一、常见原因1.室温偏低或偏高。番茄花期对气温极为敏感,要求开花前5~7天和开花后2~3天白天气温控制在20~30℃,夜间为14~16℃。气温低于10℃就会严重落花、落果。若白天高于35℃,夜晚高于20℃,或白天高于40℃并持续4小时,特别是在开花前5~9天室温过高,也易造成落花。2.湿度过高。温室内空气相对湿度在85%~95%时,花粉粒吸水过 First, the common reasons 1. Room temperature is low or high. Tomato flower is extremely sensitive to temperature, requiring 5 to 7 days before flowering and 2 to 3 days after flowering daytime temperature control at 20 ~ 30 ℃, night at 14 ~ 16 ℃. Temperatures below 10 ℃ will severely flower, fruit drop. If the daytime is above 35 ℃, the night is higher than 20 ℃, or the daytime is higher than 40 ℃ for 4 hours, especially if the room temperature is too high for 5 ~ 9 days before flowering, it is also easy to cause flower falling. Humidity is too high Greenhouse air relative humidity of 85% to 95%, the pollen grains over water