing monensin on the nutrient digestibility and ruminal parameters of cattle. Five crossbred Nellore × Holstein steers (initial body weight 281 kg ± 9.2 kg) were allotted to a 5 × 5 Latin square design. The diets were composed in dry matter basis of corn silage (355 g kg-1), and concentrate composed of ground corn, soybean meal, soybean hulls,mineral mix, limestone, salt and urea (645 g kg-1). The treatments were: 1 - control, 18 mg kg-1 dry matter (DM) virginiamycin (VM); 2 - enriched yeast culture (Saccharomyces cerevisiae) at 7 g animal day-1 (EYC 7); 3 - enriched yeast culture (S. cerevisiae) at 14 g animal day-1 (EYC 14); 4 - autolyzed yeast (S. cerevisiae) at 7 g animal day-1 (AY 7); and 5 - autolyzed yeast (S. cerevisiae) at 14 g animal day-1 (AY 14). Monensin (18 mg kg-1 DM) was added to the mineral mix in all treatments. No significant differences (P > 0.05) were found for DM intake (mean 8.36 kg DM), organic matter (OM) digestibility (average of 58.39%), or mean ruminal pH (mean 6.75) among treatments. Moreover, the treatment did not have a significant effect on the short-chain fatty acid or ammonia nitrogen concentrations. These results indicated the possibility of replacing virginiamycin with yeast-based products at the lowest level (7 g of enriched yeast culture or autolyzed yeast per animal day-1) in high-energy diets containing monensin. highenergy high energy cattle initial 28 92 9 9. design 355 (35 kg1, kg1 , kg-1) meal hullsmineral hulls limestone 645 (64 kg1. . control kg- (DM VM (VM) Saccharomyces cerevisiae day1 day day- EYC 7) S. S (S 14) AY 14. (1 P 0.05 005 0 05 836 8 36 8.3 DM, OM (OM average 58.39%, 5839 58.39% 58 39 58.39%) 6.75 675 6 75 Moreover shortchain short chain concentrations based ( 35 (3 64 (6 (VM 0.0 00 83 8. 583 58.39 6.7 67 0. 58.3 6. 58.

Resumo O objetivo do estudo foi avaliar a substituição de virginiamicina por produtos à base de levedura em dietas de alto grão contendo monensina, sobre a digestibilidade dos nutrientes e parâmetros ruminais. Cinco novilhos cruzados Nelore x Holandês (peso inicial 281 kg ± 9,2 kg) distribuídos em um delineamento Quadrado Latino 5 x 5. As dietas foram compostas por silagem de milho (355 g kg-1) e concentrado composto por: milho moído, farelo de soja, casca de soja, mistura mineral, calcário, sal e ureia (645 g kg-1). Os tratamentos foram: 1. Controle, 18 mg kg-1 MS de virginiamicina (VM); 2. Cultura de levedura enriquecida (Saccharomyces cerevisiae) 7g animal dia-1 (CLE 7); 3. Cultura de levedura enriquecida (Saccharomyces cerevisiae) 14g animal dia-1 (CLE 14); 4. Levedura autolisada (Saccharomyces cerevisiae) 7g animal dia-1 (LA 7) e Levedura autolisada (Saccharomyces cerevisiae) 14g animal dia-1 (LA 14). A monensina (18 mg kg-1 MS) estava presente na mistura mineral vitamínica fornecida em todos tratamentos. Não houve diferença significativa (P>0,05) para o consumo de matéria seca (média 8,36 kg MS); digestibilidade da matéria orgânica (média 58,39%) e média de pH ruminal (média 6,75). Além disso, não foram encontrados efeitos significativos de tratamentos para concentração de ácidos graxos de cadeia curta e nitrogênio amoniacal. Estes resultados indicam a possibilidade de substituir a virginiamicina por produtos à base de levedura nos menores níveis (7g animal dia-1 de cultura de levedura enriquecida ou 7g animal dia-1 de levedura autolisada) em dietas de alto grão com monensina. ruminais peso 28 92 9 2 9, 355 (35 kg1 1 moído soja calcário 645 (64 kg1. . Controle kg- VM (VM) Saccharomyces cerevisiae dia1 dia dia- CLE 7 3 14 14) 4 LA 14. (1 P>0,05 P005 P 0 05 (P>0,05 836 8 36 8,3 58,39% 5839 58 39 6,75. 675 6,75 6 75 6,75) disso amoniacal 35 (3 64 (6 (VM ( P>0,0 P00 (P>0,0 83 8, 58,39 583 67 6,7 P>0, P0 (P>0, 58,3 6, P>0 (P>0 58, P> (P> (P

