Winter wheat dead seedlings have been plaguing farmers' friends. The appearance of wheat dead seedlings has seriously affected the yield of wheat. Why does winter wheat die? Is there any way to prevent it? This article will explain in detail why winter wheat is dead. And preventive measures.
First, the cause of death
Internal factors: If wheat varieties with poor cold resistance and drought resistance are used, the phenomenon of dead seedlings is likely to occur in case of freezing damage. The cold-tolerance ability of wheat seedlings that are prematurely planted and pre-wed to differentiate into two-edge stage is weak, and the dead seedlings are severe when frozen. In addition, some late-wet weak seedlings have less sugar accumulated by themselves, and they are prone to dead seedlings in case of cold damage and drought.
External factors: less precipitation in summer and autumn, insufficient soil bottom, less rain and snow in winter, more cold wind, will aggravate soil drought, leading to physiological dehydration and death of wheat. If the seeding is too late, too deep or too dense, it is easy to form weak seedlings, which is not conducive to the safe wintering of wheat. If the winter water is not timely poured in the case of insufficient bottom sputum, it will easily lead to the death of the seedlings.
Second, preventive measures
In the selection of cold-resistant varieties, it is necessary to understand the adaptability of the varieties when introducing them. Considering their yield, they should also consider their cold resistance. The selected varieties must be safely wintered in most local years.
Irrigation at the seedling stage For early-sown wheat fields with insufficient saplings, watering can be carried out in the tillering stage, and a small amount of chemical fertilizer is applied in the case of insufficient soil fertility to promote seedling growth and ensure the safe wintering of the seedlings. For the late-sown wheat field, the soil temperature should be raised and the soil moisture should be kept. The seedling stage should not be watered, otherwise the ground temperature will be lowered, and the soil can be ploughed and the seedlings can be improved.
Timely winter irrigation and winter irrigation is not only conducive to wintering and seedling protection, but also can alleviate the adverse effects caused by cold damage, drought damage and temperature changes in early spring. It is an important measure to prevent winter and spring wheat seedlings. It is advisable to pour the winter water to the night and the temperature is 4 °C. For the wheat field with a large amount of straw returning, winter water must be poured to crush the soil mass and freeze the pests.
Appropriate suppression, covering the cracks can break up the soil mass and solidify the soil, so that the wheat roots and the soil can be tightly combined to promote root development. Sanding in the winter and breaking the soil cover wheat can deepen the depth of the tiller and protect the leaves of the near-surface layer, reduce the evaporation of soil moisture, improve the water condition at the tiller joint, and play the role of heat preservation and antifreeze.
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