Cotton in the rainy season

Entering the rainy season is the most vigorous period for the growth and development of cotton plants, and it is also a crucial period for determining cotton yield and quality. However, during this period of time, large changes in climate and frequent occurrence of disasters, such as droughts, hailstorms and hailstorms, often caused damage to cotton production. Production practice proves that to achieve high quality and high yield of cotton, it is the key to enter the rainy season to strengthen management. Its management measures are:

Control fertilizer. In the rainy season, cotton has both long foliage and increased buds, and the demand for fertilizer and water reaches a peak. Fertilizer should be topdressed in a timely manner to guard against premature aging. However, due to the relative abundance of rainwater in the rainy season, it is extremely beneficial to the exertion of various fertilizer effects, resulting in a long and mad growth of cotton plants. Therefore, while topdressing, it should also be done: 1. The cotton field with sufficient base fertilizer and large amount of fertilizer should be given less or no application, and pay attention to clearing the ditch and draining to prevent waterlogging. 2. For cotton plant growth retardation, red stem to the top, the small yellow color of the cotton field should be applied early and increase the amount of fertilizer, such as urea can be about 8 kg per mu. In addition, if a continuous drought occurs and the soil moisture content is less than 60% of the field water capacity, it should be replenished from time to time.

Properly controlled. After entering the rainy season, the cotton plants are prone to madness, which causes the rapture of the buds. In time, the growth of the cotton plants can be stabilized by the use of dildoamine or auxin, which can improve the plant type and increase the number of buds. The method is: during the early flowering period of cotton in the early rainy season, use 6-8 milliliters of assisting factor or 1.5-2 grams of salicylamine per mu, spray 30-40 kg of water to the whole field. Into the middle of the rainy season, about the end of July to early August, can be used about 3 grams of dilute amine powder, spray 40-50 kg of water.

Prune topping. Due to the accelerated growth of cotton plants in the rainy season, their axillary buds are also prone to occur. Therefore, it is necessary to manually wipe out the rain stop gap. When the cotton plant grows to a predetermined plant height, it is necessary to break down and suppress the apical dominance, reduce unnecessary consumption of nutrient on the upper non-effective branch, promote boll development, etc., and it should be applied at the right time (approximately mid-to-late July).

Scientific pest control. The occurrence of various pests and diseases has a significant relationship with the rainfall conditions in the rainy season. If the drought is not conducive to the hatching of H. armigera eggs and larval development, but a large amount of rain and precipitation will hinder the hatching of eggs, especially the heavy rain has a strong flushing effect on the eggs and newly hatched larvae. If the rainfall in the rainy season is small and even, it will help the outbreak of the bollworm. However, if there is little precipitation during the rainy season and the drought is severe, then it is beneficial to the propagation of red spiders. On the contrary, if there is continuous rain during the rainy season, the cotton plant is very prosperous, the madness grows seriously, and the field is poorly drained. The cotton plants are susceptible to withering and verticillium wilt, and at the same time triggering the emergence of the rot disease. Therefore, the prevention and control of cotton pests and diseases should be combined with the weather conditions in the rainy season, reasonable selection of pesticides, scientific control, can only do more with less.

Suitable for natural disasters. The entry into the rainy season is an easy-to-produce period such as drought, waterlogging, hailstorm, and high winds. On the basis of strengthening defense, we must also respond to irresistible disasters and take measures to save them so as to reduce the damage. For example, the cotton fields damaged by hail shall be timely filled with fertilizer and promote recovery as soon as possible; followed by timely pruning, chemical control, and prevention of pests and diseases. For the cotton affected by the disaster, one is to clean up and clear the drainage system as soon as possible, and remove the accumulated water; followed by cultivating the loose soil, increase fertilization materials, prevent defermentation and drought.