Preparation methods and properties of the double-coated slow-release organic- inorganic compound fertilizer for saline soil modification

Utilized the cotton straw compost (CSC) as principle material, a new type double-coated slow-release organic-inorganic compound fertilizer (DSCF) was prepared to raise the efficiency of fertilizer in saline land. The DSCF was composed of three parts, of which the exterior coat for water absorption and water-retention was a mixture of CSC, gypsum, superabsorbent polymers (SAP), the inner coat for nutrient slow-release and improvement of fertilizer was gypsum, humic acids (HAs), and adhesive, and the core for nutrients supply was water-soluble NPK compound fertilizer. The product contained nutrients of 4.92% nitrogen (N), 4.37% phosphorus (P 2 O 5 ) and 4.62% potassium (K 2 O). The largest water-holding ratio of saline soil was improved from 39.53% to 46.04% and the water evaporation lose from soil was decreased about 12%-20% by DSCF treatment. After DSCF being incubated in soil, the nutrient release ratio was below 70% for 35 days, while that of untreated NPK fertilizers (common NPK compound fertilizer) was more than 80% within 3 days for N and K and within 14 days for P. Our results indicate that the DSCF could be well applied in saline soil or the arid regions.

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