Since May-June this year, the rainwater in the Yangtze River Basin has been continuous, and rain and rain are rare. In the case of high rainfall, those cotton fields that developed earlier and grew better, because of the peak of nutrient growth and the peak of fertilizer supply, most of the cotton fields have been growing wild, and there have been a lot of cotton seedlings with prolonged water growth. In order to rapidly transform the cotton seedlings and promote steady growth, it is necessary to distinguish the causes of water seedlings and take effective control measures.
The water is prosperous. It is mainly formed under the conditions of continuous rain. Insufficient sunshine during continuous rain, or when there is fine weather, high temperature and sufficient moisture accelerate the absorption of nutrients. The physiological activity of plants loses balance. Nitrogen is less carbon and promotes vegetative growth. The stems and leaves are luxuriant, but the surface layer has high water content. Affect the main roots to grow deeper and deeper. The main roots are shallow and the lateral roots are few. After the sunny days, the resilience is reduced. If the management fails to keep up, it can easily cause the consequences of “high, large, and empty†and it will encounter heavy rain and windy weather. It is easy to cause a large area of ​​cotton lodging, which brings more difficulty to management.
Control measures. One must catch the sunny cultivator. Through intensive tillage and loosening of soil tillage layer, suitable temperature, light, water, and gas conditions are created for the development of cotton plants, so that a large amount of soil water evaporates, and part of the root system is cut off, forcing the growth rate of stems and leaves to slow down. At the same time, it is necessary to timely clean up the “three ditch†in the cotton field, reduce the groundwater level, and induce the cotton roots to lay down, laying a good foundation for future growth and resisting the coming dry weather. For the madly long water seedlings in the cotton field, 15-20 cm deep trenches can be excavated between the rows to allow some exposed roots to be air-dried. After 2-3 days, the trenches can be filled with earth and can be combined with Shidangjiao.
The second is to protect the roots. For part of the cotton fields washed by heavy rain, this measure can improve soil structure. Prosperous water seedlings prone to premature aging, bad seedlings often decline first. Therefore, after the rain must be soil cultivating root mulching can improve the growth environment of cotton roots, enhance permeability, and promote new root groups is very effective. And can combine pruning, some cotton plants have emerged after the first fruit branch, you can remove the following leaf branches, reduce the consumption of nutrients, change the plant nutrient-distribution-oriented, so that nutrients concentrated transport to the fruit branches.
Third, we must add nutrition to prevent premature aging. Cotton seedlings grow mad and grow rapidly, and nutrient consumption is very high. Next, it is very easy to see “hungry seedlings†in fertilizer imbalances. This is easily overlooked by illusions, resulting in later defermentation. Therefore, after the weather is fine, 25-30 kg of compound fertilizer or 35-40 kg of compound fertilizer may be topped out per acre, and a combination of topdressing foliar fertilizer may be used, and 0.3% potassium dihydrogen phosphate may be sprayed after 4 PM. Apply 2-3 times to supplement phosphorus and potassium fertilizers. After 1-2 large peaches are finished, seize the opportunity to re-apply flower bell fertilizer.
Fourth, we must promptly chemical regulation and promote balanced growth. Prolonged sprouting of water, with 2 g of adipic acid or 8 ml of mestitin per mu, spraying with 40 kg of water, at intervals of about 10 days, and spraying once more. For the cotton fields that have been stable during the bud and early flowering stages, 1 g of Dinogestamine or 4 ml of Chuang Shuang is used per acre, and 40 kg of water is sprayed. Spraying should focus on the top of shoots and fruit shoot shoots, limiting its vertical and horizontal growth too quickly. We must pay attention to the operation method of “do not hit low (strain), fight fat (water) without thinning (three types of seedlings), and wet (rainy season and sufficient soil moisture) not to fight drought. Rational distribution in the cotton plant, to prevent the growth of water and prolonged vegetative growth and reproductive growth dislocation, loss of balance.
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