https://doi.org/10.1590/1809-6891v25e-77845e

ORBITAL REMOTE SENSING FOR THE MANAGEMENT OF AREAS IRRIGATED WITH A CENTRAL PIVOT SYSTEM
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Moreira, Wendel K. O.

; Maggi, Marcio F.

; Venancio, Luan P.

; Bazzi, Claudio L.

; Santos, Igor S.

Engenharia Agrícola

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2023, Volume 43 Nº 1 elocation e20220109

Resumo: En | Texto: En | PDF: En

ABSTRACT Irrigated agriculture is considered one of the most important techniques for agricultural production in the world, despite being the sector that uses water resources the most. Thus, technological advances have been constantly developed and applied in the sector as a way to improve water management and reduce its consumption, considering that some cultures are affected by economic costs and feasibilities of production, because the water cost has increased significantly in recent years. Remote sensing is a technology that has provided good results for estimating evapotranspiration (ETr) in producing areas, enabling more efficient irrigation management for low costs. This study aimed to answer the question about how the generation of irrigation management zones (IMZs) can be used to optimize water use and improve irrigation systems and which ETr models are better for it. Three ETr estimation models (Surface Energy Balance Algorithm for Land [SEBAL], Mapping Evapotranspiration at High Resolution and with Internalized Calibration [METRIC] and Simple Algorithm for Evapotranspiration Retrieving [SAFER]) were used to design IMZs in center pivot cultivated with cotton. The design of IMZs with ETr data proved to be a viable alternative, making it possible to improve water management in irrigated systems, reducing costs with viability irrigation for cotton and others cultures. The METRIC method displayed the greatest ease in obtaining the data used in the ETr estimation for generating the IMZs.

https://doi.org/10.1590/1809-4430-eng.agric.v43n1e20220109/2023

Multidisciplinary Scientific Cruises for Environmental Characterization in the Santos Basin – Methods and Sampling Design
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Moreira, Daniel L.

; Dalto, Adriana G.

; Figueiredo JR, Alberto G.

; Valerio, Aline M.

; Detoni, Amalia M. S.

; Bonecker, Ana C. T.

; Signori, Camila N.

; Namiki, Cláudia

; Sasaki, Dalton K.

; Pupo, Daniel V.

; Silva, Danilo A.

; Kutner, Deborah S.

; Duque-Castaño, Diana C.

; Marcon, Eduardo H.

; Gallotta, Fabiana D. C.

; Paula, Fabiana S.

; Gallucci, Fabiane

; Roque, Gabriela C. F.

; Campos, Giulia S.

; Fonseca, Gustavo

; Mattos, Gustavo

; Lavrado, Helena P.

; Silveira, Ilson C. A. da

; Costa, Jessica O.

; Santos Filho, João R. dos

; Carneiro, Juliane C.

; Moreira, Julio C.F.

; Rozo, Laura

; Araujo, Leandro F.M.

; Lazzari, Letícia

; Silva, Letícia O. da

; Michelazzo, Luan S.

; Fernandes, Luciano F.

; Dottori, Marcelo

; Araújo Jr., Marcus A. G. de

; Chuqui, Mateus G.

; Ceccopieri, Milena

; Borges-Silva, Milton

; Kampel, Milton

; Bergo, Natascha M.

; Silva, Paulo V. M.

; Tura, Pedro M.

