Ana Paula Nunes

and 3 more

Problems related to the uniform distribution of micronutrients and their low use efficiency are common. One possible solution is to add micronutrients as fertilizer coating. However, it is necessary to comprehend the use of micronutrients applied via coating and their nutrition in the phenological stages of soybean. Therefore, the objectives of this study were to quantify the diffusion and the availability of P, B, Cu, Mn, and Zn in soil after the incubation of fertilizers coated with micronutrients, as well as to evaluate the nutrition, yield, and recovery of nutrients at different soybean phenological stages under controlled and field conditions. The treatments were MAP and NPS coated with Maxxi-Phós® polymer and one of the micronutrient sources: Wolftrax®, Microsol®, or MIB Precise®. The P-diffusion ranged from 5.58 to 18.88 mm. The nutrient recovery varied according to the phenological stage of the plants with emphasis on the V4 stage, which resulted in the following recoveries: B (13.89 to 0.65%), Cu (62.84 to 6.73%), Mn (3.36 to 0.73%), Zn (2.34 to 0.01%). Nutrient exports by soybean were: 55.7 kg ha-1, 209.6, 109, 216.7, and 64.3 g ha-1 of P2O5, B, Mn, Zn, and Cu, respectively. Under field conditions, there was a significant absorption of B, Mn, and Zn at stages R1 to R5.1, while for Cu it was between V4 and R1. The NPS + MIB Precise® fertilizer showed lower accumulations and yield, indicating lower solubility of micronutrients supplied via oxysulfate. The technologies were able to replace the exported nutrients by the soybean.