提高肥效就是用同样多的肥料增产更多的粮食。通常表示肥料肥效的高低,有两种方法:一是用每斤肥料(或每斤有效成份)所能增产的粮食(或其他产品)的斤数表示,以及用相对增产%表示。这种方法比较简便,一般不需要进行化验分析,但缺点是难于直接判断某一施肥方法是否已经充分发挥了肥料的最大增产作用。所以有时要用第二种方 To increase fertilizer efficiency is to produce more grain with the same amount of fertilizer. Usually indicates the level of fertilizer efficiency, there are two ways: First, with per kilogram of fertilizer (or per kilogram of active ingredient) can increase the amount of food (or other products), said, and the relative yield% said. This method is relatively simple and generally does not require laboratory analysis, but the disadvantage is that it is difficult to directly determine whether a fertilization method has given full play to the maximum yield of fertilizer. So sometimes use the second party