; Moura, Rafael B. de

; Romano, Renato G.

; Martins, Renato P.

; Carreira, Renato S.

; Toledo, Rodrigo G.A.

; Bonecker, Sérgio L.C.

; Disaró, Sibelle T.

; Rodrigues, Silvana V.

; Corbisier, Thais N.

; Vicente, Thaisa M.

; Paiva, Vitor G. de

; Pellizari, Vivian H.

; Belo, Wellington C.

; Brandini, Frederico P.

; Sousa, Silvia H.M

Ocean and Coastal Research

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2023, Volume 71 Supl. 3 elocation e23022

Resumo: En | Texto: En | PDF: En

Abstract The Santos Basin (SB) is the main petroliferous basin in the Brazilian continental margin and one of the most studied marine areas in Brazil. However, historical data suggest that new efforts should be carried out to acquire quantitative biological data, especially in the deep sea, to establish the baseline of essential ocean variables in different ecosystems for future monitoring programs. The Brazilian energy company Petrobras planned and executed 24 oceanographic cruises over a period of 2 years to assess the benthic (SANSED cruise) and pelagic (SANAGU cruise) systems of the SB (356 days at sea in 2019 and 2021/2022). These efforts were part of the Santos Project, which comprised a comprehensive environmental study aimed at investigating benthic and pelagic variables to characterize ecology, biogeochemistry, thermohaline properties of water masses, and ocean circulation patterns, geomorphology, and sedimentology, as well as organic and inorganic chemistry. Here we present the detailed sampling designs and the field methods employed on board, during the SB scientific cruises. All sampling protocols were based on standardized approaches. For the benthos analyses, triplicate sediment samples were performed using a GOMEX-type box corer (0.25 m²) or a large modified Van Veen grab (0.75 m²) at 100 stations ranging from 25 to 2400 m depth. At each station, 25 geochemical and physico-chemical parameters were analyzed in addition to micro-, meio-, and macrofauna and living foraminifera samples. For the pelagic system, 60 stations were selected to investigate the plankton community, ranging in size from pico- to macroplankton, through vertical, horizontal, and oblique net hauls (20, 200, and 500 μm mesh size), as well as 25 biogeochemical parameters collected with an aid of a CTD-rosette sampler. Part of this scientific information also serves the Regional Environmental Characterization Project (PCR-BS) in support of Petrobras’ Santos Basin drilling licensing process led by the Brazilian Environmental Agency – IBAMA. This project contributes to the sustainable development of the SB, in line with the guidelines of the United Nations Decade of Ocean Science for Sustainable Development. (SB Brazil However programs SANSED cruise SANAGU 356 (35 201 2021/2022. 20212022 2021/2022 . 2021 2022 2021/2022) ecology biogeochemistry masses patterns geomorphology sedimentology chemistry board approaches analyses GOMEXtype GOMEX type 0.25 025 0 (0.2 m² 0.75 075 75 (0.7 10 240 depth station physicochemical physico chemical micro, micro , micro- meio, meio meio- system 6 community pico macroplankton vertical horizontal 20, 20 (20 200 50 size, size) CTDrosette CTD rosette sampler PCRBS PCR BS (PCR-BS IBAMA Development 35 (3 2021202 2021/202 202 0.2 02 (0. 0.7 07 7 1 (2 5 3 ( 202120 2021/20 0. (0 20212 2021/2 2021/

https://doi.org/10.1590/2675-2824071.22072dlm

Structure of the ichthyoplankton community in a Neotropical floodplain lake affected by environmental degradation
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OLIVEIRA, LUCAS S. DE

; CAJADO, RUINERIS A.

; SANTOS, LUAN R.B. DOS

; ZACARDI, DIEGO M.

