编辑同志:你刊1979年第2期介绍文水县开栅大队小麦高产经验时讲道:灌浆抽穗期间喷1—2次磷酸二氢钾,每亩可增产40斤。1980年第3期《冬小麦磷素营养规律》一文则认为:生产上搞根外喷磷意义不大,特别是在有足够磷肥的土壤上,很难靠根 Editor comrades: You No. 2, 1979 Introduction Wenshui County Openning Gate wheat production experience when the sermon: filling 1-2 hours during the filling of potassium dihydrogen phosphate, yield 40 pounds per mu. 1980 the third period “winter wheat phosphorus nutrition law,” a text that: the production of phosphorus out of roots is of little significance, especially in the soil with enough phosphate, it is difficult to rely on roots