Detailed Explanation of Key Techniques for Cotton Plastic Film Mulching Cultivation

Cotton plastic film mulching has the characteristics of stable yield, high yield, high quality and economic efficiency, with seed cotton yield per mu reaching over 100 jin. The main cultivation measures are:

1. Carefully prepare the land, choose plots with deep soil layers that retain fertilizer and water, make beds 60-70 cm wide and 8-10 cm high, and repeatedly press them twice with a wooden roller.

2. For seed treatment, sun the seeds, strictly select grains, delint with sulfuric acid, conduct germination tests, and soak the seeds in cold water before sowing.

3. Sow at the right time, with the best sowing period from April 25-30, maintaining 7500-850 plants per mu, and cover with film while sowing to avoid moisture loss.

4. Scientific fertilization: apply 3000-4000 kg of farmyard manure per mu, 50-80 kg of ammonium sulfate, 15 kg of phosphorus, and 5-10 kg of potassium fertilizer. The application method should be mainly base fertilizer; 1/3 of the nitrogen fertilizer should be applied below 10 cm and the rest can be used as topdressing. Applying too much chemical fertilizer at once can cause seed burning and bud rot.

5. Strengthen management: use pyrethroid pesticides mixed with water, apply 3000-5000 times dilution to control cotton bollworm, which can also control cotton aphids at the same time; do a good job of cotton pruning, top the plants on July 5-10, aiming to keep 6.5-7.0 ten thousand fruit branches per mu, start tipping the side branches on July 15, leaving 2-3 fruit nodes on each fruit branch; spray mepiquat chloride on July 5-10; when less than half of the bolls have opened by September 20, promptly spray ethephon to promote ripening.