Anais da Academia Brasileira de Ciências

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2022, Volume 94 Nº 1 elocation e20201598

Resumo: En | Texto: En | PDF: En

Abstract Many Amazonian fish’ reproduction is associated to seasonality and to the conditions of habitat integrity. In a Neotropical floodplain lake of the Amazon region, the temporal structure of ichthyoplankton was investigated and the hypothesis that the density of fish eggs and larvae and the diversity of species vary between two areas with different levels of environmental changes occurred was tested. The sampling occurred monthly between September 2017 and August 2018. Six sampling stations were used, distributed in locations close to and far from the altered area. 195 eggs and 1,785 larvae from nine orders and 27 species were captured. The eggs were from non-migratory fish species and occurred during two moments. The larvae presented different abundance peaks during the sample months and all the initial stages of development occurred. Clupeiformes was the most abundant and Characiformes the species richest. The density of the ichthyoplankton and the diversity of species presented temporal variation. However, only the larval density varied between the areas of the lake. The Lake Juá is a spawning area for resident fish and is a nursery and growth area for larvae of species with different ecological categories and socioeconomic importance during different periods of the year.

https://doi.org/10.1590/0001-3765202220201598

Crop coefficient and water requirement of prickly pear in the Agreste region of Alagoas state, Brazil
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Divincula, Jesiele S.

; Silva, Cinara B. da

; Santos, Marcio A. L. dos

; Santos, Daniella P. dos

; Santos, Luan W. dos

Revista Brasileira de Engenharia Agrícola e Ambiental

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Dez 2019, Volume 23 Nº 12 Páginas 925 - 929

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

RESUMO O cultivo da palma forrageira tem exercido papel importante na pecuária brasileira, sendo utilizada como forragem para os animais na região Nordeste, especialmente na época de escassez de chuvas, por ser uma excelente fonte de água. Deste modo, objetivou-se com o esse trabalho estimar o coeficiente de cultivo e a necessidade hídrica da palma forrageira no agreste de Alagoas. A evapotranspiração da cultura (ETc) da palma forrageira foi determinada utilizando cinco lisímetros de drenagem, construídos de material polietileno com dimensões de 0,35 x 0,40 m (lado e profundidade). Foram separadas quatro camadas do solo, sendo colocadas nos lisímetros de maneira inversa, a fim de manter o mais próximo da estrutura inicial do solo. Já a evapotranspiração de referência (ETo) foi estimada pelos métodos de Penman-Monteith, Hargreaves-Samani e FAO-Radiação, utilizando dados climáticos da estação meteorológica do Instituto Nacional de Meteorologia (INMET) da cidade de Arapiraca, AL, Brazil. O coeficiente de cultivo (kc) foi calculado pela razão entre a ETc e a ETo. O kc médio obtido foi de 0,72; 0,84 e 0,48 para os métodos de Penman-Monteith, Hargreaves-Samani e FAO-Radiação, respectivamente. Mantendo o solo sob capacidade de campo durante todo período experimental, a evapotranspiração total da cultura foi de 637,84 mm, com valor diário de 4,22 mm dia-1.

ABSTRACT Prickly pear cultivation has played an important role in the Brazilian livestock farming, being used as forage for animals in the Northeast region, especially during the drying season, because it is an excellent source of water. Thus, the objective of this study was to estimate the crop coefficient and water requirement of prickly pear in the Agreste region of Alagoas state, Brazil. Prickly pear crop evapotranspiration (ETc) was determined using five drainage lysimeters, made of polyethylene with dimensions of 0.35 x 0.40 m (side and depth). Four soil layers were separated and put into the lysimeters in the opposite sequence, in order to maintain it as close as possible to the initial soil structure. The reference evapotranspiration (ETo) was estimated by the Penman-Monteith, Hargreaves-Samani and FAO-Radiation methods, using climatic data from the meteorological station of the Instituto Nacional de Meteorologia (INMET) in the city of Arapiraca, AL, Brazil. Crop coefficient (kc) was calculated by the ratio between ETc and ETo. The average kc obtained was 0.72, 0.84 and 0.48 for the Penman-Monteith, Hargreaves-Samani and FAO-Radiation methods, respectively. Keeping the soil under field capacity during the experimental period, the total crop evapotranspiration was 637.84 mm, with daily value equal to 4.22 mm d-1.

https://doi.org/10.1590/1807-1929/agriambi.v23n12p925-929 628 downloads

Timing carbon turnover (δ13C) in weaned piglet’s brain by IRMS
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SALEH, MAYRA A.D.

