1960年,北京农业大学曾报道赤霉素对山楂具有保花保果作用。1973年,吉林省延吉市园艺场在试验中也得到了证实,并于1974年用于生产。1977年后,全国山楂生产科研协作组先后组织力量在吉林、山西、山东、河北等地进行了大规模试验,表明花期喷布50～ In 1960, Beijing Agricultural University reported that GA has protective effects on the fruits of hawthorn. In 1973, the horticultural field in Yanji, Jilin Province was also confirmed in the experiment and was used for production in 1974. After 1977, the Hawthorn Production and Research Collaborative Group in the country has organized large-scale experiments in Jilin, Shanxi, Shandong and Hebei provinces, demonstrating that the flowering period of 50 ~