What to Do When Cotton Is Flooded? Waterlogging Rescue Methods During Great Heat
Minor Heat and Great Heat fall in July, the hottest month of the year. Do a good job in flood control, heat prevention and drought resistance; harvest early rice in a timely manner; apply tillering and ear fertilizer to mid-season rice; carry out intertillage and soil loosening, topping, and flower fertilizer application for cotton; and control pink bollworm and cotton bollworm. Sow late-autumn crops in a timely manner. Ensure good ventilation and cooling for livestock and poultry pens to prevent heatstroke in people and animals.
Most cotton fields in our province are currently in a state of hidden waterlogging. This is currently the most critical period for cotton's transition from vegetative growth to reproductive growth, and also the most critical period for the increase of cotton buds and bolls. Emergency management measures must be taken immediately.
Deeply dig three ditches. Quickly drain standing water to reduce waterlogging in cotton fields. Dredge the field ditches and waist ditches in a timely manner. The outlet must be deep enough so that all water can flow into the branch ditches; drainage obstacles in the branch ditches must be cleared in a timely manner.
Fertilize according to field conditions. Cotton is currently in two states: first, the waterlogging-controlled type, and second, the rain-excessive vigorous-growth type. 1. Waterlogging-controlled type. This mainly refers to third-class seedling fields and cotton fields flooded for more than 36 hours. Quick-acting nitrogen fertilizer should be applied as a top dressing, with 10 kg of urea or 15 kg of diammonium phosphate per mu. 2. Rain-excessive vigorous-growth type. Long-term heavy rain inhibits the reproductive growth of cotton, vegetative growth becomes excessive, cotton plants grow leggy, and bud and boll shedding is severe. For rain-vigorous cotton, reduce the amount of fertilizer, especially quick-acting nitrogen fertilizer. Flower and boll fertilizer must be applied only after cotton growth weakens and each plant has set 1-2 large bolls. Because long-term flooding causes very serious loss of nitrogen, potassium, and micronutrient fertilizers in cotton fields, flower and boll fertilizer must be applied heavily. For flower and boll fertilizer, bury and apply 20-25 kg of urea, 15 kg of potassium chloride, and 1 kg each of boron fertilizer and zinc fertilizer per mu, mix evenly, and apply deeply in furrows. Combine fertilization with earthing up around the plants.