1, the spring cold caused by the yellow wheat leaves. The yellowish leaves of wheat are generally characterized by the yellowing of the chilly spring leaves. A few days before the yellowing, the wheat seedlings are green and blue, and the leaves suddenly turn yellow, and the yellowing is even, and the yellow spots are not yellow. In another case, a part of the blade (most of which is in the middle of the blade) is frozen to death, and when the weather is warm, the blade is folded off from the frozen part. This is caused by the special climate that forms a low temperature layer at this location. In general, it is not very severe cold before the booting, and strengthening management has little effect on the yield.
2. The leaves caused by insufficient fertilizer and water are yellow. The base fertilizer is insufficient, especially nitrogen deficiency. The main performance is wheat seedlings are thin and yellow. The yellowing of wheat seedlings caused by lack of fertilizer and water is not as yellow as the freezing injury. Due to the difference in field fertility, the degree of yellowing is uneven, and some parts are yellow and some are light.
3. Yellow seedlings caused by sewage poisoning. At present, most of the water deposited on the ground is discharged by enterprises and residents. The chemical composition of water is extremely complicated. In particular, corporate wastewater, most of which contains organic matter, heavy metals and other harmful substances. This phenomenon may sometimes occur. Wheat irrigated with the same sewage source, some wheat seedlings are damaged, and some wheat seedlings are not seen to be affected. The reasons are related to the irrigation time, the management of wheat seedlings, and wheat varieties.
4, drug poisoning. The main cause of poisoning in wheat seedlings is herbicides. Herbicides are different from pest-control pesticides. They require strict requirements, and they may cause phytotoxicity if they are carelessly used. For example, herbicides for broadleaf weeds cannot be used on wheat seedlings. Also, herbicide concentrations should be strictly controlled. Once phytotoxicity is caused by herbicides, there is no effective way to rescue the dead seedlings of wheat. Therefore, care must be taken when using herbicides.
5. Diseases and insect pests caused by dead leaves of wheat. In recent years, wheat root rot and sheath blight have rapidly developed, and the area of ​​disease has continued to expand, and the incidence has been increasing. Diseases and insect pests caused by the dead leaves of dry leaves of wheat are generally in the form of flakes. Http://
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