Relationship between phosphorus supplying and water deficit in soybean/Relacao entre adubacao fosfatada e deficiencia hidrica em soja

The objective of this study was to investigate the effects of phosphorus supplying on growth and photosynthesis of Glycine max (L.) Merr. cv. 'Embrapa 48', cultivated under water deficit in greenhouse conditions, taking into account the hypothesis that phosphorus suply could improve plant...

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Bibliographic Details
Published in:Ciência rural 2009-10, Vol.39 (7), p.1967
Main Authors: Firmano, Rerold Samuel, Kuwahara, Frank Akiyoshi, Souza, Gustavo Maia
Format: Article
Language:Spanish
Subjects:
Atmospheric carbon dioxide
Photosynthesis
Phytochemistry
Soybean
Water
Water use
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Summary:The objective of this study was to investigate the effects of phosphorus supplying on growth and photosynthesis of Glycine max (L.) Merr. cv. 'Embrapa 48', cultivated under water deficit in greenhouse conditions, taking into account the hypothesis that phosphorus suply could improve plant tolerance to drough. After the development of the first pair of totally expanded leaves, it was initiate the process of induction of water deficit, using two irrigation levels, 100% and 25% of evapotranspiration replacement Water deficit reduced dry mass, leaf water potential, stomatal conduction, and net C[O.sub.2] assimilation regardless P supply. The results of the photosynthetic analysis indicated that phosphorus supply was just partially effective to reduce water deficit effects on G. max cv. 'Embrapa 48'. However, additional P supply influenced positively the production of plants root biomass under water deficit.
ISSN:0103-8478