ResumoO presente trabalho objetivou analisar o desempenho fisiológico de sementes de feijão-caupi cv. BRS Pajeú submetidas à diferentes potenciais e agentes osmóticos, permitindo o conhecimento sobre como o estresse influencia na germinação e vigor destas sementes. O experimento foi conduzido no delineamento inteiramente casualizado, com os tratamentos em arranjo fatorial sendo dois agentes osmóticos e cinco potenciais osmóticos (2 × 5), com quatro repetições. Os resultados obtidos foram submetidos à análise de variância, e quando constatados efeitos significativos, foram submetidos à análise de regressão. As condições de estresse salino prejudicaram a germinação e o vigor das sementes de feijão-caupi cv. BRS Pajeú. A diminuição do potencial osmótico das soluções, reduz o desenvolvimento e o ganho de massa fresca e seca das plântulas de feijão-caupi cv. BRS Pajeú, independente da substância utilizada para indução do estresse. O cloreto de sódio (NaCl) promoveu efeitos mais drásticos sobre o crescimento das plântulas, quando comparado ao cloreto de potássio (KCl). As sementes de feijão-caupi cv BRS Pajeú submetidas à solução de NaCl com potenciais osmóticos inferiores a -0,35 MPa, apresentou porcentagem inferior a 80% de germinação.
Studies on the management of peanut crops in the semiarid region of Minas Gerais are scarce. Therefore, the objective was to evaluate the agronomic performance of four peanut cultivars under different irrigation systems and row spacing in northern Minas Gerais. The cultivars IAC 503, Runner IAC 886, IAC Tatu ST, and Crioula were grown at row spacing of 0.5, 0.7, and 0.9 m and irrigated or not irrigated. The following variables were evaluated: Total number of pods, number of commercial pods, number of seeds, mass of one hundred grains, grain yield index, oil content, pod yield, grain yield and oil yield. After analysis of variance, the average values were compared using the Scott-Knott method with a probability of 5%. The spacing of 0.5 m promoted higher productivity in pods, grains, and oil in both systems. Under irrigation, IAC 503 and IAC 886 were the most productive, while the cultivars did not differ under non-irrigated cultivation. Finally, irrigation resulted in an increase in grain yield of up to 50% compared to non-irrigated cultivation.
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