Explanation：Product feature: in Silica-Calcium Organic Fertilizer, the active organic substance is not less than 30%, and organic nitrogen, phosphorus, potassium are all not less than 4%. Its active beneficial bacterium is not less than 20 million/g. Besides, it contains biological enzyme, amino acid, humic acid, amylose, polypeptide, and organic zinc, boron, iron, calcium, magnesium, sulfur and silicon etc.