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Low winter tubeworm production in cotton fields
Many cotton farmers do not pay attention to the winter management of cotton fields, and are accustomed to spring plowing and spring irrigation before sowing in spring. In fact, “whole fields in winter are good for cotton in the coming year; winter is a good place for plowing, and cotton is effortless; winter plowing and winter plowing, and insectless cotton production are high. "It has become an important measure of cotton production. To this end, cotton farmers should mainly do the following in winter: 1. Winter ploughing. Deep plowing in the winter in the cotton field can not only lift some of the raw soil, but also allow surface weeds and crop residues to be buried in the ground, allowing the soil to mature into a deep and loose layer of living soil. At the same time, winter plowing is an important measure to prevent and control cotton bollworms. Because, in the soil below 10 cm, the adult can not feather emergence. The depth of winter plowing is generally about 20 cm. In this way, most of the pupae turn into deep soils so that they cannot feather. Winter plowing can also turn some insects on the surface of the ground to be frozen or eaten by natural enemies. 2, winter wolfberry. Before the winter ploughing, it should be roughed once again, and after the ploughing, the larger ones should be removed. This will not only save water, but also kill some of the overwhelming insects. The bollworm is wintering in the soil with earthworms, and the depth is no more than 10 centimeters. The top layer is more than 6 centimeters. According to surveys, winter plowing in the cotton fields can suffocate about 80% of cotton bollworms. 3. Fertilization. Winter fertilization can be carried out at the same time as winter plowing. Generally, high-quality farmyard manure is used for 3 to 4 cubic meters, pure nitrogen is applied at 8 to 10 kilograms, and phosphorus pentoxide is 7 to 8 kilograms to promote the decomposition and ripening of organic matter. 4. Winter irrigation. After winter ploughing followed by winter irrigation, it will not only solve the contradiction between grain, cotton and water in the coming spring, but also increase the mortality rate of overwintering pupa. At the same time, the fertilizer nutrients applied can be infiltrated into the depths of the soil with water, which is beneficial to the absorption of cotton plants. Winter irrigation should be "uniform, full, transparent" principle, the amount of water is not easy to be too large, the time to freeze the day and night is appropriate. After thawing in early spring, it is necessary to loosen the land in time to increase the ground temperature and maintain the public opinion and ensure the quality of soil preparation. Practice has shown that not only cotton fields should be plowed during the winter, but other daylight areas should also be plowed in winter because other crops also have bollworms and overwintering pests.