Plowing in winter is not only an important measure to increase cotton production, but also an effective method to eliminate overwintering bollworms. According to research, cotton bollworms generally spend more than 2 to 6 centimeters from the ground (up to a depth of 9 centimeters) to pupate overwintering. Winter plowing has a variety of killing effects on bollworms: 1 destroys the diverticulum and changes the natural state of the carcass. Reduce the eclosion rate of late spring; 2 Turn some of the worms to the surface to make them dead, frozen or eaten by natural enemies; 3 Turn some worms into the deep layers of the soil so that they cannot be normally feathered and become suffocated. Reduce overwhelming insect sources. Its technical requirements are: 1. Winter ploughing time The sooner the winter ploughing time is, the sooner the better, generally after the harvest of the previous pod crops should be carried out, before the earth is frozen (the permafrost layer exceeds 5 cm) tilled, in order to prolong the weathering time and improve the pest control effect. And it is conducive to accepting more rain and snow. After the land is frozen and ploughed, not only the farming is difficult, but also the quality of the cultivated land is reduced, and the pest control effect is also poor. 2. The cultivator combines hoeing and plowing before winter plowing. After ploughing and then smashing and smashing, the water can be stored and the hoppers can be killed. According to surveys, the first winter plowing in cotton fields can kill 76% to 85.6% of cotton bollworm pupae. After plowing winter plowing, pupae are buried deep in the soil, which can reduce the survival rate by 86.4% to 92.5%; according to Shandong Academy of Agricultural Sciences Observed, after the winter ploughing followed by the depression, the spring water content of 5 cm soil layer was 16.4%, while only 8.2% was not. 3. Plowing depth Winter plowing, the plowing depth should be more than 10 cm; the deeper the winter plowing, the better the pest control effect. 4. Plough irrigation After winter tillage followed by winter irrigation or spring irrigation, not only can the soil be settled and weathered, but it can also increase the mortality rate of overwintering pupae. According to a study by the Chinese Academy of Agricultural Sciences, when the relative soil moisture content is 40%, the mortality rate of Helicoverpa armigera is 35.7% and the emergence rate of adult is 40%. When the soil moisture content is 70%, the mortality rate of Helicoverpa armigera is 46.7%. The eclosion rate was 33.3%; when the soil moisture content was saturated, the mortality rate of pupa was 100%. According to other data, winter plowing winter plowing plots have an overwintering mortality rate of around 80% for cotton bollworms, 60%~70% for overwintering mortality rates for plots with no tillage, and only 30% for non-irrigated plots. ~40%. In addition, due to the strong fly ability of adults of Helicoverpa armigera, winter plowing must be carried out in large areas in order to be effective; in addition to the reserved cotton prairie land, wheat fields are interplanted and orchard gaps are also required for winter plowing.
Botanical Extracts (Herb extracts) refers to the ingredients extracted or processed from plant (all or a portion of the plant) by suitable solvents or methods. They can be used in the pharmaceutical, food, health, beauty and other industries.
We source and supply these ingredients of plant (botanicals) primarily to specialty food and nutritional industries. We are steadfast and committed to our sales support, research and development of any botanical we supply. We have perpetual inventory and we choose to "optimize" formulations with our clients.
Plant Extracts,Botanical Extracts,Fruit Extracts,Natural Extracts SINOCHEM PHARMACEUTICAL CO., LTD , https://www.sinochemnutrition.com