Adubação nitrogenada, inoculação e aplicação de 'fritas' de micronutrientes na cultura da soja
Palavras-chave:
fixação simbiótica, adubação nitrogenada, micronutrientes fritas, cultura Rhizobium, nódulos radicularesResumo
This study sought to compare the effects of nitrogen fertilizer applied in the rows at planting and side dressed on soybeans (Glycine max (L.) Merrill) grown from seeds inoculated with Rhizobium bacteria and plants grown from uninoculated seeds and the combined effects of these treatments with application of fritted trace elements (F.T.E.).
The trials were carried out at the Center for Experimentation, Research and Extension in the Triângulo Mineiro in Capinópolis, Minas Gerais, Brasil. The soil was characterized as a Latossolo Roxo’ transition to Red-Brown Latosol, sandy clay loam of low fertility. Soybeans had not previously been grown in the experimental area. The trial area was not limed, but the experimental plots received a uniform application of about 500 kg/ha of simple superphosphate and 60 kg/ha of potassium chlorate in the rows at planting time. The soybean variety ‘Santa Rosa’ was used, and inoculated seeds were treated with Rhizobium japonicum. The 12 treatments Were arranged in a randomized block design with four repetitions. Planting was done November 28, 1972.
Agronomic traits compared were: initial stand, stand at harvest, plant and pod height, number and weight of radicular nodules, average weight per hundred seeds and soybean yield. Inoculation increased bean yield and weight per hundred seeds. The effect of application of micronutrients on soybean yield and weight per hundred seeds was highly significant. Nitrogen fertilizer increased bean yield only in the absence of inoculation.
Referências
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