; SANTOS, LUAN S. DOS

; BERTO, DIRLEI A.

; AMORIM, ALESSANDRO B.

; COSTA, VLADIMIR E.

; DUCATTI, CARLOS

Anais da Academia Brasileira de Ciências

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Ago 2018, Volume 90 Nº 2 Páginas 2469 - 2478

Resumo: En | Texto: En | PDF: En

Abstract Isotope-ratio mass spectrometry (IRMS) is a potential tool that provides time-integrated estimate of assimilated and not just ingested nutrients. This feature turned possible its application to evaluate the effects of dietary nucleotides and glutamate on carbon turnover (δ13C) in the brain of weanling piglets. Eighty-seven piglets weaned at 21-day-old were used, being three piglets slaughtered at day-0 (prior to diet-switch) and, the remaining 84 randomly assigned in a complete block design with a 2 x 2 factorial arrangement of treatments (two nucleotide levels: 0% and 0.1% and, two glutamate levels: 0% and 1%). On trial days 3, 6, 9, 14, 21, 35 and 49, three piglets per treatment were also slaughtered. The samples were analyzed by IRMS and adjusted to the first-order equation by a nonlinear regression analysis using NLIN procedure of SAS, in order to obtain the exponential graphics. The carbon turnover (t95%) verified for cerebral tissue was faster (P<0.05) for diet containing glutamate in comparison to other diets, supporting the fact that glutamate contributed to develop the piglets’ brain, due to the fastest incorporation of 13C-atoms in this tissue at post-weaning phase, despite the energy deficit experienced by them.

https://doi.org/10.1590/0001-3765201820170861 716 downloads

Biostimulants on mineral nutrition and fiber quality of cotton crop
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Silva, Ricardo de A.

; Santos, Jerffson L.

; Oliveira, Luan S.

; Soares, Mauricio R. S.

; Santos, Saad M. S. dos

Revista Brasileira de Engenharia Agrícola e Ambiental

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Dez 2016, Volume 20 Nº 12 Páginas 1062 - 1066

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

RESUMO Os bioestimulantes são usados na cultura do algodão (Gossypium hirsutum L.) para equilibrar o crescimento vegetativo e reprodutivo e aumentar o rendimento de algodão em caroço e qualidade da fibra. Assim, com objetivo de estudar a eficiência do tratamento de sementes com bioestimulantes na nutrição, na produção e na qualidade tecnológica da fibra do algodoeiro, foi instalado um experimento de campo. O estudo foi realizado no campo de pesquisas da Fazenda Alvorada localizada no município de Luís Eduardo Magalhães, BA. O experimento foi conduzido em delineamento em blocos casualizados com quatro repetições e cinco tratamentos (testemunha, sem aplicação, Booster®, Stimulate®, Improver® e Biozyme®). Foram avaliados os teores de macro e micronutrientes foliares, produtividade e qualidade tecnológica da fibra. Os resultados mostraram que a aplicação dos bioestimulantes via semente incrementou os teores de N, K, S e Fe na parte aérea do algodoeiro mas não influenciou na produtividade; no entanto, verificaram-se alterações nas características tecnológicas da fibra em relação à uniformidade de comprimento, resistência à ruptura, índice de micronaire e comprimento da fibra.

