要实现作物一定的单位面积产量,究竟需要多少肥料和怎样确定供应量,是实现高产、稳产、优质,低成本的一个重要问题。如果我们根据作物需肥规律施用肥料,使养分供应合理,其它措施又跟得上,作物就会按照人们的愿望定向生长,获得高产。反之,不但达不 To achieve a certain crop yield per unit area, exactly how much fertilizer and how to determine the supply, is to achieve high yield, stable yield, high quality, low cost an important issue. If we apply fertilizers according to the law of crop fertility, so that nutrient supply is reasonable and other measures are followed, the crop will be directed to grow according to people's wishes and obtain high yields. On the contrary, not only do not reach