.小养分率是德国化学家李比西提出来的。他曾说过：如果土壤中某一种必需养分不足，或者缺乏的时候，即使其他养分都存在，这种土壤仍将成为不毛之地。也就是说，在某种土壤中限制产量的因子是其中.为不足的一种养分。.小养分律提醒我们，在施肥时应找出.影响作物产量的缺乏养分，以及各种必须养分之间的适当比例的关系。.小养分不是固定不变的，解决了某种.小养分之后，另外某种养分可能上升为.小养分。

The minimum nutrient rate was proposed by the German chemist Libisch. He said if soil is deficient in one of the essential nutrients, or if it is deficient in the presence of all other nutrients, the soil will remain barren.In other words, the factors that limit yield in a particular soil are the most deficient of the nutrients.The law of minimum nutrients reminds us that when applying fertilizer we should find out which nutrient deficiencies most affect crop yield and the appropriate proportion of the various essential nutrients.The minimum nutrient is not fixed. After solving one minimum nutrient, another nutrient may rise to the minimum nutrient.