应用植物生長刺激剂2,4-二氯苯酚代乙酸(簡称2,4-D)来防止番茄早春的落花,是本省及長江流域各省春番茄早熟丰产的重要措施之一。过去几年中,前浙江农学院(1954,1956)前华东农业科学研究所(1958年),及上海农业試驗站(1958年)等都有报告,証明2,4-D可以防止番茄在低溫以及高溫下的落花。目前应用的方法,是用2,4-D百万分之15-25的溶液,在开花的当天或开花的前一天浸花,卽把花瓣浸在溶液中。經过2,4-D处理以后,不但防止了落花,提早了采收期,而且增加了早期产量及总产量。但这一方法,在应用时,因技术不易掌握,时常发生药害,輕的引起部分新叶捲縮,植株矮小,生長 Application of 2,4-Dichlorophenylacetic acid (2,4-D), a plant growth stimulant, to prevent tomato from falling in early spring is one of the important measures for early and high-yielding spring tomato in the province and the Yangtze River Basin. Over the past few years, the former Zhejiang Agricultural College (1954, 1956) before the East China Institute of Agricultural Sciences (1958), and Shanghai Agricultural Experiment Station (1958) have reported that 2,4-D can prevent tomatoes at low temperature And falling flowers at high temperatures. Currently used method is to use 2,4-D 15-25 parts per million solution, on the day of flowering or bloom the day before flowering, 卽 petals immersed in the solution. After 2,4-D treatment, not only to prevent falling, early harvest period, but also an increase of early production and total output. However, this method, when applied, is not easy to grasp because of technology, and often occurs phytotoxicity, causing some light curling light, plant short, growth