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Through the soil moisture monitoring monitor, the water demand of tomato growing period was monitored and analyzed. The result was a large period of time. The result was a large number of flowering results in this period, which is a period when water demand and fertilizer are needed. When the second panicle grows up to the size of the walnut (about 3 cm in diameter), the seedlings are finished and watering and topdressing are started to ensure the rapid expansion of the fruit. When the first fruit turns white from green, pour the second water and top-dress. Later, according to soil moisture and plant growth needs watering, generally every 6 to 7 days a water, and top dressing fertilizer. Each time a mu of 10 kg of urea or 15 kg of thiamine, or 15 kg of potassium sulfate, or 1000 kg of large manure, can be sprayed with 0.3% potassium dihydrogen phosphate or 2% of the grass ash solution. During this period, the temperature in daytime is about 25°C, nighttime is 15°C and 17°C, the relative soil temperature is 85-95, and the relative air humidity is 45-60%. Otherwise, high temperature and high humidity will reduce the pollen germination power, affect pollination insemination, and can easily cause flower drop and fruit drop. Therefore, while carrying out water and fertilizer management, ventilation should be strengthened to prevent excessive air humidity and high temperature hazards. When the minimum night temperature is not less than QC, ventilation can be provided overnight.
Soil moisture monitoring instrument has obvious monitoring effect on soil moisture in greenhouses, which can greatly increase the utilization rate of irrigation water. In addition, it should be noted that high temperatures in greenhouses and poor light conditions can easily cause tomatoes to grow long and affect tomatoes. quality. Therefore, the plant should be adjusted in time to control its excessive vegetative growth. The use of single stem pruning in the multi-cultivation of the small frame, leaving the three ear fruit topping (infinite), the big frame of a love autumn can be used to improve the double dry pruning, leaving 7--8 ear fruit topping. Generally, 4 fruits per panicle are removed, and the largest and smallest ones are removed. At the later stage, the yellow leaves and old leaves of the lower disease should be removed at any time in order to facilitate ventilation.
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