Several technical measures to be taken after cotton topping in July
1. Scientific control
1. Depending on growth regulation
After the cotton is topped, it is generally controlled for 1 or 2 times. For the first time, three to five days after topping, the fields with 667 square meters of seedlings with about 12000 plants were given 4 grams of propranolol and 30 kilograms of water, while the fields with more than 16000 plants were given 6 grams of thalidomide and 40 kilograms of water. The second chemical control depends on the ontogeny and population size of cotton plants, and moderate re-control is carried out according to the weather, soil moisture and cotton plant growth, generally 667 square meters of about 8 grams of propofol. Through the effect of propranolol, we can effectively control the growth tip of invalid flower buds and empty fruit branches, realize the transformation from vegetative growth to reproductive growth, shape the growth appearance of balanced yield, and ensure the increase of boll number and boll weight at the top of cotton plants. to create conditions for high yield.
two。 Spray properly
The correct way to spray propranolol is to first dissolve it in a weighed basin or plastic bucket container, stir it fully, and add it to the sprayer according to the amount of thalidomide per 100 grams of acetylamine aqueous solution.
Spraying propranolol should grasp the principles of evenness and dissatisfaction, high spray but not low spray, spray prosperity without spray failure, and the best spray should be carried out after 5: 00 p.m. Spraying under high temperature and strong light will reduce the effect, rain within 6 hours after spraying will affect the absorption effect, large rainfall for a long time will be ineffective, need to re-spray.
Second, irrigation according to local conditions
After topping, cotton enters the peak period of reproductive growth, and flowers, buds and bolls are gradually formed. this stage is the stage in which cotton needs the most water in the whole growth period. in the cotton field under conventional furrow irrigation, the first water should be less and the second water should be full. three and four water should be sufficient (three and four water is the two water after topping). The water must be stopped before August 15 to prevent cotton plants from ripening late.
Third, look at the appearance to replenish the fat.
Cotton needs more water and fertilizer after topping. In the cotton field under conventional irrigation, different amounts of nitrogen, phosphorus and potassium fertilizer should be applied according to the appearance of branches and leaves of cotton plant after topping, 5kg / 667 square meters. At the same time, increase the spraying of foliar boron fertilizer, 50 grams of Suele boron is dissolved in 50 kilograms of water spray every 667 square meters, a total of 2 times, in order to improve the boll setting rate.
IV. Timely harvest
After opening catkins, we should adhere to the "three whiteness", and achieve graded flower picking, graded heap drying, graded selling, to ensure cotton quality and quantity, high yield and bumper harvest.
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Short-spike Cuttage Seedling technique of White Tea
White tea seedlings are generally raised by asexual short-spike cuttings. Experiments show that when white tea is raised with tea seeds, its offspring show character variation, that is, there is no periodic whitening in spring, and short-spike cuttings can maintain the characteristics of female parents. the progeny has the same characters, high reproduction coefficient and high survival rate. Considering the economic benefits of white tea, at present, there is no special mother garden, but both the mother garden and the picking garden. The cutting time is generally from September to October in autumn, during this period, the cuttings grow roots quickly, the seedling rate is high, and the management is short at the same time, which is favorable.
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Potassium should be sprayed on cotton leaves in August
As the content of available potassium (including water-soluble potassium and available potassium) in soil is decreasing year by year, available potassium has become the first major demand of cotton nutrition physiology. When 30 jin and 40 jin of high quality potassium fertilizer was applied to the base fertilizer, due to the consumption of cotton growth and development and the leaching after heavy rain, the content of available potassium in the soil would decrease to the original level in August. In August, with the deterioration of soil permeability and the decrease of soil temperature after ridge closure, soil potassium supply capacity is weakening day by day. If potassium fertilizer can not be replenished in time, it will show obvious potassium deficiency.
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