What are the fertilization methods for field crops?

Field crop fertilization methods generally have the following types:

(1) Spreading spreads the fertilizer evenly in the soil. The appalaching can be deep or form (shallow). The technique of deep application is to use a plough to plunge into the soil after spreading. Application applies to dense crops and fertilizers. The advantage of the application is that it is simple and the nutrients are absorbed by crops in all parts of the soil; the disadvantage is that the fertilizer is not used in a high efficiency because the fertilizer cannot be used by all crops and the weeds are fattened. The water-soluble phosphate fertilizer is in contact with the soil and is easily exposed to it. Fixed to reduce fertilizer efficiency, fertilizer dosage.

(2) Shi He points the application of fertilizer in the sowing ditch and sowing hole, or in the transplanting line and hole, called the Shi He points. Fertilizers can be applied under the seeds and can also be applied on one or both sides of the seeds. The following conditions are suitable for application and acupuncture:
1 less fertilizer;
2 large crop spacing;
3 Fertilizers that are easily fixed by soil, such as phosphate fertilizers;
4 The roots of the crop are poorly developed and the soil fertility is low.

The advantages of this method of fertilization are: the near roots of fertilizers, which are easily absorbed and utilized by crops, and therefore have a higher utilization rate of fertilizers; the contact surface between fertilizers and soil is small, the degree of fixation of nutrient elements is low, and the effective time is longer than the application.

(3) Spraying is external root fertilization.

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