Prevention of "five pests" and "three seedlings" in cotton seedbed

The common problems in cotton nutrition bowl seedling bed are drought, stain, disease, fertilizer, medicine and frozen seedling, burning seedling and line seedling.

First, guard against the "five evils"

1. The water content on the bowl should be moderate. The nutrition bowl seedling bed should be selected in the place of drainage and irrigation, and the water content on the bowl should be dispersed as soon as it falls to the ground by hand.

2. After cotton is sown and covered with soil. Water enough at a time until it slowly seeps down.

3. After covering the film, it is necessary to ensure adequate moisture, do not uncover the film at will, and do not uncover the film until the seedlings come out.

4. Clear water and filtered water should be discharged around the seedbed so that the rain dries through the ditch.

5. In order to prevent and cure the disease, the nutrition bowl soil of the seedling bed and the fine soil covered after sowing should be disinfected with chemicals to prevent the bacteria in the soil from harming the cotton seedlings. Second, in addition to the disinfection of refined cotton seeds, those sown with hairy seeds and light seeds should be sterilized by chemical dressing. Carbendazim and topiramate can be used for soil and cotton seed disinfection. Third, after the cotton seedlings come out, Bordeaux liquid and other agents should be sprayed to prevent bacterial infection, but the dose should not be too large, let alone repeated spraying, in order to prevent drug damage.

Second, prevent the "three seedlings"

1. Anti-freezing injury: after the cotton seedlings come out, when the temperature stably passes through 12 ℃, you can first uncover the two ends of the seedling bed for ventilation and moisture refining, and then gradually uncover the seedlings to prevent the seedlings from flourishing and growing. When the temperature stably passes through 16 ℃, the film can be uncovered in the morning and covered in the evening, so that the pot does not transplant and the film does not leave the bed.

2. Prevent seedling burning: when the atmospheric temperature is above 20 ℃, the film should be open day and night, and the soil moisture should be watered. At the same time, advocate raising seedlings in big bowls, squatting seedlings in pan bowls, eliminating weak seedlings, controlling prosperity and promoting health, and striving for early stability.

3. Prevention of line seedlings: because seedlings are fattened and strong. After the cotton seedlings come out, those who grow well only need to be given fertilizer once, and those with insufficient base fertilizer need to be fertilized twice, the first time is mainly water dung, and the second time, 0.5% to 1.0% urea can be used to promote the small and catch up, so that the strong seedlings can get out of bed. However, the fertilizer concentration should not be too high each time, and it is better to be dilute, fast (effective) and fast.