Resposta da soja à inoculação com rizóbio e à suplementação com nitrogênio mineral utilizando diferentes fontes nitrogenadas
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Abstract
The soybean production is among the Brazilian economic activities that have presented more significant progresses in the last decades. The soybean has in its composition a great quantity of proteins, and this makes that the culture needs of great quantities of N, being the most demanded nutrient. The main sources of N for the soybean crop are the nitrogen fertilizers and the atmospheric N which is made available through the biological nitrogen fixation - BNF. The supply of mineral N via fertilizers increases the cost of production. However, the BNF presents inconsistent results regarding the need for application of N supplemental mineral. The objective of this study was to evaluate the response of soybeans to rhizobia inoculation, associated with N mineral supplementation, using different nitrogen fertilizers. The experiment was carried out at the Federal Institute of Education, Science and Technology of Minas Gerais - Bambuí Câmpus, under condition field in Dystroferric Red Latosol. The experiment was carried out under a randomized complete block design (DBC), being nine treatments and four replications, totaling 36 experimental plots. The variables evaluated were: number of nodules per plant, dry matter of nodules, number of pods per plant, number of grains per pod, number of grains per plant and grain yield. The results of the evaluated variables were submitted to analysis of variance (F test at the significance level P <0.05) and the means grouped by the Scott-Knott test at 5% of probability. There was no effect of the inoculation, nitrogen source used and / or N supplementation dose on any of the analyzed variables. Therefore, in soil conditions in which the experiment was conducted, it can be concluded that the inoculation of the seeds with N-fixing bacteria and the supplemental fertilization to N inoculation independent of the nitrogen source used did not influence the soybean crop production.
