Loss Characteristics Of Microcrystalline Rock Phosphate And Its Effects On Agriculture

Phosphorus is one of the three fertilizer elements required for plant growth and development, a variety of compounds involved in the plant’s body build, is an integral part of the plant nutrients. Currently,43%of the world’s agricultural soils Phosphorus In China, about2/3of soil phosphorus deficiency. Of phosphate resources rich reserves, ranking second in the world, but the overall grade of phosphate rock in China is not high, medium and low grade phosphate rock of the total amount of resources80%, mostly collophanite, and the distribution is relatively concentrated, mainly in the Yunnan, Guizhou, Hubei, Sichuan and other places, the difficulty of exploitation. In recent years, due to agricultural nonpoint source pollution to the increasing burden on the environment. A large number of phosphorus with the surface water into the ground freshwater lakes, a reproduction of algae-based substances rich phosphide-point source pollution,75%of China’s lakes are varying degrees of eutrophication. Microcrystalline rock phosphate as a novel phosphate fertilizer particle size compared with ordinary rock phosphate had lower specific surface area has been greatly improved, the crystal structure has also changed, with simple processing, long-acting release, energy saving, less pollution to environment and so on.In this study, the method of the soil column leaching, residential runoff and field trials, discover microcrystalline rock phosphate phosphorus loss impact on the environment, as well as rape, wheat and rice growth and development, nutrient uptake and soil fertility. The main findings are as follows:1. Compared to the ordinary phosphate fertilizer, microcrystalline rock phosphate powder the its on Phosphorus Leaching of the amount of significantly reduce, the respectively, is super-phosphate and for72.8%of of the calcium magnesium phosphate of and75.32%, the leaching coefficient and the leaching rate lower than the over-phosphoric acid calcium and calcium magnesium phosphate.2. In the of surface of microcrystalline rock phosphate powder’s loss of pathway, the phosphorus of granule state of accounted for the most part, rarely of the part of the content of the soluble phosphorus, so as to effectively reduce the the the loss of of the surface runoff of phosphorus, surface runoff microcrystalline rock phosphate powder the amount of phosphorus loss from the phosphate rock powder, respectively, is super-phosphate and calcium magnesium phosphate,54.2%and69.4%. 3. Microcrystalline rock phosphate powder promote the small oilseed rape, the wheat and rice’s growth and development of the wheat and rice and rape on the absorption of the of N, P and K element, higher yield and improved quality, small rape increase production23.8%, wheat increase production of9.61%, Rice Grain Yield in of16.16%, after increase the amount of phosphate rock powder, the yield significant results.4. Microcrystalline rock phosphate powder has increased the wholly-phosphorus in the soil and available phosphorus the content of, at the same time on to maintain the potassium element and available nitrogen in the soil, to reduce losses and improve the utilization have a certain role.