Inoculação e coinoculação de Azospirillum brasiliense e Bradyrhizobium japonicum, em cultivares de soja de diferentes grupos de maturação

Abstract

Soy (Glycine max), is a crop that has a wide possibility of use, and can be used for hu man and animal food. From the production of vegetable oil, biodiesel, soybean meal among other things. It is reported in some studies that the co-inoculation of Bradyrhizobium and Azospirillum, provide some significant benefits. However, there are also works in which there is no significant improvement in crop yield. Apparently the results vary according to the cultivar. The objective of the work is to verify whether the benefits, when using inoculation and co-inoculation, in soybean cultivars. The experiment was carried out in the experimental area of the Federal University of Fronteira Sul Campus Cerro Largo. A randomized block design was used, with three replications and a total of 12 treatments. Totaling 36 installments. Three cultivars (BMX Raio IPRO, BMX Delta IPRO and BMX Compacta IPRO) were used, and each cultivar was subjected to 4 inoculation managements (without inoculation, inoculated with Bradyrhizobium japonicum, inoculated with Azospirillum brasiliense, and coinoculated with Bradyrhizobium japonicum e Azospirillum brasiliense). Sowing was carried out on November 22, 2019. The number of pods per plant, weight of a thousand grains, number of grains per plant and grain yield (kg ha-1 ) were evaluated. The harvest was made on March 26, 2020. The data collected were an alyzed by analysis of variance, using the Sisvar software. The averages were compared using the Tukey test at 5% probability of error. There was no interaction of cultivars with the 4 inoculation managements. There was a statistical difference for grain yield (kg ha-1 ), with the cultivar Raio and cultivar Delta being the ones that produced the most. There was a significant difference in the PMG (weight of a thousand grains) between cultivars, with the cultivar Raio being the one with the highest PMG.