Dealing with vegetable yellow leaves
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 when the temperature is low and adverse environmental conditions increase. 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 caused by the above reasons, the vegetable leaves turn yellow, how to improve it?
After raising the ground temperature, we must first raise the temperature of the ground. 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.
Watering attention, time and weather Due to the low water temperature in winter, pouring large water easily leads to a rapid drop in the temperature and it is easy to cause capillary roots to be injured, 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.
Increasing the rooting and rooting types of fertilizers such as chitin and biological bacteria, which can promote root growth and development, can also improve 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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