INFLUENCE OF ASSOCIATIONS BETWEEN CHEMICAL PACKAGES AND INOCULANTS WHEN SOYBEAN PRE-SOWING OR NOT. 2018/2019 HARVEST; PINDORAMA-SP (Atena Editora)

Abstract

With the aim of analyzing parameters with a direct and indirect relationship to biological nitrogen fixation and production components in soybeans subjected to different seed treatments with inoculants containing different concentrations of bacteria associated or not with the use of a protector on the day of sowing and the 7 and 14 days prior to sowing (DAS), and their comparison with three different synthetic chemical packages from Basf, Bayer and Syngenta, three experiments were installed in the experimental area of APTA - Polo Regional Centro Norte located in Pindorama-SP, 2018/19 harvest .Each experiment involved a synthetic package applied to the six treatments, therefore with 24 experimental plots. The treatments tested were: T1 = Control (without inoculation); T2 = Nitrogen fertilization with 200 kg nitrogen ha-1 (in installments); T3 = Standard Inoculation1 (Inoculant A = lower concentration of Bradyrhizobium bacteria applied via seed on the day of sowing; T4 = Inoculation (Inoculant B = Higher concentration of Bradyrhizobium bacteria+ Max Protection) applied via seed on the day of sowing; T5 and T6 = Pre- inoculation (Inoculant B + Max Protection) applied to the seed with respectively 7 and 14 DAS The parameters analyzed in R2 in three plants per plot were NODT = total number of nodules; root; MSNDOT= total dry mass of nodules; and in R8, at harvest, the components MMG = mass of one thousand grains and PG = grain productivity. The experimental design was in a simple factorial scheme, 3 packages versus 6 treatments, each experiment. it was in randomized complete blocks with 4 replications. The data were subjected to analysis of variance using the F test and the means compared using the Tukey test at 5%. From the results obtained, it was observed that the overall average of the experiments was the package. from Basf was statistically superior to the others tested for NNOT and MSPA with average values of 17.57 units respectively. plant-1 and 28.64 g. plant-1. In turn, Bayer increased MSNODT, MSR, and PG with respectively 176.50 mg plant-1, 4.54 g plant-1, and 2837.92 kg ha-1 in relation to the other two packages. In relation to treatments, it was found that T4 stood out statistically in relation to the other treatments tested in the average of the three chemical packages in terms of all variables tested, being: with respectively: 34.38 nodules plant-1, 293.03 mg plant -1, 4.71 g, 31.89 g, 172.63 g and 2955.83 kg ha-1. The pre-inoculation treatment at 7 DAS using the B + protective inoculant (T5), despite being inferior to T4, was positioned shortly after and was equivalent to the treatment (T3) that used the standard inoculant A on the day of sowing. for the variables MSNOT, MSR, MSPA, MMG and PG, on the average of the three packages tested. Therefore, considering PG, it can be concluded that greater increases were related to the association of the Bayer chemical package with the T4 treatment, whose grain yield was 3037.50 kg. ha-1.