Influence of foliar fertilization with manganese on germination, vigor and storage time of RR soybean seeds

Abstract

RESUMOThis study aimed to evaluate the influence of foliar fertilizer doses containing Mn of phenological stages of suggested application in RR soybeans, to recover management damages with glyphosate at postemergence application on seed vigor in post-harvest and post six months storage. The seeds originated from a field experiment conducted , which included two applications of glyphosate, concomitant with foliar fertilizer in growth stages V4 and V6, with 0.00, 113.50 and 227.00 mg ha -1 doses of Mn 2+ . Germination, GSI (Germination Speed Index), electrical conductivity tests and the first count of seeds were conducted. The application of Mn did not affect the physiological quality of RR soy in postharvest. However, in post-storage, higher doses of Mn had a negative effect on tests of abnormal seedlings, GSI and electrical conductivity. The applications of Mn, regardless of the developmental stage, did not interfere in the germination and first count tests, with and without storage. The electrical conductivity test showed a higher correlation with the seed germination test in the post-harvest treatment. Influência da fertilização foliar com manganês para a germinação, vigor e tempo de armazenamento de sementes de soja RREste trabalho propôs avaliar a influência de doses de fertilizante foliar com Mn e de estádios fenológicos de aplicação sugeridas, em soja RR, para se recuperar de injúrias do manejo com glyphosate em pós-emergência, sobre o potencial fisiológico das sementes em pós-colheita e pós-armazenamento de seis meses. As sementes foram originadas de um experimento realizado a campo, que contou com duas aplicações do herbicida, concomitantes com fertilizante foliar, nos estádios fenológicos V4 e V6, com doses de 0,00; 113,50 e 227,00 mg ha -1 de Mn 2+ . Foram conduzidos testes de germinação, de IVG (índice de velocidade de germinação), de condutividade elétrica e de primeira contagem em sementes. A aplicação de Mn não influenciou a qualidade fisiológica da soja RR em pós-colheita. Já, em pós-armazenamento, as doses mais elevadas de Mn tiveram efeito negativo nos testes de plântulas anormais, de IVG e de condutividade elétrica. As aplicações de Mn, independentemente do estádio fenológico, não interferiram nos resultados dos testes de germinação e de primeira contagem, com e sem armazenamento. O teste de condutividade elétrica apresentou maior correlação com o teste de germinação de sementes no tratamento pós-colheita. Palavras-chave:Glycine max L., qualidade fisiológica, micronutriente, glyphosate. 447Influence of foliar fertilization with manganese on germination, vigor and storage time... Rev. Ceres, Viçosa, v. 62, n.5, p. 446-452, set-out, 2015

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