1. Fertilizer. As a seed fertilizer, the applied fertilizer is generally applied to the lower part or the lower part of the seed in advance, and the fertilizer and the seed should be kept at an appropriate distance, generally 3 to 5 cm, to avoid burning the seed. Therefore, as a fertilizer for seed fertilizer, the depth of fertilization should be 5-6 cm.
2. top dressing. The root system of the plant has been initially developed when applying topdressing. If mechanical topdressing is used, the root should be minimized, the depth of fertilization is not too large, and the horizontal distance (side distance) from the plant should be appropriate. Under normal circumstances, between the line of topdressing, narrow crops such as wheat, the depth of topdressing is 6 ~ 8 cm, wide line crops such as corn, the depth of top dressing is 8 ~ 12 cm, the side distance is 10 ~ 15 cm should.
3. Base fertilizer. The action period of the base fertilizer is in the late stage of crop growth. At this time, the root system of the crop is mature, the plant is tall and dense, and the root zone top dressing is difficult to operate, mainly relying on the base fertilizer applied during the preparation of the soil before sowing. The bottom fertilizer is often 15 to 20 cm or more. Plowing bottom fertilization is a simple and easy way to do it. There are two main methods: one is to spread the fertilizer on the surface and then plow the soil into the soil; the other is to plow the fertilizer while applying the fertilizer to the furrow, that is, when plowing. Compared with the latter, the latter is excellent and should be strongly promoted.
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