The trend of “southern drought in the north†is aggravated. Most of the cotton areas in this year have more rainy weather, and the cotton fields have become deterrence. The cotton rotten bells may become an unfavorable factor affecting the high-quality and high-yield cotton. Therefore, it is time to do a good job of prevention and prevention. The cotton enters the looping period. The general year is susceptible to rotten bells in mid-August, late-September and late-September. The average incidence of cotton fields is 8% to 15%, and the severe plots reach more than 30%, which is the main threat to high-quality and high-yield cotton. .
Cotton is one of the important economic crops of farmers. It is both an important material for people's livelihood and a strategic reserve for the national economy. Therefore, a good grasp of cotton quality and efficiency, prevention and treatment of cotton rotten bell should be mentioned on an important schedule.
The main reason for cotton rotten bells is that cotton has more rainy weather, more rainfall, poor drainage, high humidity in the field, and high temperature and humidity in ridges, which can cause the breeding and reproduction of germs, and aggravate cotton rotten bells; nitrogen fertilizer application. Excessive growth leads to overgrowth of cotton plants, severe turbidity, and decline in resistance to disease caused by rotten bolls; boll diseases such as cotton bollworm, cotton bollworm, and corn borer cause serious occurrence of rotten bells. In recent years, with the popularization of insect-resistant cotton varieties and the popularization of mulching techniques, pest-resistant cotton bells have been concentrated early and the disease resistance is low. The mulch cotton is also prone to premature aging. Therefore, cotton rotten bells occur early, and There is aggravating, and in the event of rainy days, it will happen seriously.
How to prevent rotten bells:
"Two Controls": That is, nitrogen control and prosperous control. Control the growth rate of nitrogen in the middle and later stages of cotton growth. At present, most of the cultivated insect-resistant cotton, generally require the addition of a certain amount of base fertilizer and bud fertilizer, do not apply flower bell fertilizer, to prevent excessive growth, increased shade later. To control nitrogen and phosphorus supplementation, and apply foliar fertilizer. Such as: with 2 ~ 3% of the urea filtrate, 2% potassium dihydrogen phosphate solution, spray Shi Bao and other foliar spray; timely "chemical control" to prevent the cotton field Yu cover, prevent rotten bell. According to local conditions, chemical regulation should be carried out as early as possible. The general early flowering period and flowering period are the critical period for chemical control. Strong growth, rainy weather, after the cotton topping, prone to axillary buds, fruit branches prosperous, resulting in cotton field cover, causing rotten bell. In the first flowering period and 5 to 8 days after cotton topping, 45-80 grams of DHA is applied per hectare and the top of the plant is sprayed once; after 10 days of spraying, there are still prosperous plants, and DHA is used for each hectare. ~40 grams, can cover the top spray again. Mu spray liquid 50 to 75 kg.
"Two defenses": that is, prevention of depression and pest prevention. Pushing ridges and ridges to strengthen ventilation and light transmission and improve the microclimate in the field can effectively prevent the closure of cotton fields and control the occurrence and development of rotten bells. In high-density cotton fields, in the summer and autumn when there is more rain, the plants can be pushed and ridged 2 or 3 times to effectively reduce the humidity in the field, control the growth, and reduce the rotten bell; 75% chlorothalonil or 50% can be used in the middle and lower parts of cotton plants. The carbendazim WP 500 to 600 times, 70% thiophanate-methyl 1000 times spray, etc., can effectively prevent the occurrence of the rot Bell disease. At the same time, insect pests such as cotton bollworm, corn borer, and red bollworm should also be timely controlled.
"Two picks": The madness and old leaves were removed; sick bells and old bells were removed. Due to the overcast and rainy weather, the cotton grows too vegetatively, and it is easy to form madness and prosperous growth. The removal of madness, diseased leaves, and old leaves in time can effectively prevent the occurrence of the bell disease, and promptly raise the tip of the bunch, remove the bud, cut the empty branches, Removal of empty trees, etc. can improve ventilation and light conditions in cotton fields. The timely removal of sick bells, old bells, and concentrated drying of bolls is an effective method for the control of cotton rotten bells. Therefore, timely removal of sick bells and old bells in the middle and lower parts of cotton can effectively prevent and control rotten bells and reduce losses.
"Two sun": the drying sun trees, bells cooked. Before the arrival of the rainy season, we need to build a ridge for access to the drainage system; in case of heavy rain, we must remove water in a timely manner; after the rain is over, we must promptly push the strains and ridges, and when the soil is dry and hard, it can be ploughed. Surface soil, so that the ground, cotton plant in the lower part of the timely drying, in order to facilitate air and light, reduce the humidity in the field. In time, sick bells and old bells are removed and placed on the concrete floor or roof, covered with plastic film to increase temperature and ripen, improve the quality of boll opening and improve the quality of the fiber. You can also spray 100~300 times of 40% ethephon on the cotton boll, and then cover the sunning bell, the bolling quality will be better.
Ppe Gloves,Ppe Hand Gloves,Ppe Safety Gloves,Protective Gloves Ppe
HOLIK ASIA GROUP CO.LTD , https://www.holikasia.com