The yellow leaves of vegetables are yellow, except for the harm caused by pesticides and the use of hormones. Most of them are due to the lack of trace elements, and the lack of iron and zinc are the major factors for the deficiency of vegetables. The reason for the lack of nutrients is due to malabsorption of root injuries, especially in winter when the temperature is low and the number of adverse environments increases. The cause of root injury is not only caused by cloudy days, but also caused by watering and fertilizing, such as water and fat roots or watering deep-fried roots. If it is caused by the above reasons, the vegetable leaves turn yellow, how to improve it? First, raise the temperature of the ground and water it first. The temperature in the greenhouse can be increased by 2°C-3°C than usual, the temperature in the greenhouse can be maintained at 29°C-33°C during the day, and controlled at about 16°C at night. If the temperature is found to be lower than 13°C in the morning when the shed is pulled, measures such as thickening the straw curtain and covering the insulation and floating membrane shall be adopted. In addition, covering straw and rice bran in the operation line is also a good way to ensure constant ground temperature. Second, watering attention, time and weather due to the lower water temperature in winter, pouring large water easily lead to rapid decline in low temperature, it is easy to make capillary root injury, so pay attention to pouring water. Watering time should be reasonable, can not be watered when the greenhouse temperature is high, generally choose 10 o'clock in the morning before, the second day after watering appropriate increase in greenhouse temperature 2 °C -3 °C, in order to promote the temperature rise. It also depends on the weather watering. When it is cloudy, try not to water it. Before watering, watch the weather forecast and avoid the cloudy days after watering. Increasing the rooting and rooting types of fertilizers such as chitin and biological bacteria in rooting and rooting will not only promote the growth and development of the root system, but also improve the soil structure, improve the root growth environment, and enhance the stress resistance of the root system. The roots of peppers are difficult to regenerate and should be used with caution. In the usual topdressing application of bacteriostatic 968 per mu, 25 kg of Dayuan No.1 biological fertilizer or roots, etc., can significantly enhance the ability of vegetable roots to adapt and enhance their resistance to cold and disease. YT-HAT6018 YT-HAT6018 Shenzhen Sunshine Technology Co.,Ltd , https://www.yatwin.com