There are many ways to fertilize crops. Different fertilization methods not only have different characteristics, but also have different effects.
Different fertilization methods have their own specific sites. In general, for legume crops and other food crops, the appropriate location for fertilization is at a distance of 5 to 6 cm from the seed horizontal distance and the plant vertical distance. Under the conditions of machine-casting, layered fertilization can be carried out, and the fertilizer side depth is applied to the place 5-10 cm below the seed. The position of the top dressing is far from the main root, depending on the type of crop and the age of the crop. The larger the plant type and the older the plant, the farther the fertilization position is from the main root of the plant. In addition, in sandy soils, fertilizers should be applied in depth; in clay soils, fertilizers should be applied shallowly. In general, the fertilizer is applied to the main root side of the plant 5 to 10 cm, and the depth is about 10 to 15 cm.
Top dressing is a special fertilization method, which is mainly absorbed by the leaves through the pore diffusion, because the green stems and leaves of crops are suitable parts for top dressing, especially the green functional leaves that grow young and grow vigorously, and the effect of fertilizer absorption optimal. It is worth noting that the epidermal tissue in the front of the dicotyledonous leaves is a layer of closely arranged palisade tissue with small intercellular spaces. The nutrients in the fertilizer solution are difficult to break through the "blockade" and penetrate. However, the back of the leaves is different. The epidermis tissue is all loosely arranged in the sponge tissue. The cell gap is large, and the nutrients in the fertilizer solution are easy to enter and are quickly absorbed. Therefore, when the roots of the dicotyledonous crops are topdressed, the front and back sides of the leaves should be evenly sprayed. Monocotyledonous crops are sprayed from top to bottom to the front of the leaves. In addition, elements such as nitrogen, potassium and sodium are more mobile in crops, and phosphorus, sulfur and chlorine also have certain mobility, while elements such as zinc, copper, manganese and strontium are relatively weak. For elements with low mobility or inability to move, the focus of the foliar application should be on the new blade, such as spraying onto the old blade, the expected effect is not achieved.
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