18 to 25 ° C is the most suitable temperature for tomato growth. If the normal temperature drops to only 13 ° C, the growth will be slow, but it will continue to grow, but below 13 ° C, the vegetative growth is very slow, and the overnutrition makes Flower buds are over-differentiated, causing abnormal fruit development and forming deformed fruit. If the temperature is above 13 ° C, but the water is too much, the stems and leaves are long, no flowering or less flowering. Therefore, try to keep the temperature within the appropriate temperature range while avoiding excessive moisture. At present, the wintering cultivation of tomatoes in greenhouses is in the flowering stage of the buds. According to the rainy and snowy weather, according to the growth and development of vegetables and fruits, strengthen the following production management technical measures: First, clear the ditch and clear the channel in time, eliminate the accumulated water in the field, make the ditch and the ditch communicate, and stop the rain to reduce the humidity in the field and promote The roots grow steadily. In particular, it is necessary to prevent rainwater from pouring into the greenhouse to cause waterlogging in the field. Second, do a good job in greenhouse temperature and humidity, lighting management. Pay attention to heat preservation and ventilation and dehumidification, timely ventilation and ventilation during the day, increase the light, keep warm at night, and conditionally spray hay ash and hay on the surface, and try to reduce the humidity in the shed. Increase the light of plant seedlings as much as possible. To use the high temperature at noon, see more light. Third, strengthen the management of fertilizer and water. Control the watering and nitrogen fertilizer application in the greenhouse to enhance plant resistance, prevent the growth of the disease and reduce the occurrence of diseases. After the weather turns fine, the plants can be properly topdressed by spraying, and 0.2% potassium dihydrogen phosphate, Ai Duo, etc. are applied to carry out the root dressing to promote the stable growth of the plants. Fourth, pay attention to the prevention and control of pests and diseases. During the rain and snow, try to reduce the spraying of pesticides, and use smoke agents to prevent and control the humidity in the shed. Grab the sunny day and remove the dead leaves and old leaves, and spray protective agents.
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