Photosynthetically Active
Mostrando 25-36 de 129 artigos, teses e dissertações.
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25. Solar radiation use efficiency by soybean under field conditions in the Amazon region.
Abstract ? The objective of this work was to evaluate the efficiency of soybean (Glycine max) in intercepting and using solar radiation under natural field conditions, in the Amazon region, Brazil. The meteorological data and the values of soybean growth and leaf area were obtained from an agrometeorological experiment carried out in Paragominas, Pará state
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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26. Disponibilidade da radiação fotossinteticamente ativa ao longo de colunas de cultivo vertical de morangueiros em função do espaçamento e superficie refletora / Availability of Photosynthetically active radiation alone the columns of vertical strawberry growth in function of spacing and reflective surface
The objective of this research was to increase the offer of Photosyntetically Active Radiation(PAR) trough vertical bags for strawberry production. To aim this objective two strategies were adopted the increase of distance among columns of the vertical bags and the use of reflective surfaces over the floor of the greenhouses under the bags. The distances use
Publicado em: 2009
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27. Photo-oxidative stress in coconut seedlings: early events to leaf scorching and seedling death
Experiments were conducted on coconut seedlings to delineate events of photo-oxidative stress damage. Studies on chlorophyll fluorescence indicated a clear case of excess light energy under high light conditions causing stress to coconut seedlings raised under coconut palms. Quantum yield of photo-chemistry of leaflets exposed to high light was significantly
Brazilian Journal of Plant Physiology. Publicado em: 2009
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28. Variation in protein and pigment content in colour strains of Gracilaria domingensis in the natural populations of Rio do Fogo (RN) / Variação no conteúdo protéico e pigmentar em variantes cromáticas de Gracilaria domingensis nas populações naturais de Rio do Fogo-RN, BRASIL
The seaweed Gracilaria domingensis is a common species in the coast of Rio Grande do Norte. This species lives in the intertidal zone, where colour strains (red, green and brown) co-occur during the whole year. Seaweeds that live in this region are exposed to daily changes and to the rhythm of the tide. During the low tide they are exposed to dissection, hip
Publicado em: 2009
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29. Efeitos da radiação ultravioleta-b sobre a morfisiologia de kappaphycus alvarezii (DOTY) doty ex P. Silva (gigartinales) variantes pigmentares verde e vermelha
The effects of ultraviolet radiation in the biological relevant wavebands of UV-A (315#400 nm) and UV-B (280#315 nm) on algae have become an important issue as a man-made depletion of the protecting ozone layer has been reported. However, experimental designs to investigate this issue are manifold and the target organisms are extremely diverse. Data are incl
Publicado em: 2009
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30. Estabelecimento de pastagens de tifton 85 sob doses de adubação nitrogenada. / Establishment of pastures of tifton 85 under levels of nitrogen fertilization.
This work was carried out in order to obtain subsidies under the definition of strategies for nitrogen fertilization of pastures of tifton 85, based on monitoring the dynamics changes in the structure of swards. The underlying assumption was that the application of increasing levels of N is a powerful tool for that purpose. The experiment was developed over
Publicado em: 2008
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31. Anatomical and physiological plasticity of leaves of Coffea arabica L. in response to irradiance / Plasticidade anatômica e fisiológica de folhas de Coffea arabica L. em resposta à irradiância
Morphological, physiological and biochemical parameters were examined in coffee leaves from different canopy positions. Four classes of leaves were chosen based on the mean diurnal intercepted photosynthetically active radiation. These classes (treatments) comprised leaves intercepting 30, 75, 300, 750 μmol photons m-2 s-1, hereafter referred to T1, T2,
Publicado em: 2008
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32. Microclimate characterization of the protected environment cultivated with french-beans / Caracterização do microclima de ambiente protegido cultivado com feijão-vagem
The protected environment changes the meteorological elements in its interior related to the outward environment. The french-beans culture is considered a high risk one, being so sensitive to adverse meteorological conditions. The cultivation in protected environment may become viable the production in South Region under unfavorable year period. Due to the e
Publicado em: 2008
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33. Algoritmo regional de monitoramento da taxa de fixação de carbono pelas florestas tropicais da América do Sul / Regional algorithm for monitoring the carbon assimilation by tropical forests of the South America
The most likely scenario for the next decades presents strong modifications in the global environment, including increase of the atmospheric concentration of CO2 and other trace gases, climate change and intensification of the impacts caused by the man s action. These changes may cause important modifications in the composition, structure and distribution of
Publicado em: 2008
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34. ComposiÃÃo quÃmico-bromatolÃgica e digestibilidade da dieta e desempenho produtivo de ovinos em capim-tanzÃnia sob trÃs frequÃncias de desfolhaÃÃo e dois resÃduos pÃs-pastejo. / Chemical composition and digestibility of diet and performance productive of sheep in tanzania grass with three frequences of desfoliation and two residues after-grazing
A pesquisa foi conduzida no campo avanÃado do NÃcleo de Ensinos e Estudos em Forragicultura-NEEF/DZ/CCA/UFC (www.neef.ufc.br), localizado na fazenda experimental Vale do Curu â FEVC/CCA/UFC, em Pentecoste/CE. Objetivou-se avaliar a composiÃÃo quÃmico-bromatolÃgica e digestibilidade da dieta consumida e o desempenho produtivo de ovinos pastejando em Pa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/04/2007
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35. Crescimento e morfofisiologia do dossel do capim-tanzÃnia com trÃs freqÃÃncias de desfolhaÃÃo e dois resÃduos pÃs-pastejo / Growth and morphophysiology in canopy tanzÃnia grasses with three defoliation frequencies and two post-grazing residues
A pesquisa foi realizada com o objetivo de avaliar o crescimento e as caracterÃsticas morfofisiolÃgicas do dossel de Panicum maximum cv. TanzÃnia sob lotaÃÃo rotativa com trÃs perÃodos de descanso e dois resÃduos pÃs-pastejo. A pesquisa foi conduzida no campo avanÃado do NÃcleo de Ensino e Estudo em Forragicultura-NEEF/DZ/CCA/UFC, localizado na Fa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/02/2007
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36. Estudo bioquimico e da estrutura foliar de plantulas do jatoba da mata (Hymenaea courbaril L.) e do cerrado (Hymenaea stigonocarpa Mart.) expostas a concentração elevada de C O IND. 2 / Structural and biochemical study of leaves of jatobas Hymenaea coutbaril L. and H. stigonocarpa Mart. exposed to elevated concentrations of carbon dioxide atmosphere
The atmospheric concentration of carbon dioxide (CO2) increased from 280 ppm, during the Industrial Revolution period, to about 370 ppm in the nowadays. It is continuing to increase about 1.8 ppm per year. The effect of this rise in CO2, which is leading to global warming have attracted considerable attention, generating reports on how these changes can affe
Publicado em: 2007