1, a reasonable fertilization
At present, most of the cultivated insect-resistant cotton, generally require a large amount of base fertilizer and bud fertilizer, do not apply flower bell fertilizer, to prevent excessive growth, increased shade. To control nitrogen and phosphorus supplementation, and with the foliar fertilizer. For example, spray with 2% urea and 2% potassium dihydrogen phosphate or other foliar fertilizers.
2, scientific irrigation
Moisture imbalance will hinder the metabolism and cause the bells to fall off. However, the flowering and bolling period coincides with the rainy season. Generally, irrigation is not required. The main concern is the drainage of cotton fields to prevent waterlogging and ensure that the cotton fields do not produce excessively high humidity. Avoid noon when watering.
3, timely control
Chemical control can effectively control leggy, improve ventilation and light conditions in cotton fields, reduce shedding, and increase production. Can be sprayed once before and after the initial flowering period, the amount can be sprayed 45-90 grams per hectare depending on the growth.
4, fine pruning
The fine pruning of the flower and boll period includes top-notching, axillary buds, group tips, and old leaves. It plays an important role in reducing the shedding of cotton buds, increasing ventilation, early maturation, and improving quality in cotton fields. Generally, in mid-to-late July, the top of the group can be grouped according to the effective flowering period of the local area at the appropriate time. The density can be divided and the cotton field can be divided. For shading cotton fields, old leaves and cut branches should be used early. The sequence of operations is the first branch after the main stem, the first after the lower part of the base. By pruning, create a group with reasonable air and light distribution and reasonable distribution of foliage.
5, cultivator soil
During flowering and boll season, the cotton fields are irrigated and soiled due to irrigation and precipitation, the soil is easy to compact, and the air permeability is poor. In addition, there are many storms and heavy rains in the cotton bolls period, resulting in the lodging of fallen bells. Therefore, before the storm comes, it is necessary to raise the roots of the earth and timely support the storm.
6, push the strain and ridge
For late-maturing gluttonous cotton crops, shaded cotton fields can be interlaced with cotton plants on sunny days to form ventilation channels between the rows, and after two weeks, the two rows of cotton plants in the ridges are pushed open. This can be alternately pushed to improve ventilation. Translucent conditions, favorable cooling, prevent rotten bells, promote premature.
7, control pests
The resistance of insect-resistant cotton to cotton bollworm was not as strong as that of the early stage, and bollworm and red bollworm often caused rotten bell. Therefore, measures should be taken to prevent and control it. Drug control can generally be used to kill, kung fu 450-900 ml per hectare of spray, or use cotton boiled Bao, Ling Ling Ling, etc. per hectare 600-900 ml, can also be used phoxim, omethoate and other spray control.
8, cure boll bell
The diseases that cause rotten bells mainly include red rot, pinkish pink, black fruit, and diseases. When the rotten bell appears in the cotton field, the 40% carbendazim suspension is used 800 times in time, and 90% of the original powder of diethylphosphorus aluminum 600 times or 70% of mancozeb zinc wettable powder 600 times can be sprayed. . Each spray of liquid 75-100 kg per acre, once every 10 days, even spray 3-4 days.
9, grab yellow bell
Picking up and picking up yellow bells is an effective measure to achieve non-bitter peaches and rotten peaches. Generally grasped in the yellow when the bell, picking in time, especially before the onset of rain is the most important grab.
10, hormone ripening
In the 15 days before the local frost, and most of the cotton bolls have been basically mature, spraying 500ppm of ethylene solution, 50 kg per mu, can be boiled earlier to reduce the rotten bell. But pay attention to spraying evenly, especially to the bell.
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