在作物生长发育阶段，肥料没有按人们想象的那样，适时适量按比例供给作物所需要的营养物质。所以单纯从产量考虑，或者单纯从土壤养分丰缺指标考虑，或者凭经验来确定施肥的数量和比例是不全面的，往往达不到高产施肥的目的。因为目前肥料施人土壤后，发生了一些什么样的变化 At the stage of crop growth and development, the fertilizer does not provide the nutrients needed by the crops at a proper and timely rate according to one’s imagination. So simply consider the yield, or simply from the soil nutrient abundance and loss indicators to consider, or empirically determine the amount and proportion of fertilization is not comprehensive, often fail to high-yield fertilization purposes. Because of the current fertilizer applied to the soil, what happened to what kind of change