Some wheat varieties showed yellowing and dead seedlings after turning green. The possible causes of the yellowing of wheat leaves and their treatment measures are as follows:
1, the spring cold caused by the yellow wheat leaves. Due to the low rainfall in the province last winter and the severe drought in wheat, the wheat's stress resistance has been greatly reduced. After winter, wheat supplies its own stored nutrients to the heart and leaves. Because of the drought, it affects the photosynthesis of wheat and the supply of nutrients is insufficient. Especially, the sugar and other nutrients in the leaf that are exposed to space are scarce and naturally suffer from freezing and freezing in the event of cold. The same variety, due to different cultivation conditions and environment, led to different developmental processes of wheat, and also resulted in differences in degree of frost between plots.
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. The following processing can be taken:
The first is to strengthen fertilizer and water management according to the situation. If the base fertilizer is adequate, water has been poured after the year, and the field is not very dry. The main crops should be ploughed to promote the growth of wheat seedlings. If the base fertilizer is insufficient, there will be no watering after the year and severe drought in the field. The management of fertilizer and water shall be strengthened in a timely manner. If water is poured on the surface, the amount of water can be appropriately increased. Fertilizer is applied before watering. Fast-acting fertilizers such as ammonium bicarbonate and ammonium sulfate are the main components. Slow conversion of urea at low temperatures should not be used. Appropriately added potassium fertilizer to promote the growth of wheat seedlings. If groundwater is poured, sprinkler irrigation may be best if conditions permit, and small flow rate shall be used if there is no sprinkler condition. Watering should be done immediately after watering.
The second is to pay attention to pest control. After wheat is frozen, the disease resistance is reduced. Spring is also the season of disease. In addition to aphids and red spiders, add appropriate amounts of carbendazim and other disease-resistant drugs.
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. Yellow wheat seedlings caused by effluent poisoning may behave differently due to different toxic components. Some may show symptoms soon after pouring, and some may show symptoms only after several days. Once poisoning occurs, toxic components are complex and it is difficult to have effective remedy. Therefore, minimize the use of wastewater that has just been discharged from the company.
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. It is recommended to take samples to the local agricultural technology and plant protection department for advice and symptomatic treatment.
Tuberculosis (TB) is a potentially fatal contagious disease that can affect almost any part of the body but is mainly aninfection of the lungs. It is caused by a bacterial microorganism, the tubercle bacillus or Mycobacterium tuberculosis.Although TB can be treated, cured, and can be prevented if persons at risk take certain drugs, scientists have never comeclose to wiping it out. Few diseases have caused so much distressing illness for centuries and claimed so many lives.
Tuberculosis
Medicine For Tuberculosis,Streptomycin Tuberculosis,Kanamycin Tuberculosis
NOUVASANT PHARMhealth LTD. , http://www.nouvasant.com