我区磷矿蘊藏丰富,并曾建厂制造磷肥,且在老灌区草甸上上不少地方和不同作物上进行施用,结果表明有一定增产效果,但不够显著。由于磷肥的效果和土类及土壤肥力有着密切关系,因此淡灰鈣上上施用磷肥的效果,确是值得研究的问題。从我站前几年有关试验结果初步看出,淡灰鈣 Phosphorus mine in our district is rich in reserves and has been built to make phosphate fertilizer plant, and in the irrigated area on many places and different crops on the application, the results show that a certain yield-increase effect, but not significant enough. Because of the effect of phosphate fertilizer and soil and soil fertility are closely related, so light gray calcium on the effect of the application of phosphate fertilizer is indeed worthy of study. A few years ago from my preliminary test results showed that light gray calcium