Open AccessResponse of sugar cane to limitation hydric and nitrogen dose
Author(s) -
Campos de Oliveira Renato,
Barbosa da Silva Fábia,
Batista Teixeira Marconi,
Carlos Costa Alan,
Antônio Loureiro Soares Frederico,
Aparecida Megguer Clarice
Publication year - 2016
Publication title -
african journal of agricultural research
Language(s) - English
Resource type - Journals
ISSN - 1991-637X
DOI - 10.5897/ajar2015.10698
Subject(s) - hydric soil , photosynthesis , nitrogen , cane , agronomy , environmental science , turgor pressure , chlorophyll fluorescence , leaf area index , crop , sugar , chlorophyll , soil water , chemistry , horticulture , botany , biology , soil science , biochemistry , organic chemistry
The great social and economic importance of sugarcane makes it critical to understand the responses of the crop to adverse stress. This study was carried out to characterize the morpho-physiological index of sugarcane cultivated under different levels of water replacement with four replicates, corresponding to five levels of water replacement (100, 75, 50, 25 and 0% of soil humidity at field capacity) and either associated or not with a nitrogen source (100 kg ha-1 de N). Leaf area, leaf water potential, gas exchange, and chlorophyll fluorescence were determined at different stages of plant development. Suboptimal maintenance of turgor pressure by water potential reduced the photosynthetically active area of sugarcane submitted to hydric deficit. A water replacement of 75% in association with nitrogen promoted optimal maintenance of the photosynthetic process. Key words: Photosynthetic efficiency, nitrogen supply, water potential.
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