Temperature management The greenhouse should be sealed within 5 to 7 days after tomato planting to promote the slowing down of seedlings. The temperature during the day is controlled at 25℃～28℃, if it exceeds 30℃, ventilation and cooling is required; during the flowering and fruit setting period, the daytime temperature is 20℃～30℃, and the night temperature is not lower than 12℃; during the fruiting period, the daytime temperature is 22℃～30℃. , 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. Therefore, if the continuous cloudy days are more than 3 days, the wind should be put on for 1 to 2 hours at noon. The specific time depends on the weather conditions. .
Humidity control generally maintains the relative humidity of the air at 80%～90% in the slow seedling stage, 60%～70% in the early growth stage, and 50%～60% in the fruit stage. When the humidity is high, especially after watering, the air should be released in time to remove moisture. Excessive humidity is one of the main causes of tomato diseases. Therefore, it is recommended to adopt the integrated water and fertilizer method of drip irrigation under the film, which can reduce the humidity in the shed, and reduce the input of fertilizer and production. cost.
When pruning and picking leaves, it is recommended to pick the cores in time for 4 to 5 ears of fruits to promote fruit expansion early. At the same time, remove diseased, old, and dead leaves from the lower part of the plant in time to promote ventilation and reduce the occurrence of diseases.
It is recommended to use tomato oscillatory pollinators to assist in pollination when tomatoes bloom in spring. Place the pollinator gently on the inflorescence stalk, shake for 0.5 seconds, the best time is from 9 am to 11 am, and pollinate at least 3 times a week. The use of an oscillating pollinator can not only increase the fruit setting rate, but also promote the formation of tomato seeds, which will increase the yield. At the same time, it can also avoid the damage to the tomato plants caused by spraying zaguoling and other agents, and reduce the deformed fruit.
Water and fertilizer management Water and fertilizer management is generally carried out before the fruit expands, and watering should be stopped 5-7 days before the fruit is harvested to prevent fruit cracking.
Light management After June, if the temperature of spring tomatoes is too high at noon, use shading nets to reduce the temperature in the shed. The shading time depends on the weather, generally about 2 to 3 hours.
The prevention and control of plant diseases and insect pests should adhere to the principle of harmless prevention and control of "agricultural control, physical control and biological control as the mainstay, and chemical control as the supplement". Pull out the seriously diseased plants in time, remove the diseased leaves, and take them out of the shed to burn them or bury them deeply. Reasonable intercropping, onions and garlic should be selected for tomato-associated cultivation, which can reduce the occurrence of soil and root diseases. At the same time, you can hang yellow boards to control aphids, hang blue boards to control thrips, and cover 60-mesh nets in the vents of greenhouses or greenhouses to prevent aphids, whitefly, whitefly, Bemisia tabaci, Liriomyza, cotton bollworm and other pests from entering. If the disease occurs, it is necessary to select high-efficiency, low-toxicity and short-lived agents for prevention and control.
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