宋河区是一个丘陵地区,历年粮食产量不高。粮食产量不高的原因,除田多、劳少和耕作制度改革不够外,土壤缺磷,也是一个重要因素。近年来,我们在一些缺磷的死黄土田、冷水田推广施用了过磷酸钙,收效很大,一般增产10％左右,高达30％,颇受群众欢迎。1964年秋,由于过磷酸钙不足,我们推广了钙镁磷肥(江西产品),全区施用面积达1.2万亩。1964—1965年,我们就钙镁磷肥对小麦、豌豆的肥效进行 Songhe District is a hilly area, the annual grain output is not high. The reasons for the low grain yield are not enough for the reform of farming and labor systems and the lack of phosphorus in soils. This is also an important factor. In recent years, we have promoted the use of superphosphate in cold paddy fields and cold paddy fields that are deficient in phosphorus. The yield is very high, generally increasing by about 10% and up to 30%, which is very popular with the public. In the autumn of 1964, due to the shortage of superphosphate, we promoted the calcium-magnesium phosphate fertilizer (Jiangxi product), and the whole area has an area of ​​12000 mu. From 1964 to 1965, we conducted a study on the effect of Ca, Mg and P fertilizers on wheat and peas