[Objective]The preseut study was conducted to study the effects of different kinds and concentrations of plant growth retardants on hedge plants and their influence on ornamental quality, and to provide scientific basis for reasonable applieation of the plant growth retardants and reduction of conservation costs. [Method]The effects of foliar spray of paclobutrazol (PP333) (50,100,150,200,250,300 and 400 mg/kg) and chlorocholine chloride (CCC) ( 100,200,300,400,500,600 and 800 mg/kg) on Hibiscus rosa-sinensis L. and Carmona microphylla (Lam.) G. Don was investigated at seedling and fully developed stages. [Result]The growth retardant CCC and PP333 significantly inthibited the growth of Hibiscus rosa-sinensis L, especially at the concentration of 400-500 mg/kg CCC, without affecting the plant's uniformity and vitality.PP333 retarded the growth of Carmona microphylla, and the effects were found to be the best at the concentration of 400800 mg/kg PP333, without affecting the plant' s uniformity. The CCC was not found to be suitable for Carmona microphylla plants and showed the worst effects. [Conclusion]The results revealed that spraying CCC @ 400-500 mg/kg on Hibiscus rosa-sin crnsis L. at developed stage and PP333 on Carmona microphylla twice inhibited the hedge growth without affecting the plant' s general development and ornamental quality, and may reduce the fieqnent cutting operations and the maintenance cost.%[目的]研究不同种类、不同浓度的植物生长延缓剂对绿篱植物矮化效应和观赏质量的影响,为合理使用植物生长延缓剂、降低养护成本提供科学依据.[方法]以朱槿和福建茶为试验材料,喷施不同浓度的多效唑和矮壮素,比较不同种类、浓度植物生长延缓剂对两种绿篱植物的矮化效果和观赏质量的影响.[结果]喷施多效唑和矮壮素均能抑制朱槿的生长,其中成株期以矮壮素400～500mg/kg浓度的综合效果最好,处理后的朱槿植株整齐,生活力正常.喷施多效唑能抑制福建茶的生长,其中400～800 mg/kg浓度的综合效果最好,处理后福建茶植株整齐度良好;矮壮素对福建茶的矮化效果较差.[结论]生产上成株期朱槿两次喷施浓度为400～500mg/kg的矮壮素、福建茶两次喷施浓度为400～800 mg/kg的多效唑均能起到较好的抑制效果,可在保证观赏效果的基础上减少修剪次数,降低养护成本.
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