The base fertilizer applied before or at the time of planting is insufficient. The seedling stage shows poor growth potential, the leaf speed is slow, the compound leaves appear late, or the small leaves are thin, the leaves are light green, and the stems are thin. The top dress should be applied as soon as possible.
The research results show that the top dressing should be carried out in the Qimiao to the group. This will enable the fertilizer to exert its fertilizer effect as early as possible, so that the plant can reach the nutrients needed for normal growth and development. After the top dressing, the fertilizer effect plays a role in the late stage of the hair growth, which is easy to cause the phenomenon of long or late tuber swelling, late maturity, etc., which is unfavorable for the early-maturing early-maturing varieties and early morning harvest.
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