The yellow leaves of vegetables are yellow, except for the harm caused by drugs and the use of hormones. Most of them are caused by the lack of trace elements. The reason for the lack of nutrients is due to malabsorption of root injuries, especially when the temperature is low and adverse environmental conditions increase. The cause of root injury is not only related to cloudy days, but also related to unreasonable watering and fertilization. How to improve?
The first is to increase the temperature. After the watering, the temperature of the ground must be lifted first. The temperature of the greenhouse can be increased by 2°C-3°C than usual, and the temperature of the greenhouse can be maintained at 29°C-33°C during the day and 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, pay attention to the amount of water, time, and weather. In winter and early spring, the water temperature is low, and the pouring of large amounts of water easily leads to a rapid drop in the temperature of the ground, causing the capillary roots of the vegetables to be injured. Therefore, it is necessary to pour small water. Watering time should be reasonable, can not be watered when the greenhouse temperature is high, generally choose before 10 o'clock in the morning, the second day after watering appropriate increase in greenhouse temperature 2 °C -3 °C, in order to promote the temperature rise. In addition, it depends on the weather watering, do not try to water when cloudy, but also avoid cloudy days after watering.
Finally, it is to increase the rooting of fertilizers. Rooting and rooting fertilizers such as chitin and biological bacteria can not only promote the growth and development of roots, but also improve the soil structure, improve the root growth environment, and enhance root resistance. If the roots of pepper are difficult to regenerate, they should pay attention to the application. In the usual topdressing, the use 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.
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