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4.养分齐全,供应及时高产稳产田土壤的养分,必须是种类全,贮量多,对作物供应及时。土壤中的养分,有植物需要较多的大量元素氮、磷、钾等,但也有不可缺少硼、钴、铜、锌、钼、钛、锰等多种微量元素,还需要一些介于两者之间的钙、镁等元素。这些营养元素在土壤中可以分为两种形态,即作物暂时不能利用的迟效态和作物可以立即吸收利用的有效态。这两种形态,在一定条件下能互相转化。
4. Nutrient is complete, timely supply of high-yielding stable soil nutrients, must be full of species, storage and more timely supply of crops. Soil nutrients, plants need more large amounts of elements such as nitrogen, phosphorus, potassium, but there are also indispensable boron, cobalt, copper, zinc, molybdenum, titanium, manganese and other trace elements, but also some in between Between the calcium, magnesium and other elements. These nutrient elements can be divided into two forms in the soil, that is, the delayed effective state of the crop and the effective state that the crop can immediately absorb and utilize. These two forms can be transformed into each other under certain conditions.