1, seed fertilizer. As a seed fertilizer, the applied fertilizer is generally buried in the lower part of the seed or in the lower part of the seed. The fertilizer and the seed should be kept at an appropriate distance, generally 3-5 cm, so as to avoid burn seed. Therefore, as fertilizer for fertilizer, the depth of fertilization should be 5-6 cm.
2, top dressing. When applying topdressing, the roots of the plants have been initially developed. If mechanical topdressing is used, rooting should be minimized. The depth of fertilization should not be too great, and the horizontal distance (sideways) from the plants should also be appropriate. Under normal circumstances, top dressing, narrow rows of crops such as wheat and other topdressing depth of 6-8 cm is appropriate, wide rows of crops such as corn and other top dressing depth of 8-12 cm is appropriate, lateral distance of 10-15 cm is appropriate .
3, base fertilizer. The role of the base fertilizer is in the later stage of crop growth. At this time, the roots of the crop have matured, the plants are tall and dense, and the top-dressing is more difficult to operate, and the main fertilizer applied at the site preparation before planting plays a role. Base fertilizers are often 15-20 cm deep or deeper. Plowing fertilization is a simple and easy way. There are two main methods: One is to spread the fertilizer on the ground and then plow it into the soil; the other is to apply the fertilizer to the furrow at the same time as the ploughing operation, that is, when the ploughing is applied.
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