1974、1975年,肯尼亚在不同的海拔高度,用100 ppm 赤霉酸对成龄的小粒种咖啡植株进行叶面喷射三次。1974年处理的植株,1975年的产量提高了12～26%。1975年处理的一些地区,1976年的产量提高了8～69%,但其他的地区却减产5～22%。咖啡豆的大小、外形和饮用质量并无影响。用25、50或100ppm 赤霉酸对果龄为4～10周的全株 1974, 1975, Kenya At different altitudes, mature small-grain coffee plants were sprayed three times with 100 ppm gibberellic acid. Plants treated in 1974 increased yields by 12-26% in 1975. In some areas processed in 1975, output increased by 8-69% in 1976, while production declined by 5-22% in other areas. The size, appearance and quality of the coffee beans have no effect. With 25, 50 or 100ppm gibberellic acid on the age of 4 to 10 weeks of the whole plant