There are generally the following types of fertilization methods for field crops:
(1) Spreading is to spread the fertilizer evenly in the soil. The application can be applied in depth or in the form of shallow application. The technique of deep application is to use the plow to plunge into the lower layer of the soil, and the surface application can only be used. The application of crops for dense values ​​and the application of large amounts of fertilizer. The advantage of the application is that it is simple, and the nutrients are absorbed by the crops in all parts of the soil; the disadvantage is that the fertilizer utilization rate is not high, because the fertilizer can not be fully utilized by the crop, and the weeds are fattened, and the water-soluble phosphate fertilizer is excessively contacted with the soil, and is easily Fixed to reduce fertilizer efficiency and large amount of fertilizer.
(2) Applying and applying the fertilizer to the seeding ditch and the seeding hole, or applying it to the transplanting line and the hole is called Shi Shihe. Fertilizer can be applied to the bottom of the seed or to one or both sides of the seed. The following conditions are suitable for the application and application:
1 less fertilizer;
2 the crop spacing is large;
3 fertilizers that are easily fixed by the soil, such as phosphate fertilizer;
4 The root system of the crop is poorly developed, while the soil fertility is low.
The advantage of this fertilization method is that the fertilizer is close to the root and is easily absorbed and utilized by the crop, so the fertilizer utilization rate is high; the contact surface of the fertilizer and the soil is small, the nutrient element is fixed to a low extent, and the effective time is longer than the application.
(3) Spraying is applied externally.
(1) Spreading is to spread the fertilizer evenly in the soil. The application can be applied in depth or in the form of shallow application. The technique of deep application is to use the plow to plunge into the lower layer of the soil, and the surface application can only be used. The application of crops for dense values ​​and the application of large amounts of fertilizer. The advantage of the application is that it is simple, and the nutrients are absorbed by the crops in all parts of the soil; the disadvantage is that the fertilizer utilization rate is not high, because the fertilizer can not be fully utilized by the crop, and the weeds are fattened, and the water-soluble phosphate fertilizer is excessively contacted with the soil, and is easily Fixed to reduce fertilizer efficiency and large amount of fertilizer.
(2) Applying and applying the fertilizer to the seeding ditch and the seeding hole, or applying it to the transplanting line and the hole is called Shi Shihe. Fertilizer can be applied to the bottom of the seed or to one or both sides of the seed. The following conditions are suitable for the application and application:
1 less fertilizer;
2 the crop spacing is large;
3 fertilizers that are easily fixed by the soil, such as phosphate fertilizer;
4 The root system of the crop is poorly developed, while the soil fertility is low.
The advantage of this fertilization method is that the fertilizer is close to the root and is easily absorbed and utilized by the crop, so the fertilizer utilization rate is high; the contact surface of the fertilizer and the soil is small, the nutrient element is fixed to a low extent, and the effective time is longer than the application.
(3) Spraying is applied externally.
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