Efeito do nitrato de cálcio na fisiologia e sanidade na semente de Glycine max L.

Abstract

Soybean (Glycine max L.) has a great economic value for Brazil and the world, so producers seek the highest yield from the crop. However, the culture is affected by several diseases that are responsible for causing great losses and can be transmitted via seeds. Thus, seed treatment becomes, then, a fundamental parameter in the management and quality control. The objective was to determine the sanitary and physiological quality of soybean seeds with calcium nitrate in concentrations of 0.2; 0.4; 0.6; 0.8; 1.0; 1.2; 1.4 and 1.6% and dicarboximide fungicide. For the sanity test, 100 seeds were used per treatment, distributed in five repetitions of twenty seeds each. Then the seeds were incubated in petri dishes containing a double layer of “Blotter Test” filter paper, sterilized and moistened with ADE. In the germination test, 100 seeds were also used per treatment, divided into four replications of twenty five seeds. They were sown on germitest paper, first sterilized. The design used in the experiments of sanitary and physiological analysis was completely randomized (DIC). Regression analysis was performed for quantitative data with the significance of the models verified by the F test (p ≤ 0.05). Concentrations of 0.2; 0.4; 0.6; 0.8; 1.0; 1.2; 1.4 and 1.6% of calcium nitrate negatively influenced soybean seed germination. The concentrations of 0.4 and 0.6% provided an increase in the length of roots and plants. All calcium nitrate concentrations were efficient in reducing Aspergillus niger and Aspergillus flavus fungi.