1, suitable temperature for vegetable growth generally needs 20-30 °C during the day, night temperature 10-20 °C, 5 °C below 40 °C growth inhibited, some crops have high temperature requirements, such as watermelon, melon, daytime required temperature 25- 30 °C. The growth stopped at 10°C and the freezing injury occurred at 5°C.
2. Specific methods for temperature regulation in the shed: 1 Multi-coverage cultivation techniques are usually used in winter production: covering the ground film on the ground; covering the shed film on the shed film, and then adding a layer of plastic film on the turf curtain. In case of strong cooling weather, temporary heating measures shall be taken: multiple coal cake stoves shall be set up in the shed for warming, and electric heating lines and diesel heaters may be used to warm the equipment. 2 The temperature in the summer shed is very high, and all the vents around the greenhouse must be opened. If the temperature is too high, the shade can be covered on the top of the greenhouse for cooling. In sunny days during the day, timely measure the temperature in the shed. Once the temperature rises above 30°C, immediately open the vents on both sides for ventilation and adjust the vents so as to stabilize the temperature in the shed at 25-30°C. 3 to take measures to increase light, increase light intensity, extend the light time: Select the high transmittance of the agricultural film, and frequently wipe the plastic film to ensure the clean surface of the agricultural film; cover the white film; the back wall hanging light curtain; timely pruning and picking leaves, Enhances the light transmission in the field.
Humidity control
1. Minimize the watering during the growth period, prevent the watering during the growth period from lowering the ground temperature, increase the air humidity, and if watering is required during the growth period, open the canal to fill the small water and avoid flooding.
2. Covering the drip-free membrane, irrigating the soil in the shed, using a plastic hose under the plastic film to spray irrigation, and drip irrigation facilities can be used if conditions permit.
3, try to use the size of row cultivation.
4, timely cultivating loose soil after watering.
5, under the premise of ensuring the appropriate temperature, timely ventilation, exhaust moisture; cold water season, should be selected in the sunny morning. Immediately after the watering, the enclosure was sealed and the temperature was increased. Wait until noon and afternoon to increase ventilation and remove moisture. Through the above measures, the air humidity in the shed can be greatly reduced.
Lighting control
1. When planting different types of vegetables in greenhouses, the principle of “lower height from north to south†should be followed, so that the plants can be staggered in height and order, and mutual obstruction can be minimized. Transplanting the same kind of vegetables, and strive for the same size of the seedlings, so that the plants grow neatly and reduce shading between the plants. At the same time, it is better to do planting in the north and south to make it as sunny as possible.
2, keep the film clean. Water droplets, dust, and other debris on the film will reduce the light transmittance by about 30%. After the new film is used for 2 days, 10 days and 15 days, the lighting in the shed will be reduced by 14%, 25%, and 28% in turn. Therefore, it is necessary to regularly clean, wash the dust, dirt and water droplets on the surface of the house, and keep the surface of the film clean to increase the transparency of the film. Snow should also be cleared of snow in a timely manner.
3, the use of non-drip films. The use of a drip-free membrane shed can increase the light intensity in the shed and increase the temperature of the shed.
4, reasonably uncover the straw curtain. Under the premise of doing a good job of insulation work, appropriate removal of the straw curtain used for heat preservation and delaying of the curtain curtain will be carried out. Generally, the curtain will be uncovered 0.5-1 hours after the sun comes out, and the curtain will be covered half an hour before the sun goes down. Especially in the rainy days when it rains, it is necessary to properly uncover the sun's scattered light.
5, set the light curtain. With a 2-meter-wide, 3 meter-long aluminized film reflector, hanging on the north side of the greenhouse to make it perpendicular to the ground, it can add 40% light to the ground, and the temperature of the shed can increase by 3-4°C. In addition, laying silver-gray film on the ground can also increase the light intensity between plants.
6, do a good job of plant finishing. Timely pruning, snoring, tying up vines, playing old leaves and other field management are conducive to ventilation in the shed.
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