ABSTRACT Biostimulants are used in cotton (Gossypium hirsutum L.) to balance vegetative and reproductive growth as well as to increase cotton seed yield and fiber quality. Therefore, in order to study the efficiency of seed treatment with biostimulants, nutrition, production and technological quality for the cotton fiber, a field experiment was installed. The study was conducted at the Alvorada farm research field, in Luis Eduardo Magalhães municipality - BA. The experiment was arranged in a completely randomized block design with four replicates and five treatments (control group, untreated group, Booster®, Stimulate®, Improver® and Biozyme®). Leaf contents of nutrients, yield and technological quality of the fiber were evaluated. The results showed that application of biostimulants in the seeds increased the N, K, S and Fe contents in the cotton leaf, but there was no influence on the crop yield. However, these products caused changes in the fiber characteristics, related to length uniformity, micronaire, length and strength of the fiber.

https://doi.org/10.1590/1807-1929/agriambi.v20n12p1062-1066 1949 downloads

Use of mulches and their effects on the radish crop
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Santos, Jerffson L.

; Fernandes, Cinira de A. F.

; Oliveira, Luan S.

; Jesus, Cristina M. de

; Porto, John S.

; Rebouças, Tiyoko N. H.

Revista Brasileira de Engenharia Agrícola e Ambiental

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Nov 2016, Volume 20 Nº 11 Páginas 955 - 959

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

RESUMO Objetivou-se, neste estudo, avaliar a influência da adubação verde e do composto na produção do rabanete cv. Cometa. O delineamento experimental adotado foi em blocos casualizados com 6 tratamentos e 4 repetições sendo T1 - Leucena, T2 - Madeira-nova, T3 - composto (palha de milho e esterco bovino compostado), T4 - capim sempre verde + palha de milho e esterco bovino compostado e T5 - capim sempre verde e T6 - testemunha sem adubação totalizando 24 parcelas experimentais. A área total da parcela experimental foi de 1,44 m2, com área útil de 0,80 m2 e para cada tratamento foram incorporadas 21,0 t ha-1 de adubo em base seca. A semeadura do rabanete foi diretamente nos canteiros em berços de 2 a 3 cm de profundidade deixando uma planta no espaçamento de 20 cm entre linhas e 5 cm entre plantas; aos 29 dias após plantio foram avaliados a produtividade total, produtividade comercial, a porcentagem de raízes comercial (%) e de refugo (%), massa fresca e seca da parte aérea e das raízes, área foliar total e individual e o índice SPAD. A incorporação da leucaena na quantidade de 21,0 t ha-1 em base seca ao solo proporcionou os maiores acréscimos para as características analisadas.

ABSTRACT This work aimed to evaluate the influence of green fertilization and the compost on the production of radish, cv. ‘Cometa’. The experimental design was randomized blocks with 6 treatments and 4 replicates: T1 - Leucaena, T2 - ‘Madeira-nova’, T3 - Compost (maize straw and composted cattle manure), T4 – ‘Sempre verde’ grass + compost and T5 – ‘Sempre verde’ grass and T6 - control without fertilization, totaling 24 experimental plots. The total area of the experimental plot was 1.44 m2, with useful area of 0.80 m2 and 21.0 t ha-1 of fertilizer (dry basis) were incorporated in each treatment. The radish crop was directly sown in the beds, in 2- to 3-cm-deep holes, leaving one plant at spacing of 20 cm between rows and 5 cm between plants. Twenty-nine days after planting, plants were evaluated for total yield, commercial yield, percentages of commercial roots (%) and waste roots (%), fresh and dry matter of shoots and roots, total and individual leaf area and the SPAD index. The incorporation of Leucaena at the amount of 21.0 t ha-1 (dry basis) promoted the highest increments for the analyzed characteristics.

https://doi.org/10.1590/1807-1929/agriambi.v20n11p955-959 1250 downloads

Morphological and photosynthetic adaptations of Tabebuia aurea seedlings in the nursery
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Gonçalves, Eduardo R

; Souza, Felipe C.

; Santos, Luan N. dos

; Silva, José V.

; Ferreira, Vilma M.

