Rainy days have an adverse effect on cotton growth and at the same time facilitate the occurrence of cotton diseases and insect pests. Therefore, it is necessary to strengthen the management of cotton fields, pay close attention to the occurrence and development of cotton field diseases and insect pests, and control them in time.
Timely drainage: low-lying cotton fields are prone to water accumulation. After rain, waterlogging should be drained in time to minimize the time for cotton fields to be flooded. Clean up and dredge the drainage ditches of cotton fields, quickly and effectively reduce soil water content and eliminate cotton field waterlogging.
Grabbing cotton plants: For cotton fields that have fallen down due to storms, in order to reduce losses, the cotton plants must be lifted up in time. When the soil in the cotton field is not dry or wet, the cotton plants should be supported to promote the recovery of cotton plants. Righting method: You can gently lift the cotton plant upright from the Shangfengguan, and cultivate the soil and protect the root on the stem. Do not use too much force or one time to prevent man-made mechanical damage.
Supplementary fertilizer: At present, the cotton field is in the flowering and boll period, and is in the peak period of fertilizer demand. A lot of rainfall causes serious leaching of soil nutrients, so supplementary fertilizer is required. When the soil moisture is adequate in the field, apply fertilizer in time, generally use 10-15 kg of urea per mu, and add 7-10 kg of potassium chloride. It can play a role in increasing stamina, preventing premature aging, promoting weight gain, and reducing boll shedding.
Timely prevention and control of pests and diseases: the blind stink bug, third and fourth generation cotton bollworms, etc. are the main targets to strengthen the control, and sulfonamid, carbofuran, methomyl, malathion and other agents can be used for control. In application, it is recommended to use agents with different insecticidal mechanisms and different modes of action, such as contact agents and systemic agents, which can effectively improve the control effect.
Prevention and treatment of blind stink bugs: Blind stink bugs are more active at night and when there is less sunlight. In actual production, the application time should generally be controlled after 4 pm. At this time, the blind stink bugs are mostly distributed on the surface of the young and tender parts of the cotton plant. The control effect is better. At the same time, the photolysis of the agent is reduced in a certain period of time. In Chengfang contiguous cotton fields, it is necessary to unify the medication time and act in unison. When spraying, spray the outer area first, and spray the pesticide along with the weeds on the side ditch of the cotton field and the road to concentrate on annihilation and prevent migration. For a single cotton plant, spray it up and down evenly and thoroughly.
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