Evaluation of tolerance to phosphorus shortage in cowpea (Vigna unguiculata L. Walp) in Cuba.. I. nutritive solution culture.
DOI:
https://doi.org/10.15517/am.v13i1.13453Abstract
Phosphorus deficiency is a major limitingfactor for symbiotic nitrogen fixation and grain yield of
legume crops in the tropics. Eight cowpea genotypes of wide
use in Cuba, were grown in hydroponics solutions; supplying
from 50 to 500 µM of P/plant/week. Nitrogen nutrition was
dependent upon symbiotic N2-fixation on adding of 4
mmoles NO3/plant/week. Shoot growth was severely limited
by P deficiency, while dry weight of roots increased in both
groups of plants. Nodule formation was severely decreased
by P deficiency, while specific nodule activity was increased
in the atmospheric N2 fixing plants. Growth response of N2
plants was higher than that of NO3- fed plants due to P use
efficiency, and revealed a the great large N2-fixation
potential of the specie.
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