作物生长的好坏和产量的高低,主要靠路线、靠干劲、靠“八字宪法”的综合运用.土是基础,水是命脉,肥料是植物的粮食。作物生长在土壤上,从土壤中吸收各种养分。土壤的水、肥、气、热等理化生物性状,耕性结构,生产性能和养分供应能力,直接关系到作物的生长发育和产量水平。通过施肥,不断地补充、调节和增强土壤养分供应能力,是获得高产、稳产的一项重要措施。兹将几种主要作物在一般产量水平下吸收氮磷钾的数量列入下表. The quality of crop growth and the level of output depends mainly on the route, by vigor and on the comprehensive utilization of the “Eight Character Constitution.” Soil is the foundation, water is the lifeblood, and fertilizer is the food of the plant. Crops grow on the soil, absorbing various nutrients from the soil. Soil physical and chemical properties such as water, fertilizer, gas, heat and so on, tillage structure, production performance and nutrient supply ability are directly related to crop growth and yield. Through fertilization, continuous replenishment, regulation and enhancement of soil nutrient supply capacity, is an important measure to obtain high yield and stable yield. The quantities of nitrogen, phosphorus and potassium absorbed by several major crops at the general level of production are hereby included in the table below.