论文部分内容阅读
目前省内常用磷肥主要有过磷酸钙与钙镁磷肥两种。过磷酸钙简称普钙,是用硫酸分解磷矿粉制成的一种速效性磷肥,为灰白色或深灰色粉末状,呈强酸性反应,含游离酸3—5％,具有腐蚀性和吸湿性,含有效磷(P_2O_5)12—18％,其中90％以上为水溶性磷,易被作物吸收利用。钙镁磷肥是用磷矿石与蛇纹石、橄榄石或白云石等含硅、镁的矿石,在高炉中熔融,再经水淬,烘干磨细而成。它是一种灰白色或灰绿色的缓效性磷肥,呈碱性反应,含有效磷(P_2O_5)14—18％,其中磷酸易溶于弱酸(如2％柠檬酸等),而难溶于水,作物可通过根系分泌的弱酸溶解并吸
At present, there are mainly two kinds of commonly used phosphatic fertilizer in the province: superphosphate and calcium magnesium phosphate. Superphosphate, referred to as the general calcium, is a quick-acting phosphate fertilizer made of sulfuric acid decomposition of phosphate rock powder, as a gray or dark gray powder, was a strong acid reaction, containing 3-5% free acid, corrosive and hygroscopic , Containing 12-18% of available phosphorus (P 2 O 5), of which more than 90% is water-soluble phosphorus, which is easily absorbed by crops. Calcium magnesium phosphate is phosphate rock and serpentine, olivine or dolomite and other silicon, magnesium ore, melting in the blast furnace, and then water quenching, drying and grinding. It is an off-white or gray-green phosphate fertilizer with a basic reaction, containing 14-18% of available phosphorus (P 2 O 5), of which phosphoric acid is easily soluble in weak acids (eg 2% citric acid, etc.) The crop can be dissolved and absorbed by the weak acids secreted by the root system