The temperature management should be sealed in the greenhouse within 5-7 days after the tomato is planted to promote the slow seedling. The temperature during the day is controlled at 25 ℃ ～ 28 ℃, if it exceeds 30 ℃, it must be ventilated and cooled; during the flowering and fruiting period, the temperature during the day is 20 ℃ ～ 30 ℃, and the temperature at night is not lower than 12 ℃; The night temperature is 12 ℃ ～ 17 ℃. In the case of continuous cloudy days, because the respiratory consumption is greater than photosynthesis, a large amount of harmful gases will accumulate in the greenhouse, so on continuous cloudy days for more than 3 days, the top wind should be released for 1 to 2 hours at noon, depending on the weather .
Humidity control generally maintains 80% to 90% of relative air humidity in the seedling stage, 60% to 70% in the early growth stage, and 50% to 60% in the fruiting stage. When the humidity is high, especially after watering, it should be vented and drained in time. Excessive humidity is one of the main reasons for the occurrence of tomato diseases. Therefore, it is recommended to adopt the integrated method of water and fertilizer under drip irrigation under the film, which can not only significantly reduce the humidity in the shed, but also reduce the fertilizer input and reduce the production cost.
For pruning and leaf picking, it is recommended to pick the heart when 4 to 5 ears are in time, and promote fruit expansion as early as possible. At the same time, it is necessary to timely remove the disease, old and dead leaves of the lower part of the plant to promote ventilation and reduce the occurrence of diseases.
To preserve flowers and fruits, it is recommended to use a tomato shaking pollinator to assist pollination when the spring stubble tomatoes bloom. Put the pollinator gently on the inflorescence handle and shake it for 0.5 seconds. The best time is from 9 am to 11 am. Pollinate at least 3 times a week. The use of shock pollinators can not only increase fruit setting rate, but also promote the formation of tomato seeds, significantly increase yield, and at the same time avoid the damage to tomato plants caused by spraying of Zuo Guo Ling and other agents, and reduce malformed fruit.
Water and fertilizer management Water and fertilizer management is generally carried out before the fruit is enlarged, and watering should be stopped 5 to 7 days before fruit harvest to prevent cracking.
Sunlight management Spring tomato after June, if the temperature is too high at noon time, it is necessary to use a shading net for proper shading to reduce the temperature in the shed. The shading time depends on the weather conditions, generally about 2 to 3 hours.
The prevention and control of diseases and insect pests should adhere to the principle of harmless prevention and control of "mainly agricultural prevention, physical prevention and biological prevention, and chemical prevention as the supplement". Pull out the seriously ill plants in time, remove the diseased leaves, and take them out of the shed to burn or bury them deeply. Reasonable intercropping, onion garlic should be selected for tomato companion cultivation can reduce the occurrence of soil and root diseases. At the same time, the yellow board can be hung to control aphids, the blue board to control thrips, and 60 mesh insect-proof nets can be covered in the greenhouse or greenhouse vents to prevent the entry of pests such as aphids, whiteflies, Bemisia tabaci, Liriomyza sativae, and cotton bollworm. If a disease occurs, it should be bred with high-efficiency, low-toxicity and short-lasting pesticides for prevention and control.
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