The appearance of heavy superphosphate is similar to that of ordinary calcium, usually grayish white, dark gray or grayish black. The granulated fertilizer is usually a 1-5 granule with a bulk density of about 1100 kg / m. The main component of heavy superphosphate is monocalcium phosphate monohydrate. Since the raw material phosphoric acid and phosphate rock contain impurities, the product also contains a small amount of other components. The general grade of international heavy-duty calcium phosphate is N-P2o5-K2O: 0-46-0. China’s industry standard for heavy superphosphate products, HG2219-9l, stipulates that: effective P2O5 ≥ 38% in heavy superphosphate is qualified, and P2 ≥ 46% is superior.

Granular heavy superphosphate can be used directly or as a phosphorus raw material for admixing fertilizers. Powdered granular super-superphosphate can be used as an intermediate product and other nitrogen or potassium-based basic fertilizers or trace element raw materials to be processed into a compound fertilizer containing various nutrients to meet the needs of different soils and crops. .

The advantage of heavy superphosphate is the high concentration of nutrients, and most of them are water-soluble phosphorus, which saves packaging and transportation costs and reduces field costs. Therefore, the construction of a heavy superphosphate device in the phosphate rock producing area is more economical and reasonable. The other advantage of the product is that the P2O5 contained in the product is directly converted from low-cost phosphate rock. That is, more effective P2O5 can be obtained by producing a certain amount of phosphoric acid to produce heavy superphosphate than to produce ammonium phosphate.

Heavy calcium has obvious yield-increasing effects on most crops such as wheat, rice, soybean, corn, talented, etc., such as: can promote early maturity of rice, increase tillering, vigorous growth, thick stems, early heading, and reduce openness; Promote the growth and early maturity of maize seedlings, and promote the plant height, ear weight, grain number per spike, and 1000-grain weight; promote wheat growth in the flood season, robust plants, promote tillering, and have obvious yield-increasing effects; Not only does it maintain good nutrients in the soil, it also enhances root development, increases root numbers, and increases nitrogen supply. Yes, 1, centralized use, 2, mixed with organic fertilizer application, 3, layered application, 4, root external application.