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 caused by watering and fertilizing, such as water and fat roots or sudden watering of fried roots.
If it is because of the above reasons, the vegetable leaves turn yellow, how can we improve?
First increase the temperature. After watering, we must first raise the temperature of the ground. The temperature of the greenhouse can be increased by 2-3° C. than usual, and the temperature of the greenhouse can be maintained at 29-33° 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 low water temperature in winter, pouring large water can easily lead to rapid decline in low temperature, it is easy to cause capillary root injury, so pay attention to pouring small water. Watering time should be reasonable, can not be watered when the greenhouse temperature is high, generally choose 10 o'clock in the morning, the second day after watering properly increase the greenhouse temperature 2-3 °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.
Once again, increase rooting and rooting 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. The roots of peppers are difficult to regenerate and should be used with caution. 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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