磷肥是水稻必需营养元素之一,但其效果的显著程度不仅与气候、土壤、地形、使用方法和使用时期有关,就是这些条件一致,其他如耕作、肥力和水稻种类不同,效果还有高低。为摸清这些情况,我們在江西省大余县新城公社紫色土低产田上,选择了有代表性的田块,进行了如下几項对比试验。沾根的磷肥,有过磷酸鈣和鈣鎂磷肥。前者含水溶性P_2O_518%,每亩沾根用量为5斤,拌泥土25斤;后者含构溶性P_2O_518%,每亩用量为30斤,不拌泥土。 Phosphate fertilizer is one of the essential nutrients for rice. However, the significance of its effect is not only related to the climate, soil, topography, methods of use and period of use, but also the conditions are the same. Others such as tillage, fertility and rice varieties have different effects as well as high and low effects. To find out these situations, we selected a representative field in the purple soil low-yield field of Metro Town, Dayu County, Jiangxi Province, and conducted the following comparative tests. Zhan root phosphate fertilizer, there are superphosphate and calcium magnesium phosphate. The former containing water-soluble P_2O_518%, the amount of roots per acre was 5 pounds, 25 kg of mixing soil; the latter containing soluble P_2O_518%, the amount of 30 acres per mu, not mixed with soil.