Avaliação da tolerância de 5 genótipos de feijão nhemba (Vigna unguiculata (L.)) à deficiência hídrica durante a fase da plântula

Abstract

The objective of this study was to evaluate the tolerance of five cowpea genotypes to water deficit imposed at the seedling stage. To this end, an experiment was conducted in the experimental field of the School of Agronomy and Forestry Engineering. The design used was a completely randomized design (CCD), with five replicates and 10 treatments that were subdivided into two regimes (the fully irrigated regime, which served as a control, and the stressed regime, or with irrigation cut), totaling 25 experimental units of plastic bags for each regime. In the irrigated regime, irrigation continued until the end of the project, unlike the stressed regime, where irrigation was stopped on the 10th day after plant emergence and resumed when the most susceptible genotype was completely dead. The experiment was conducted in plastic bags containing 1 kilogram of soil, previously sterilized in the laboratory for 3 days at 65°C. The genotypes used were: local varieties P81, P23, P84, 2246x503-9-1, and B21x2246-4. The results show that genotypes B21x2246-4 and P84 were tolerant to water stress at the seedling stage, while genotypes P23 and 2246x503-9-1 were moderately tolerant at this stage. Genotype P81, because it had the highest number of dead plants, was the most susceptible.(TRADUÇAO NOSSA)