Grasp five key measures to improve greenhouse vegetable output in spring

In view of the weather conditions such as windy in spring and great temperature difference in the morning and evening, vegetable farmers should pay attention to the following key measures to manage greenhouse vegetables.

Greenhouse vegetables

1. Adjust the temperature scientifically. Give priority to reasonable temperature control. It is necessary to adjust the indoor temperature through reasonable ventilation. Before the outside temperature drops after 4: 5 p.m., cover the grass in time to ensure that the temperature in the shed is always within the range suitable for vegetable growth. When the temperature in the shed is not high at noon or when it is windy during the day, generally do not let out or let out less wind. When the lowest temperature at night can reach more than 15 ℃, the grass is no longer covered and can be ventilated day and night.

two。 Scientific watering. The temperature difference between morning and evening is large, and the ventilation in the greenhouse is small, so the management should pay special attention to the timing, time, frequency and mode of watering vegetables: (1) watering mode. For vegetables cultivated with plastic film mulching in the greenhouse, it is best to use dark irrigation or drip irrigation under plastic film. (2) watering time. Watering should be chosen as far as possible on a sunny morning. (3) watering water. The amount of water for vegetables depends on the weather, the growth of vegetables and soil moisture at that time. Generally speaking, after watering, the large enclosure should be closed, the indoor temperature should be increased, and after the ground temperature rises, the greenhouse should be opened in time for ventilation and moisture drainage, which is conducive to the robust growth of vegetables and inhibit the occurrence of diseases and insect pests.

3. Improve the lighting. One is to prolong the light time of vegetables as far as possible and increase the light intensity. Under the premise of ensuring the temperature in the greenhouse, the grass should be covered early and late every day as far as possible to prolong the light time of vegetables in the greenhouse; the second is to maintain a reasonable vegetable population structure.

4. Dressing up in time. While properly increasing the watering times and water quantity of vegetables, irrigate the vegetables with chemical fertilizer every 7 days or so. Topdressing should follow the principle of "a small amount for many times" and appropriately increase the application amount of phosphorus and potassium fertilizer in order to improve the quality and stress resistance of vegetables.

5. Pest control. With the increase of temperature, diseases and insect pests of greenhouse vegetables will also occur generally. The vegetable protection policy of "prevention first and comprehensive control" should be carried out for the prevention and control of various diseases and insect pests in vegetables. Attention should be paid to the selection of pesticides with high efficiency, low toxicity and low residue to control the occurrence and spread of vegetable diseases and insect pests.