Cotton Closing Period Should Be Done Well
The cotton boll-opening period management grasped "four cleverness" (fine grasping of fertilizer, clever pruning, skillfully picking up the rotten bell, cleverly ripening).
1, clever grasp of fertilizer and water to promote nutrient operation. One is top dressing. For premature chlorosis of leaves, cotton fields with premature decompensation appear, with 1% ~ 2% urea solution 50 ~ 60 kg per acre for foliar spray to extend the functional period of the leaves. For over-growth cotton fields that grow too late for lust, they can be sprayed with a 0.2% solution of potassium dihydrogen phosphate or a 0.3% solution of superphosphate soaked to promote nutrient flow and increase the amount of boll opening. The second is to prevent autumn drought.
2, clever pruning, push the plant to promote maturity. Due to temperature restrictions, the buds that are present after the beginning of the autumn and the flowers after the white dew are all invalid. The young part of the new cotton plant should be removed in time, which not only saves nutrients, but also reduces the damage of the fourth generation of cotton bollworm. In the closed cotton fields with severe canopy, due to poor ventilation, some of the redundant old leaves can be destroyed on the premise that 3 to 5 pieces of cotton leaves retain a cotton boll. It is also possible to push the plant and ridge, that is to say, the two adjacent rows of cotton plants are put together in a figure eight shape. After 5 to 7 days, they are pushed to both sides.
3, skillfully picking rotten bells to improve quality. After the picked bolls were dried in a 1% ethephon solution and then dried, cotton with good bolls could be obtained.
4, clever reminder cooked boil early. Ethephon sprayed in the appropriate period, cotton can be boiled about 10 days earlier, the flower rate before frost increased by 20% to 30%. During spraying, the cotton bolls in the upper part of the cotton plant should grow to more than 40 days and be about 20 days away from the frost period. The sprayed amount is generally 40% of 150 ml per mu, and 50 to 100 times of clear water is sprayed evenly. If the spraying is early, the temperature is high, and the cotton plants are weak, about 100 grams per mu can be sprayed. If rain falls 6 hours after spraying, re-injection is required (Note that spraying should not be applied).
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