SOUZA, T. M. A.; http://lattes.cnpq.br/9701892154020400; SOUZA, Tarso Moreno Alves de.
Resumo:
Cowpea (vlgna ur7gu/cu/afa (L.) Walp) has great socioeconomic importance to family
farming as both an energy source and an income alternative. However, its
productivity is considered low due to the use of varieties with low productive capacity
associated to the predominance of the crop under rainfed, being the water deficit one
of the main factors that negatively influence its productivity. The objective of this
study was to evaluate the growth and production components of cowpea (Vlgna
ur7gu/cu/afa (L.) Walp.) under the influence of di#erent leveis of available water in the
soil with and without mulching under the conditions of Pombas-PB. The statistical
design adopted was a randomized block design, in a 4 x 2 x 2 factorial arrangement,
corresponding to the available water leveis (AD) (40; 60, 80 and 100% AD), two
genotypes of cowpea (BRS Pujante and Costela de Vaca), with dead cover (CC) and
without dead cover (SC) on the soil, with four replications, totaling 16 treatments and
64 experimental units. The parameters: stem diameter (DC), main stem length
(CHP), number of leaves per plant (NF), leaf área (AF), number of pods per plant
(NV), pod length , Number of grains per pod (NGV) and weight of one hundred grains
(PI 00G). The water deficit negatively influenced all analyzed variables, regardless of
the management system or genotype usedl The genotype BRS Pujante was superior
in the productive parameters NV, CV, and P100G when submitted to the leveis
between 78 to 95% of AD in the soill The genotype of Costela de Vaca was superior
in the variables CHP. NF and NV when submitted to water stress: Soil cover reduced
the effects of water stress under the growth and development of both genotypes
analyzed in the present study.