Winter wheat easy to die
In recent years, the phenomenon of winter dead seedlings has been increasing year by year, which has affected the increase of wheat yield. To sum up, there are no more than six reasons. Therefore, farmers' friends can take early and effective measures to prevent winter wheat seedlings and reduce disaster losses according to the reasons why wheat is dead in winter. Causes of winter wheat seedlings Cold freezing injury. Low temperature is the main cause of winter wheat dead seedlings, which causes the wheat seedlings to freeze too fast and thaw too fast. In this alternating freeze-thaw cycle, the wheat seedlings are too late to adapt, causing physiological function to decline, leading to the death of wheat seedlings. Cold and freezing damage. In winter, the frozen soil layer is very thick, the soil moisture is frozen, the root system can not absorb water from the soil, or the water absorption capacity is weak. The wheat straw stems and leaves are still transpiration and water loss, which causes the water supply and demand in the wheat plant to lose balance, which causes the wheat to dehydrate and die. Dense broadcast Wang Miao. Early sowing, seeding large amount of wheat, wheat seedlings caused by crowding after the delivery of winter, the group is too large, poor ventilation and light fields, the individual growth is weak, the accumulation of organic nutrients is less, can not meet the winter wheat needs, resulting in winter dead seedlings The wheat varieties with poor frost resistance are more serious. Straw returned to the field. In the wheat field where straw is returned to the fields, loose soil and easy access to cold air can easily lead to the occurrence of winter wheat injury. Winter irrigation late. One is that wheat has a higher water content in the body, which can easily cause icing and dead seedlings in the case of cold currents. Second, the ground is cracked in the frozen soil layer, the root system is broken, cold air enters the bottom of the soil layer and dead seedlings; the third is the soil lower layer knot. Ice, water can not be infiltrated after watering, surface ice, over time, soil hypoxia, wheat suffocation died. Remedies for winter dead seedlings of wheat Transplanting seedlings, thinning and thinning for the winter dead seedlings caused by lack of seedlings and ridges, can be used immediately after the return of green wheat by thinning method of thinning for transplanting. For wheat seedlings that are still white or green in the tillering section, it is not necessary to use seedlings for transplanting. Foliar fertilization, supplementary nutrition Wheat suffered freezing injury, it is necessary to pay attention to spray 1 or 2 times humic acid foliar fertilizer, supplement wheat nutrition, promote the recovery of wheat as soon as possible.
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Drought in the soil. Soil moisture is poor, and plants do not receive sufficient water supply during the winter wheat season. In particular, in the years when the weather is variable, windy and cold, wheat seedlings die due to drought and water shortage.
By removing dead leaves and increasing the dry-leaf cover of photosynthetic dead seedlings, the remaining green leaves are also covered by dry leaves, affecting the photosynthesis of wheat. When the temperature rises in the spring and the topsoil is melted, the buckwheat buckwheat ridge leaves should be used. , to promote the growth of the heart.
Topdressing nitrogenous fertilizers to promote the growth of wheat seedlings after rejuvenation as early as possible 25 to 40 kg of ammonium bicarbonate, or 10 to 15 kg of urea available nitrogen fertilizer, to promote the wheat as soon as possible rejuvenation.
According to local conditions, timely watering for wheat transplanting seedlings, fill the seedlings should be timely watering. Without supplementing the seedlings, it is not necessary to water it prematurely. It should be based on the ground temperature and soil moisture. It is generally controlled at 5 cm after turning green. When the ground temperature is stable at 5°C, it should be watered. The amount of water should not be too large. Light water should be poured on the ground. The land with good sensation can postpone the watering time appropriately.
The ploughing and ploughing, warming and protecting the wheat field after the surface soil is frozen, early ploughing and hoeing, loosening the soil, warming and protecting the ridge, promoting the early and early emergence of the wheat seedlings, increasing tillering, and increasing the rate of succession. 