Affected by the rainy days before sowing and the late harvest of corn, it can cause the wheat to be planted later than normal, even for frosty wheat. The wheat seedlings before winter are generally weak and small, and the problem of wheat fields is prominent and the seedlings are complicated. The wheat seedlings are weak, the nutrient accumulation in the body is small, the cold-resistant and anti-freezing ability is weak, and the winter and spring are susceptible to freezing and killing. Therefore, due to the appropriate conditions for seedlings and timely follow-up, it is indeed necessary to take effective and comprehensive measures to strengthen the management of wheat fields before winter and winter sowing, to ensure that winter wheat is safely wintered.
Prevention and control of pre-winter pests and diseases The late-sown wheat has many basic seedlings, high density, late development, and is vulnerable to pests and diseases. In the seedling stage, root and disease diseases, underground pests and autumn mites were found to be harmful to the pests and diseases, especially in the wheat fields where no coated seeds or chemical dressings or soil treatment were used. Control measures such as toxic soil, root irrigation and spraying should be taken in time. Wheat field removal can be carried out in the fall or early spring. It advocates chemical weeding in autumn, with good effect and high safety. It is implemented in sunny days with wheat 3-5 leaf stage, weed 2-4 leaf stage and daily average temperature above 5 °C.
Early wintering and light watering are the most effective methods for ploughing the soil after the straw is returned to the field. The wintering water of the straw returning field is moved to the 3rd leaf stage, and the night freezing is completed before the end of the year. The annual acreage is 30-40 square meters. Special attention: late sowing of weak seedlings, especially wheat sown after frost, generally not dry or winter, so as not to reduce the ground temperature, affecting the emergence of seedlings.
Strengthening the fertility characteristics of field tillage management and late sowing wheat: the growth period before winter is short, and the accumulated temperature is small. The performance is “one small three, one light and one lightâ€. The seedlings are small, the leaves are few, the secondary roots are few, the tillers do not occur or occur less, and the plants are dry. Fresh matter is light. The main factor affecting the early growth of wheat is the ground temperature. Therefore, in management, the principle of keeping warm and warming should be promoted to promote early emergence of wheat seedlings. The last time before freezing or raking, you should pay attention to the roots of the earthworms, or cover the "heads of manure" to protect the wheat seedlings from winter. It is strictly forbidden to graze indigo in the wheat field in the winter.
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