; Endres, Lauricio

Revista Brasileira de Engenharia Agrícola e Ambiental

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Nov 2013, Volume 17 Nº 11 Páginas 1201 - 1209

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Tabebuia aurea (Benth. & Hook. f. ex S. Moore) (Bignoniaceae) é uma espécie arbórea comum no Brasil, utilizada para fins ornamentais de calçadas e parques cuja madeira é usada para fabricação de móveis. O objetivo deste estudo foi avaliar o efeito do sombreamento no crescimento e na fotossíntese de mudas de T. aurea e sua adaptação fotossintética após transferência ao sol pleno. As plântulas de T. aurea foram cultivadas sob 0, 50, 70 e 95% de sombreamento. Sob cada condição de sombreamento foram avaliadas a radiação fotossinteticamente ativa e as trocas gasosas das folhas aos 51 (plântulas jovens) e após 70 dias após a semeadura das sementes sem o uso de luz artificial; logo em seguida as plântulas foram transferidas para o sol pleno e nova medidas foram feitas após 15 min e 3 dias da transferência para a nova condição. As plântulas de T. aurea apresentaram crescimento satisfatório até o nível de 50% de sombreamento no viveiro que pôde ser verificado tanto pelo crescimento como pelo acúmulo de biomassa total. O sombreamento acima de 70% reduziu o número de folhas, área foliar e o diâmetro do coleto em relação às plantas expostas ao pleno sol. Os resultados sugerem que plântulas de T. aurea devem ser cultivadas em sol pleno ou com sombreamento de até 50% para maximizar o crescimento no viveiro e minimizar o estresse de transferência das mudas para o local de plantio definitivo.

Tabebuia aurea (Benth. & Hook. f. ex S. Moore) (Bignoniaceae) is a boreal species common in Brazil. It is used for ornamental parks and along sidewalks. Its timber is also used for furniture. The objective of this study was to evaluate the effect of nursery shading on the growth and photosynthesis of T. aurea and their photosynthetic adaptation after being transferred to direct sunlight. The T. aurea seedlings were grown under 0, 50, 70 or 95% shade. The photosynthetic active radiation and leaf gas exchange were measured over two distinct periods: 51 (young seedlings) and 70 days after having been sown under each shade treatment. Immediately after the measurements were taken, the seedlings were transferred into full sunlight and the measurements were repeated two times after 15 min and 3 days under ambient sunlight. T. aurea seedlings showed satisfactory growth up to 50% shade in the nursery, which could be verified both by growth measurement and by total biomass accumulation. Shading greater than 70% reduced the number of leaves, the leaf area and the stem diameter in relation to plants exposed to full sunlight. The results suggest that T. aurea seedlings should be grown under full sunlight or under shading up to 50% to maximize their growth in the nursery and to minimize stress when transferring the seedlings to their final planting sites.

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Glossário e ajuda para busca

Você pode enriquecer sua busca de uma forma muito simples. Use os índices de pesquisa combinados com os conectores (AND ou OR) e especifique cada vez mais sua busca.

Por exemplo, se você deseja buscar artigos sobre
casos de dengue no Brasil em 2015, use:
ti:dengue and publication_year:2015 and aff_country:Brasil

Veja abaixo a lista completa de índices de pesquisa que podem ser usados:

Cód. do Índice	Elemento
ti	título do artigo
au	autor
kw	palavras-chave do artigo
subject	assunto (palavras do título, resumo e palavras-chave)
ab	resumo
ta	título abreviado da revista (ex. Cad. Saúde Pública)
journal_title	título completo da revista (ex. Cadernos de Saúde Pública)
la	código do idioma da publicação (ex. pt - Português, es - Espanhol)
type	tipo do documento
pid	identificador da publicação
publication_year	ano de publicação do artigo
sponsor	financiador
aff_country	código do país de afiliação do autor
aff_institution	instituição de afiliação do autor
volume	volume do artigo
issue	número do artigo
elocation	elocation
doi	número DOI
issn	ISSN da revista
in	código da coleção SciELO (ex. scl - Brasil, col - Colômbia)
use_license	código da licença de uso do artigo

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Email: scielo@scielo.org

Todo o conteúdo de www.scielo.org, exceto onde está identificado, está licenciado sob uma Licença Creative Commons.
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