Doses complementares de inoculante Bradyrhizobium japonicum via foliar em diferentes estádios fenológicos na cultura de soja

Abstract

The objective of this work was to verify the benefits of Bradyrhizobium inoculation in soybean cultivation, in three phenological stages V2, V4 and V6, by spraying in cover, in order to evaluate the benefits of inoculation in the vegetative development area, chlorophyll, plant height, leaf area, number of leaves and leaf area). The experimental design was a randomized complete block (DBC) with four replications in a 5x3 factorial scheme, totaling 60 plots. The first factor was the application of liquid inoculant with the bacterium Bradyrhizobium japonicicum in doses: 0; 75; 150; 225 and 300mL ha-1 at the concentration of 7.5x109 CFU per mL ha-1. And the second factor was the times of application in the three vegetative stages: V2, V4 and V6. At the time in V4 when no applications were made, the best means for chlorophyll index were found, while it was observed that there was no difference. For dry mass of the area in doses 0 and 75 mL in V4, presented better means with mean values of 38.132 for dose 0 mL, and 42.367 for dose 75 mL. For plant height in the doses of 0 and 300 ml in V4 and V6, presented better means with average value of 1,222 and 1,152 respectively. There were no influence of the treatments on: productivity, number of leaves and leaf area. Leaf application of inoculant increases the growth and chlorophyll content of soybean plants.