RESUMO
Em regiões semiáridas, o uso de águas salobras na irrigação pode reduzir o rendimento das culturas. No entanto, a utilização da adubação mineral vem sendo testada para mitigar o estresse salino. Neste sentido, objetivou-se avaliar o efeito do estresse salino em diversos estágios fenológicos na produtividade do amendoim, sob adubação potássica. O experimento foi realizado no período de agosto a novembro de 2021, na área experimental da Universidade da Integração da Lusofonia Afro-Brasileira (UNILAB), Redenção, Ceará. O delineamento experimental foi o inteiramente casualizado (DIC), em um esquema fatorial 6 × 3, com 6 repetições. Foram utilizadas seis estratégias de irrigação com água salobra a partir das seguintes fases: vegetativa (S1); florescimento (S2); aparecimento dos ginóforos (S3); formação de vagens (S4); frutificação (S5) e sem estresse salino (S6) e três doses de potássio; 0, 50 e 100% da dose recomendada. O uso de água salobra na fase vegetativa evidenciou menor comprimento da vagem, massa das vagens, número de vagem, número de vagens comerciais e produtividade. A dose correspondente à 100% recomendada de potássio mitigou o estresse salino nas fases de formação de vagens e floração, proporcionando maior número de vagem comercial, não comercial e total e massa de vagem. O uso de água de menor salinidade durante todo o ciclo proporcionou maior massa de vagem, número de vagens comerciais e produtividade.
Palavras-chave:
Arachis hypogaea L.; Nutrição de plantas; Estresse salino
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Means followed by the same uppercase letter did not differ significantly in terms of the mean values of potassium doses in each strategy, and means followed by the same lowercase letter did not differ significantly in terms of the mean of the different brackish water use strategies at the same potassium dose, both by Tukey test (p≤0.05)
Means followed by the same uppercase letter did not differ significantly in terms of the mean values of potassium doses in each strategy, and means followed by the same lowercase letter did not differ significantly in terms of the mean of the different brackish water use strategies at the same potassium dose, both by Tukey test (p≤0.05)
Means followed by the same uppercase letter did not differ significantly in terms of the mean values of potassium doses in each strategy, and means followed by the same lowercase letter did not differ significantly in terms of the mean of the different brackish water use strategies at the same potassium dose, both by Tukey test (p≤0.05)
Means followed by the same uppercase letter did not differ significantly in terms of the mean values of potassium doses in each strategy, and means followed by the same lowercase letter did not differ significantly in terms of the mean of the different brackish water use strategies at the same potassium dose, both by Tukey test (p≤0.05)
Means followed by the same uppercase letter did not differ significantly in terms of the mean values of potassium doses in each strategy, and means followed by the same lowercase letter did not differ significantly in terms of the mean of the different brackish water use strategies at the same potassium dose, both by Tukey test (p≤0.05)
Means followed by the same uppercase letter did not differ significantly in terms of the mean values of potassium doses in each strategy, and means followed by the same lowercase letter did not differ significantly in terms of the mean of the different brackish water irrigation strategies at the same potassium dose, both by Tukey test (p≤0.05)
Means followed by the same uppercase letter did not differ significantly in terms of the mean values of potassium doses in each strategy, and means followed by the same lowercase letter did not differ significantly in terms of the mean of the different brackish water use strategies at the same potassium dose, both by Tukey test (p≤0.05)