Phosphate rock can be applied during tillage as a core phosphate fertilizer.
Recommended application rate for Chilisai Rock is 1.0-3.0 tonnes per hectare, once in 3 to 4 years.
On neutral and lightly alkaline soils it can be activated by application of acidic agents such as ammonium nitrate and animal manure. Combination of application of phosphate rock, once in 3-5 years, and periodical application of ammonium sulphate is especially recommended for legumes, nuts, and oil crops.