DIFERENTES MODOS DE APLICAÇÃO DE INOCULANTES NA CULTURA DA SOJA

Abstract

The inoculation serves to promote the association between microorganismswith the root hairs of the plants. Thus, bacteria promote the biological fixation of atmospheric nitrogen and provide it to the plant, being able to replace nitrogen fertilization. Thus, the aim of this research was to evaluate inoculation and co- inoculation with Bradyrhizobium japonicum and Azospirillum brasilense bacteria in soybean. The study was carried out at the Jenipapo Farm in Rialma, GO. Sowing wascarried out on 2019/12/05 and in the second year on 2020/11/12. Fertilization was with8 kg ha-1 of N, 100 kg ha-1 of P2O5 and 52 kg ha-1 of K2O. The experimental design was randomized blocks with eight treatments and four replications. Harvested on 2020/04/05 and in the second year on 2021/03/16. The variables tested were plant height and height of insertion of the first pod, number of branches per plant, number ofnodes, number of pods per plant, number of grains per pod, mass of 1000 grains andproductivity. T4 (Bradyrhizobium japonicum + Azospirillum brasilense in seed treatment) showed the best results for the number of stems per plant (4.17 stems per plant). The number of total nodes differed only for the 2019/2020 season, whose T4 treatment was the best with 42.17 NTP. The amount of grains per pod was the same for all treatments in the 2019/2020 season, whose averages ranged from 2.33 to 2.58grains per pod. For productivity, T4 was the best in both harvests, whose value was 5,327.50 kg ha-1 in the 2019/2020 harvest and 6,291.50 ha-1 in the following harvest. The inoculation of Bradyrhizobium japonicum + Azospirillum brasilense bacteria in theseed treatment (T4) promoted higher productivity and was the best treatment for most agronomic and production traits.