Avaliação de fontes e épocas de aplicação de magnésio foliar na cultura soja

Abstract

The objective of this study was to analyze the use of different sources of foliar magnesium at different times of application in the development of the soybean crop, that is, in different stages of development, being applied only in V4 (Three sheets); only at R1 (Beginning of flowering) and at both stages. The experiment was carried out in the field where the following sources of magnesium were applied. The control treatment as T0 followed by the first source in the chelate form, where 240 g ha-1 of Mg was used in the treatment T1V4 applied in V4, 240 g ha-1 of Mg in the treatment T2R1 applied in R1, in the treatment T3V4 + R1 120 g ha-1 of Mg was applied in the V4 stage and 120 g ha-1 in R1. The second source sulphate was used 400 g ha-1 of Mg in the treatment T4V4 in V4, 400 g ha-1 of Mg in the treatment T5R1 in R1, in the treatment T6V4 + R1 has the same dose of 200 g ha-1 of Mg in both phenological stages. The nitrate source was used 198 g ha-1 in V4, 198 g ha-1 Mg in the T8R1 treatment in R1, in the T9V4 + R1 the same dose of 99 g ha-1 was applied in both stages. The experimental design used was a randomized complete block with 10 treatments, one of which was the control and with four replications each treatment, the statistical test used was by Skott Knott, p <0.05. It was verified that the sources of magnesium with their respective doses and the variation in the time of application did not provide significant differences of increase of productivity.