The " Haizhidun No. 1" soil conditioner is prepared by mixing sepiolite as the main raw material and adding phosphorus, calcium-containing alkaline material and nitrogen fertilizer synergist. The technical parameters of " Haizhidun No. 1" soil conditioner are: pH 10.5-12.5, P2O5 ≥ 4%, CaO ≥ 25.0% and MgO ≥ 4.0%. This product is a kind of soil conditioner that combines nutrition, acid adjustment and cadmium reduction. There is a large specific surface area and abundant pore structure in sepiolite, which has good adsorption properties and can effectively absorb heavy metal ions in the soil, reducing the toxic effect of heavy metals, especially cadmium. Alkaline material that contains phosphorus and calcium can supply the phosphorus and calcium nutrition needed by rice, promote the growth and tillering of rice in the early stage. It can also increase the pH value of the soil significantly, promote the formation of bound precipitates of the heavy metals in the soil and passivate the heavy metals in the soil. Nitrogen fertilizer synergist can inhibit nitrification of ammonium nitrogen by nitrite bacteria in soil, reduce nitrification loss of ammonium nitrogen under long-term flooding irrigation condition and increase nitrogen fertilizer utilization rate.

"Haizhidun 2" soil conditioner uses sepiolite as the main raw material, and it is a kind of soil conditioner that combines nutrition, acid adjustment and cadmium reduction. The technical parameters of " Haizhidun 2" soil conditioner are: pH 10.5-12.5, CaO ≥ 35.0%. The product has entered the "Comprehensive prevention and control of heavy metal pollution in rice demonstration area of Southern region" centralized display platform of 

new products for remediation of heavy metal pollution in arable land, with the average cadmium reduction of 62.90%.