Tips for correct handling of yellow and dry tips

The correct handling technique for the yellowing and dry tip of the leek leaf tip:
1. The concentration of the drug in the early germination period of the phytotoxicity is too large, which may lead to the dry tip of the blade.
2, urea, nitrate nitrogen, etc. The maximum limit for the use of urea per mu is about 12 kg. If the urea used in the arch shed is too large, it is easy to cause ammonia damage to the leaves; nitrate nitrogen and ammonium nitrogen Excessive dosage can easily cause damage to nitrous acid, making the leaves yellow and dry. It can be determined by using PH test paper to detect the acidity of dew.
3, the wind is too large in the case of high temperature in the shed, if you suddenly open the large air vent, it may lead to the dry tip of the blade, the tip of the leaf yellow.
4, related to the characteristics of the species, such as ferrets, small root red, Hanzhong winter glutinous rice and other varieties are prone to dry tip phenomenon in summer and autumn, but this situation does not occur in winter protected area cultivation.
Solution: 1. Pay attention to the medicine before the shed, and control the optimal dosage, avoiding the germination time of the leeks, so as to avoid the germination of the leeks. 2. The amount of urea used should be controlled below 12 kg. In addition, organic fertilizer or humic acid fertilizer is applied to promote root growth and increase the growth of amaranth. 3. The nitrate nitrogen fertilizer should be applied as little as possible or not.