Management Techniques of Low-temperature, Low-light Period Greenhouse Vegetables

Insulation not forget ventilation. Outside temperatures are low, and sometimes lighting conditions are not good. To ensure the greenhouse temperature, many vegetable farmers are not willing to ventilate. After the unfolding of the grass seedlings, it will be used to supplement the carbon dioxide inside the shed, promote the photosynthesis, discharge the harmful gases accumulated in the shed, and ensure ventilation and ventilation under the premise of ensuring no cooling. The length of ventilation time can be determined by the temperature conditions in the booth.

Control water but not water. Every time when the temperature is down, vegetable farmers are afraid that after watering, there is a phenomenon of rooting, or after the watering, the humidity in the shed increases. The vegetables in the result period have more demand for fertilizer and water. It is suggested that the vegetable farmer should select the fine weather according to the soil moisture content to make up for the vegetables to make up for the moisture, and choose the way of under-irrigation or pouring of small water under the membrane.

Timely fertilization, but not excessive. In the low temperature period, the activity of the root system deteriorates, and the problem of injuring the roots and yellow leaves is easily caused by chemical fertilizers. At present, fertilizer should be mainly organic fertilizer or biofertilizer. However, the amount of fertilizer should not be excessive. Follow the principle of “eat less food”. Usually topdressing organic fertilizer or biological fertilizer 15-20Kg/mu.

Leaf nutrition can not be forgotten. In the low temperature period, the activity of roots is weak, and foliar fertilization is a good way to supplement plant nutrition and prevent nutrient deficiency. At present, the commonly used foliar fertilizer is full-nutrition type, such as the Green Fenwei series foliar fertilizer, Fangrun foliar fertilizer, diversified force and so on. When the plant lacks the phenomenon, it can be sprayed with the corresponding foliar fertilizer to alleviate it.

Spray plant growth regulators. Spraying with growth regulators such as alizarin lactones, love, and booster can regulate the growth of crops and enhance their resistance to disease and stress. Weakly growing plants can be sprayed with 1,500 times more alizarin lactone or 6,000 times more love. Plants with prosperous growth can be sprayed with 5% to 1500-1500 times of 25% Met.

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