A Soil Amendment and Its Preparation Method

The amendment consists of 1~10 parts of dolomite and 1~40 parts of urea, with the optimal ratio being 5 parts of dolomite combined with 10 parts of urea. For preparation, the two raw materials are separately ground and sieved through a 200-mesh sieve before mixing; the mixture is then calcined at 500 °C for 2 hours under aerated conditions, followed by re-grinding and sieving to obtain the final product.

This soil amendment features low-cost raw materials and a simple preparation process. It can significantly increase soil pH, reduce exchangeable aluminum content to eliminate aluminum toxicity, and improve soil permeability. The optimal application rate is a solid-to-solid ratio of 0.5% (amendment to soil).