Physical and physiological quality of two soybean seeds cultivars in function of potassium and limestone rates - DOI: 10.4025/actasciagron.v27i2.1844

O uso de sementes de elevada qualidade física, fisiológica e sanitária faz parte de um conjunto de metas para se realizar uma agricultura de alta tecnologia. Com o objetivo de avaliar os efeitos de doses de potássio e de calcário sobre a qualidade de sementes de soja (Glycine max (L.) Merrill.) dos cultivares MG/BR-46 (Conquista) e BRS-133, foi instalado o experimento no ano agrícola 2002/2003, na Fazenda de Ensino e Pesquisa ou pertencente à Faculdade de Engenharia - Câmpus de Ilha Solteira – Unesp. Foram avaliadas três doses de calcário dolomítico (0, 1 e 2 t ha-1), quatro doses de potássio (0, 30, 60 e 90 kg ha-1). Nas parcelas, foram aplicadas as doses de calcário dolomítico a lanço 10 dias antes da cultura ser instalada; as doses de potássio foram aplicadas no florescimento pleno (estádio R2) ao lado da linha de semeadura. Os cultivares responderam à aplicação do calcário e a dose de 2 t ha-1 foi a que proporcionou melhores benefícios. Os cultivares evidenciaram comportamentos diferentes e as doses de potássio não influenciaram a qualidade das sementes.The utilization of seeds of high physical, physiological and sanitary quality is one of the aims to reach high technology in agriculture. The aim of this work was to analyze the effects of potassium and limestone rates on the quality of soybean seeds (Glycine max (L.) Merrill.) of MG/BR-46 (Conquista) and BRS-133 cultivars. The experiment was developed during the 2002/2003 agricultural year on the experimental farm (Fazenda de Ensino e Pesquisa) of the Engineering College – Campus of Ilha Solteira – Unesp (State University of São Paulo). Three doses of dolomitic lime (0, 1 and 2 t ha-1), four dosis of potassium (0, 30, 60 and 90 kg ha-1) were analyzed. The utilized experimental design was composed of randomized blocks in four replications. Dosis of dolomitic limestone were cast on the plots 10 days before the development of the experiment; potassium doses were applied (R2 stadium) beside the sowing line in the full blooming phase. The cultivars responded to the application of lime, in which 2 t ha-1 was the rate that provided the best benefits. Different behaviors were verified in the cultivars. Nevertheless, the doses of potassium did not affect the quality of seeds