“九二0”(赤霉素)是农业生产上常用的生长调节剂。实践证明,用“九二0”液涂抹西瓜瓜柄,个体重平均增加2～3成,含糖量提高30～40%。1.“九二0”溶液配制:先用白酒或酒精少许将“九二0”溶解,然后加水稀释至20～30ppm 的溶液备用。2.涂抹时间:西瓜雌花盛开时,涂抹第1次;西瓜长至核桃大小时,涂抹 “920” (gibberellin) is a commonly used growth regulator in agricultural production. Practice has proved that, with “nine two 0” liquid watermelon melon handle, the individual average increase of 2 to 3 percent, sugar content increased by 30 to 40%. 1. “nine two 0” solution preparation: first with a little liquor or alcohol to “nine two 0” dissolved, and then diluted with water to 20 ~ 30ppm solution for use. 2 smear time: watermelon female flowers in full bloom, the first application; watermelon grow walnut size, daub