Cotton topping technique essentials
Topping is the central part of the cotton pruning work. Through the top of the heart, it can eliminate the top growth advantage of cotton and regulate the transportation direction of the water nutrient and other substances in the body, so that more nutrients are provided for the growth of reproductive organs, reducing the effect of no effective branch on water and fertilizer. , To promote early bolling of cotton plants, more bells, reduce loss, etc., have obvious effect of increasing production and income. First, the time of cotton topping Through years of experiments and production practices, the key to the topping effect lies in the time and method. Topping is too early, the upper fruit branches grow strong, making the cotton plants form umbrellas, the shade of the field is aggravated, the air and light transmission are poor, the rotten bells are increased, the axillary buds are clustered, the pruning work is increased; the topping is too late, the ineffective buds increase, Delayed maturity has resulted in lower quality of cotton production. Therefore, the time for the top-down must be timely, and we must follow the principle of "when it's not equal, when it's time to wait, it's time to wait." The determination of the timing of timely top-down is mainly based on the growth of cotton plants, soil strength, density, variety, and fruit branch number. From the growth and development stage of cotton, it takes more than 65 days from flowering to boll opening. For this reason, the time for the top of the frost should be about 80 days before the beginning of the frost period. From the standpoint of cotton growth, if the top of the cotton plant is lower than the top one to two, the topping of the leaves will be early. If the top of the heart is higher than the top two leaves, the topping will be late. The top of the heart is equal to the top two leaves. Topping is timely. The farming magistrate said well: "Cavity is early for playing, and late for playing. Pingding is just right." Generally speaking, cotton fields with weak growth, high density, and poor fertility should be given early advancement. On the contrary, they have strong growth and low density. In good cotton fields, the time for topping should be postponed. Second, topping method In the method of topping should be used to play a small top method, that is, to fight a leaf, and avoid the "big handle" play. It is necessary to first hit a weak land and then use a strong cotton field. In the same land, you should knock out all the tops of a tree. It is not advisable to fight in batches in order to prevent missing trees. Because the top of the cotton plant is a site where insect pests such as cotton bollworm and cotton aphid are concentrated, the top of the plant should be concentrated and brought out of the field to effectively reduce insect damage. After 5 to 7 days of topping, that is, after the top fruit section extends 2-3 knots, 8 to 10 grams per mu is used to reduce the occurrence of axillary buds, and the shooter sprays 30 to 40 kg of clear water. Good plant shape and good yield. Third, the technical measures after cotton topping First, as the growth and control of cotton topping, the general control of 1 to 2 times. Weak growth, high density, poor fertility, budding, flowering to the top of the cotton, the first time after the top 5-7 days, mu ghreta 4 ~ 5 grams, watered 30 kilograms of chemical control, the second time The chemical development of cotton plants as a result of the ontogenesis and soil moisture was moderately re-controlled 5-7 days after the first chemical control. Generally, about 6-8 grams of dimethoprim was improperly conditioned, vigorously growing, and fertilized. Adequate cotton, mushi 5 ~ 6 grams of condensation amines, watered 40 kg. For the second time, the size of the group of cotton plants was determined and the soil was wetted and the cotton plants grew in length for 5-7 days after the first control. Growing normal cotton, 7 days after the top of the top, 7-8 grams of metsylamine was moderately recharged. Dictamamine sprayed with a boom, to reduce the occurrence of axillary buds, plastic molding a good plant shape, improve yield has a good effect. Medical Equipment Disposal,Syringes Needles Sizes,Disposable Syringe,Insulin Syringe FOSHAN PHARMA CO., LTD. , https://www.foshanpharma.com