From July to September each year, droughts and autumn droughts often occur, hindering the normal growth of cotton plants, resulting in a large number of flowers, buds, peach off, seriously affecting the formation of cotton production. Therefore, watering the cotton fields in time during the drought facilitates the normal development of the cotton plants and captures high-yielding cotton harvests. The anti-drought in cotton fields should be a good "three levels."
Drought resistance indicators Whether the cotton field needs drought can be determined from the following aspects. The first is that there is no rain for 7 to 10 days in a row, and the field soil water capacity is less than 60%. According to cotton water requirement, the cotton water requirement during the flowering and bolling period accounts for more than 50% of the total growth period. More than 75% of the water evaporates through the leaves to the atmosphere. Generally, the daily water consumption is about 3 cubic meters per mu, and is 0 to 80 cm. The soil moisture within the field is suitable for 70%-80% of the field water capacity, and less than 55% is insufficient water supply. The second is the slow growth of cotton plants. That is, "three slow ones" appear, namely, the growth of the top buds is slow, the top branches are born slowly, the new leaves are stretched slowly, and the heart leaves (the first flat branches of the top branches) increase. The daily growth of the main stem dropped to about 1 cm. Third, the stem ratio of the main stem rose rapidly to more than 90%. Fourth, the leaves became smaller and thicker. Noon appeared wilting and the leaves were dark green. The main ones looked at the upper 1 to 3 pieces of cotton leaves. If there were dark green bands or dark days, there was wilting and drooping at noon, indicating severe drought. The fifth is that the young part of the top of the cotton plant is less than 10 cm, and the positive side is weakened. Sixth, the speed of flowering is accelerating.
One of the drought-resistant methods is trickle furrow irrigation. Clean up the irrigation ditch and the car ditch in advance to ensure that the irrigation and drainage are connected. Water conditions in a good cotton area, you can lift the water trickle irrigation, flood irrigation is strictly prohibited, to be a thorough irrigation, the general water irrigation to the pit 2/3, so that the ditch in the water surface dry. If the irrigation conditions are poor, you must also quickly fill the fast row. Each time the water is used to moisten the root layer of soil, generally 40 to 60 cm soil layer in the inflorescence stage, 50 to 60 cm soil layer in the mature stage, and the flowering period is 30 to 50 cubic meters per mu. It is 50 cubic meters. The second is to use water to water and water directly to the root of each cotton. However, the amount of water must be poured into the water. Irrigation time is in the dry season. Irrigation time should be chosen from 4 pm to 10 am the next morning. The high temperature at noon and the temperature drop after irrigation will cause a large number of budding bells to fall off.
After irrigation, management and irrigation should promptly strengthen field management, pay close attention to cultivator loose soil, prevent cotton and soil compaction, so as not to affect the development of roots, combined with cultivator can be ridge cultivation, reduce water evaporation. Combine drought resistance with 15 kg of urea or 20-25 kg of compound fertilizer to meet the needs of cotton plants for nutrient growth. Where conditions permit, cotton grass cover can be implemented to store water, protect fertility, increase fertility by high temperature, and relieve drought. Combined with pest control, 1%~2% urea plus 0.3% potassium dihydrogen phosphate and “802†4000 times solution can be applied. Spray 1 or 2 times to promote cotton root growth and absorption of fertilizer and water, and increase boll weight and rate of ringing.
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