Yellowing tip is one of the most common diseases occurring in the cultivation process of shed leeks. The reasons for its occurrence are summarized as follows:
1. Drizzle. The excessively high concentration of the drug may easily lead to the sharp tip of the leek leaves.
2. Too much nitrogen fertilizer. If urea is applied excessively in the shed, it will easily cause ammonia damage to the leaves. If the amount of nitrate nitrogen is too much, it will easily cause nitrous acid damage and make the leaves yellow and dry.
3. Excessive winds. In the case of high temperatures in the shed, if you suddenly open a large vent, it may cause the blades to dry and yellow.
4. Related to the characteristics of the species. Snow cultivars, Xiaogenhong and Hanzhong winter cultivars are easy to produce dry tips in open-air cultivation in summer and autumn, but this situation rarely occurs in winter cultivation.
Solution: 1. Pay attention to medication before the shed, and control the optimal dosage to avoid the sprouting time of leek so as not to damage the leek sprouts.
2. The application amount of urea per hectare is generally controlled below 12 kg. In addition, the application of organic fertilizer or humic acid fertilizer to root and raise the growth of leek. Use as little or no nitrate nitrogen as possible.
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