Abstract
Physical and physiological quality of two soybean seeds cultivars in function of potassium and limestone rates. 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 Sao 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.
Highlights
A soja iniciou-se como cultura no Brasil nos anos 40, no Rio Grande do Sul, e nas décadas de 60 e 70 foi introduzida no Centro Oeste brasileiro, onde se consolidou durante a década de 90, principalmente em solos de cerrado
Observaram que a qualidade fisiológica avaliada provavelmente, devido à região de Selvíria através dos testes de germinação, envelhecimento apresentar temperaturas elevadas diminuindo, acelerado e tetrazólio foi significativamente assim, o vigor das sementes de soja que melhor para os tratamentos com doses iguais ou superiores a partir de 80 kg ha-1 de K2O
Analisando-se os dados obtidos para porcentagem média de sementes manchadas (Tabela 11), observa-se que no cultivar MG/BR46 (Conquista), a dose que proporcionou melhor resultado (9%) foi 90 kg ha-1 de potássio, enquanto que no cultivar BRS-133 não houve diferença significativa
Summary
A soja iniciou-se como cultura no Brasil nos anos 40, no Rio Grande do Sul, e nas décadas de 60 e 70 foi introduzida no Centro Oeste brasileiro, onde se consolidou durante a década de 90, principalmente em solos de cerrado. Desdobramento das interações doses de calcário x doses de potássio, significativas para primeira contagem de germinação (%) nos cultivares MG/BR-46 (Conquista) e BRS-133, Selvíria, Estado do Mato Grosso do Sul, 2003.
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