Influence of some agroclimatic factors and agronomic practices on nitrogen nutrition of chickpea (Cicer arietinum L.)
1988
Wery, J. (ENSAM-INRA, Montpellier (France)) | Deschamps, M. | Leger-Cresson, N.
Drought stress depressed nitrogen fixation more than nitrogen assimilation. The r2048esulting decrease of Acetylene Reduction Activity was related to poorer growth of the vegetative parts of the non-irrigated plants. Winter sowing improved grain and total dry matter production and stimulated ARA to a greater extent than total NRA. These effects could be explained by better growth conditions and less competition between pods and nodules in winter-sown chickpeas. Although nitrogen assimilation is essential to start plant growth and for subsequent establishment of good fixation activity, in fertile soils nitrate supply simultaneously increased assimilation and decreased fixation. Nitrogen nutrition of chickpea was due to a necessary but unstable equilibrium between atmospheric nitrogen fixation and mineral nitrogen assimila
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