MOREIRA, R. C. L.; http://lattes.cnpq.br/9196855213423448; MOREIRA, Rômulo Carantino Lucena.
Abstract:
Proper irrigation management takes unto account the depth of the water is the most
suitable for the water supply, avoiding reduce plant growth and, consequently, yield
components, quality and grain yield. This study aimed to evaluate the growth, gas
exchange and productivity of cowpea genotypes under the application of difTerent
irrigation. The experiment was conducted under field conditions in the Agrifood Center
of the Federal University of Campina Grande, Pombal Science and Technology - PB.
The experimental design was a randomized block in a factorial 4 x 5, with tour
replications. The fírst factor was formed by tour cowpea genotypes (Rib of Cow,
Golden Pingo, Paulistinha and BRS Marataoã) and the second factor of ave leveis of
irrigation (40, 60, 80, 100 and 120% of actual evapotranspíration). The experimental
unit consisted of tour working planta in the plot. The variables related to plant growth
were analyzed atem diameter at 15 and 30 days after sowing (DAS), number of leaves
per plant at 1 5 and 30 DAS, the absolute growth rate and relative diameter and number
leaves the biomass in the different plana organs such as leaves, petioles, stems, roots and
nodules. Rate in relation to the variables related to gas exchange in the plant were
evaluated photosynthesis (A), transpiration (E), stomatal conductance (gs), intemal
carbon concentration (Ci), intrinsic efl:iciency of water use ( USA) and the intrínsic
efficiency carboxylation (EiCI) and eventually crop yield. The cowpea bean leaves is
the most sensitive variable to water stress. The blade 120% ETR proposed a greater
increase in mass and number of sheets forming independent genotypes. The Cow Rib
genotype best expressed in CO2 assimilation rate. The Paulistinha had the highest
productivity among genotypes.