Winter irrigation in cotton fields is good for water storage and fertilization, soil improvement, and elimination of overwintering pests. It is an important measure to promote cotton production. First, storing winter irrigated cotton fields can make the soil deeper to accumulate more water and play a role in winter water spring and winter water use. It ensures sufficient bottom sill at the time of sowing and is conducive to timely sowing, early emergence and seedling growth of cotton, and at the same time You can also adjust the water season to ease the spring water conflicts. According to experimental observation in Shaanxi Province, when the winter irrigation cotton field was sown, the water content in the soil from 0 to 90 cm was 2% to 3% higher than that from winter irrigation, and the cotton emerged 2 days earlier; from May to June, the winter irrigation was less than that of the winter irrigation. ~ 30 cm soil moisture content of 1% to 2%. 2. After winter irrigation in soil cotton fields, after winter and early spring freeze-up, soil tillage becomes loose and has good air permeability, which is conducive to the activity of soil microorganisms, thereby increasing soil aggregate structure and improving soil cultivability. Third, exterminated cotton fields have a large amount of water in winter and long time for water accumulation, and have obvious inhibition and lethal effects on the pests that overwinter in the soil. According to the survey, the winter irrigated cotton bollworm overwintering was reduced by 43.5% to 72.3% compared with the winter irrigated cotton field. According to other data, the wintering mortality rate of cotton bollworms is about 80% for winter plowing and winter plowing, and the wintering mortality rate is 60% to 70% for plots that have not been cultivated, and only 30% for non-irrigated plots. ~40%. 4. Increase Production Comprehensively Henan, Hebei and other provinces' early experimental data, winter irrigation and cotton fields in early spring irrigation, sowing temperature is 2~3°C higher than that before sowing, budding and flowering are 1 to 2 days earlier, and cotton yield increases by 5%. the above. The winter irrigation of cotton fields should be based on the principle that it is advisable not to delay. It is generally controlled when the surface begins to freeze or when it is frozen or decomposed at night. In the Yellow River valley, the winter season is appropriate from the late November to the end of December. Winter irrigation may be appropriate, generally less than 80 cubic meters per mu. Immediately after irrigation, the soil compaction was broken and water evaporation was reduced.
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