Objective] To inhibit the vertical growth of Tifgreen 328, to reduce the frequency of lawn mowing, to lower the cost of lawn main-tenance, and to improve turf quality.[Method] Random block design was adopted.dwarfing agent PRIMO MAXX at different concentrations were designed.Its effects on the biological characteristics and physiological index of Tifgreen 328 were researched.[ Result] PRIMO MAXX at different concentrations significantly inhibited the plant height of Tifgreen 328, and shortened the length of leaf and node.PRIMO MAXX at proper concentration significant enhanced the green index, turfgrass coverage, tiller number, aboveground and underground biomass, and the resistance of turfgrass.However, PRIMO MAXX at high concentration influenced the quality of lawn.[ Conclusion ] Comprehensively, 0.10 mL/m2 PRIMO MAXX treatment shows the best effect, which has significant dwarfing effects on Tifgreen 328, and does not influence the quality of lawn.%[目的]抑制天堂草328垂直生长、减少草坪修剪频率、降低草坪养护费用以及提高草坪质量。[方法]采用随机区组试验设计，设置不同浓度的矮化剂浦绿处理，研究其对天堂草328生物学特性及生理指标的影响。[结果]不同浓度浦绿均可显著抑制天堂草328的株高并缩短其叶片及茎节长度，适宜浓度的浦绿不仅能显著提高其绿色指数、草坪盖度、分蘖数、地上与地下生物量，而且还能增强草坪草抗性，但高浓度浦绿则相反，会影响草坪质量。[结论]综合评价以0．10 mL／m2的浦绿处理效果最佳，其既可使天堂草328显著矮化，又不影响草坪质量。
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