The test results showed that with absorbent added into potassium fertilizer, the releasing velocity of potassium ions was slower than ordinary fertilizer.

This compound manure could fairly raise the output of paddy in the trail, and as good as N, P, K fertilizers used.

The S-NPK is a high concentration ternary phosphate compound fertilizer warmly welcomed by the farmers which is developed in China and features low energy consumption and low production cost.