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番茄性喜温暖,适于开花结实的夜间温度为15—20℃,日间温度为20—25℃。如果夜间温度低于13℃,常常引起落花而不能结实。因在低温下,花粉管的伸长生长、花粉的形成及发芽都受到妨碍。因此,在自然气候下,长江一带,要到5月上旬以后,最低温度回升到15℃以上时,才不落花,因而大大限制了番茄的生长季节及产量。自从发现植物生长调节剂可以防止番茄落花,形成无子果实以来,不论在露地生产及温室、大棚生产上都普遍应用,成为番茄早熟丰产不可缺少的一项措施。一、防止落花的生长调节剂的种类与浓度试验证明,能够防止番茄落花的生长调节剂很多。主要的有二、四滴(2,4—D即2,4—二氯苯氧乙
Tomatoes like warm, suitable for flowering strong night temperature 15-20 ℃, daytime temperature is 20-25 ℃. If the night temperature is below 13 ℃, often caused by falling flowers and can not be strong. Due to the elongation and growth of pollen tubes at low temperature, pollen formation and germination are hampered. Therefore, in the natural climate, the Yangtze River area, until the first half of May, when the minimum temperature rose to above 15 ℃, it will not flower, thus greatly limiting the tomato growing season and yield. Ever since it was discovered that plant growth regulators can prevent tomato from falling off and forming fruitless fruits, it has become an indispensable measure for early ripening of tomatoes, both in open field production and in greenhouses and greenhouses. First, to prevent falling flower growth regulator types and concentrations of test proved that tomato flower fall prevention and control of many growth regulators. The main two or four drops (2,4-D 2,4-dichlorophenoxyacetic acid