Soybean response to zinc fertilization in soil with contents above critical level

Abstract

The objective of this work was to evaluate the response of soybean to strategies of zinc fertilization in an Oxisol with initial availability of the micronutrient above the critical level. The experiment consisted of 16 treatments combining different sources, doses, and modes of Zn application. Soybean yield and Zn content in soil, leaves, and grains were evaluated. Zinc fertilization increased soybean yield, even in a soil with the micronutrient availability above critical level. Response to fertilization varies according to zinc application strategies. There is evidence that Zn critical level in soils should be revised.