‘九二○’是一种高效植物生长激素。山楂花期喷‘九二○’能防止落花落果,促进成熟,提高果实品质,增加产量。喀喇沁旗旺业甸镇三个村四户农民的山楂树喷施了‘九二○’后,在相同生长条件下,比不喷‘九二○’的有明显的增产效果,平均增产86％,其果子个数由118个/斤减少到63个/斤,酸度提高而且果子提前成熟5—7天。山楂喷施‘九二○’,应掌握如下技术。 1、要掌握好打药时间。山楂喷施‘九二○’要选在盛花期,即在绝大部分花蕾已经开放并进行 ’920’ is a highly efficient plant growth hormone. Spraying hawthorn flowering ’920’ to prevent falling flowers, promote maturity, improve fruit quality, increase production. Harqin flag Wangsan Meadow town three village four peasants hawthorn trees spraying ’920’, under the same growth conditions, than the non-spray ’920’ has obvious yield increase, the average yield 86%, the number of fruit reduced from 118 / kg to 63 / kg, acidity increased and the fruit matured in advance 5-7 days. Hawthorn spray ’nine two ○’, should have the following techniques. 1, to master the fight time. Hawthorn spray ’nine two ○’ to choose at full bloom, that is, in the vast majority of flower buds have been opened and carried out