Avaliação agronômica da soja com aplicação de magnésio foliar

Abstract

World soybean production in the 2018/2019 harvest was 358.77 million tons. This plant that has great influence on the world market, and has a large part of its production coming from Brazil, with about 117 million tons harvested from grains. To improve productivity, producers are looking for technical and innovative methods, however, what is currently most concrete is the answer in productivity due to foliar fertilization. The present work aimed to agronomically analyze soybean, under the application of foliar fertilizers based on magnesium. The experiment was carried out in the 2015/2016 crop year, in two different cities, São Gabriel do Oeste - MS under a Red Latosol and Bandeirantes - MS under a Quartzarenic Neossolo, in experimental areas in the field. The design used was in experimental blocks with 4 replications, plots composed of 5 lines (0.45m) x 8 meters, totaling 18m2, with an approximate number of 12.6 plants m-1. The experiment of the same configuration was conducted in both areas. The foliar applications were Magnesium (Chelate) 5%, Magnesium Sulphate 8%, Magnesium Nitrate 8%, and a portion without application whose would be the witness. The applications were made in the phenological stages V4, R1 and R1 + V4, all with the same dose of 200g ha-1 per treatment. After the samples were collected, he was taken to the laboratory to perform the statistics, the averages were subjected to the Skott-Knott test at 5% probability, to test its variance. In the variables, number of pods per plant and productivity, a statistical difference was obtained, highlighting productivity by increasing more than 15% in two treatments carried out in São Gabriel do Oeste. It is concluded that the application of certain sources of magnesium in certain phenological stages, is feasible to increase the final productivity of the soybean crop, however, it is necessary that all other edges of the plant nutrition are properly provided.