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 special suitable sites. In general, for legume crops and other food crops, the appropriate location for applying the fertilizer is at a distance of 5 to 6 cm from the seed and at a vertical distance from the seed. Under the sowing conditions, layered fertilization can be carried out, and the fertilizer can be deeply applied to the place 5 to 10 cm below the seed. The location of the top dressing from the main root depends on the type of crop and the age of the plant. The larger the plant type and the longer the plant age, the farther the distance from the main root of the plant is. In addition, sandy soil, fertilizer should be deep; clay, fertilizer should be shallow. In general, the fertilizer should be applied to the root side of the plant 5 to 10 cm, depth of about 10 to 15 cm is appropriate.
Extra-root fertilizer is a special fertilization method. It is mainly absorbed by leaves through stomatal spread, because the green stems and leaves of crops are suitable sites for extra-root top dressings, especially the green functional leaves that grow young, grow vigorously, and absorb fertilizer. optimal. It is worth noting that in the epidermis tissue of the frontal leaves of dicotyledonous crops, there is a tightly packed palisade tissue with small cell gaps. Fertilizer nutrients can hardly break through the â€œblockadeâ€ and penetrate. However, the back of the leaves is different. All the epidermis tissues are loosely arranged sponge tissue, the cell gap is large, and the nutrient components in the fertilizer solution are easier to enter and are quickly absorbed. Therefore, when topdressing dicotyledonous crops, the front and back surfaces of the leaves must be uniformly sprayed. The monocotyledonous crop is sprayed with the fertilizer solution from the top down to the front of the leaf and moist. In addition, nitrogen, potassium, sodium and other elements in the crop body mobility, phosphorus, sulfur, chlorine, also have a certain mobility, and zinc, copper, manganese, antimony and other elements relatively weak mobility. For elements that are less mobile or unable to move, the foliar spray should focus on the new leaf. If sprayed on the old leaf, it will not achieve the desired effect.
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