Doses de inoculante na cultura da soja em primeiro ano de cultivo

Abstract

The soybean [Glycine max (L). Merrill] is one of the most cultivated species in the world, mainly because it is a source of oil and protein. Brazil is the second largest producer of this legume in the world. Given the importance of soybean in the Brazilian economy, research institutions have developed a technology that promotes plant production minimizing the impact on the environment through the use of inoculant with the objective of replacing the use of nitrogen fertilizers in crops. The inoculation process consists in the use of nitrogen fixing bacteria added to the seeds of the plants before sowing. The objective of the present study was to verify the response of the soybean crop to inoculant doses in the first year of cultivation with the soybean crop. This research was carried out in the experimental area of the Federal University of Mato Grosso, located in the municipality of Sinop. The experiment was carried out in a randomized complete block design in a 5 x 3 factorial scheme, with four replications, where the treatments consisted of the combination of five inoculant doses (0; 150; 300; 450 and 600 mL ha-1) with three cultivars of soybean (TMG 132 RR, TMG 133 RR and TMG 1179), totaling 15 treatments. It was observed that the cultivar TMG 1179 presents nodulation response, but this does not alter its productivity, even in doses of 600 mL ha-1. In addition, cultivar TMG 132 RR did not have good nodulation, but was more productive than TMG 133 RR and TMG 1179 in areas of first year of soybean cultivation.