New Technology of Deep Placement of Slow Release Nitrogen Fertilizers for Promotion of Soybean Growth and Seed Yield

Soybean seeds contain a large amount of protein (about 35%), and there is a significant correlation between the total amount of N accumulated in soybean plants and seed yield. Soybean utilizes N from several sources, including mineralized soil organic matter, symbiotically fixed N, and N from fertilizer when applied. Soybean plants fix a large amount of N by root nodules symbiotically associated w...