There are many rainy winter days in the north, which can easily cause yellowing of vegetable plants in the greenhouse, stagnation of growth, and severe death of plants, even if they can overwinter, there will be small plants, small leaves, short internodes, and flower topping. Leading to a severe reduction in production, this is the biggest threat to winter greenhouse vegetable production. Therefore, the management of greenhouse vegetables in low temperature and low light period should pay attention to the following five aspects:
1. Flush fertilizer in time, but not excessive. In low temperature period, the activity of the root system becomes worse, and the problem of root damage and yellow leaves caused by chemical fertilizer application is easy. At present, organic fertilizer or biological bacterial fertilizer should be used as the main fertilizer, but it should not be excessive, and the principle of "eat less and eat more" must be followed. Generally, 15-20 kg / mu of organic fertilizer or bio-fertilizer is applied at the top.
2. Foliar supplements should not be forgotten. In the low temperature period, the root activity is weak, and foliar fertilization is a good way to supplement plant nutrition and prevent deficiency. At present, the commonly used foliar fertilizers are full-nutritional types, such as the green fenwei series foliar fertilizer, fragrant foliar fertilizer, and multiple power. When plants are deficient, spray corresponding foliar fertilizer to relieve them.
3. Control water but not water shortage. Whenever the temperature drops, vegetable farmers are afraid to cause water sickness after watering or the humidity in the shed will increase greatly after watering. The vegetables in the fruiting period require more fertilizer and water. It is recommended that vegetable farmers should choose sunny weather and make up the water in time according to the soil conditions.
4. Spray plant growth regulators. Spraying with growth regulators such as brassinolide, love multi-harvest, and sclerostin, etc., can regulate the growth status of the crop and enhance the plant's resistance to disease and stress. Plants with weak growth can be sprayed with 1500 times solution of brassinolide or 6000 times more solution. Plants with strong growth can be sprayed with 750-1500 times of 25% booster.
5. Keep warm and ventilate. The outside temperature is low, and sometimes the lighting conditions are not good. In order to ensure the shed temperature, many vegetable farmers are not willing to ventilate. Near noon after the grass rafter was opened, in order to replenish carbon dioxide in the shed, promote the progress of photosynthesis, and discharge harmful gases accumulated in the shed, it was necessary to ventilate and ventilate on the premise of ensuring that the temperature was not lowered. The length of ventilation time can be determined by the temperature in the shed.
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