EVALUATION OF SOYBEAN PRODUCTION COMPONENTS SUBMITTED TO THE USE OF LONG-LIFE COMMERCIAL INOCULANT

• DOI: 10.22533/at.ed.9733122304089

• Palavras-chave: long life inoculants, Bradyrhizobium, Glycine max L; fungicides and insecticides.

• Keywords: long life inoculants, Bradyrhizobium, Glycine max L; fungicides and insecticides.

• Abstract:

  Long-life inoculants come into existence as an innovative technology, enabling early inoculation in order to facilitate the sowing operation. The objective was to evaluate production components in soybean grown in Pindorama-SP, 2021/22 season, submitted to different treatments via seeds with long-life commercial inoculant applied at 0, 15, 30, 45 and 60 days prior to sowing, associated with the package Basf's chemical technology. The experiment was installed in the field, and consisted of a randomized block design with 8 treatments and 5 replications. The treatments tested were: T1 = Control (without addition of biological inputs), T2 =. Nitrogen fertilization (200 kg of N/ha); T3= commercial inoculant A applied at 0 DAS (days before sowing); T4, T5, T6, T7 and T8 = long-life commercial inoculant B applied to seeds at respectively 0, 15, 30, 45 and 60 DAS. In R8, the number of plants per linear meter (EF) was counted; plant height at maturation (APM) and first pod insertion (AIV). And when the experimental plots were harvested, the average number of grains per pod (NMGV) was evaluated; number of pods per m2 (NV); thousand-grain mass (MMG); grain yield (PG), and total nitrogen accumulated in grains (NTG). The variables were submitted to analysis of variance using the F test, and when significant, the means were compared with each other using the Tukey test at 5%. The results showed that for EF, the treatments did not differ statistically with an overall average of 14.30 plants/m. The tested treatments were also statistically similar for APM, AIV and NMGV, where the general average of 81.55, 16.05 cm and 2.31 grains per pod were observed, respectively. As for NV, T3, T4, T5, T6, T7 and T8, as well as the application of chemical nitrogen fertilization (T2) stood out and statistically differed only from T1. For MMG, T2 stood out with the highest mass of a thousand grains of 136.80 g, differing from the treatment (T7) inoculation at 45 DAS, despite having statistical equivalence with treatments T1, T3, T4, T5, T6 and T8. As for NTG, it was found that T2, T4, T5 and T6 provided the highest increments in relation to this parameter with means of respectively 55.68, 53.51, 53.73 and 54.42 g.kg-1. Treatments T3, T4, T5 and T2 did not differ statistically from each other and stood out with higher PG values of 2961.5, 2996.8, 2883.2, and 2863.9 kg.ha-1, respectively. It can be concluded that the pre-inoculation with the long-life inoculant B applied in up to 15 DAS promoted increases for most of the production components and in terms of PG of 773 kg ha-1, when compared to the non-inoculated control, which can be recommended for use.