【目的】探讨黄河流域北部棉区应用缩节胺(1,1-dimethyl-piperidinium chloride,DPC)对棉花进行化学封顶的可行性。【方法】于2012—2014年在河北省河间市瀛州镇国欣科技园和北京市中国农业大学上庄实验站进行,共包括6个独立试验。供试棉花品种为国欣棉3号(GX3)、欣抗4号(XK4)、石抗126(S126)和欣试17(XS17)。DPC化学封顶技术分为单独应用常规DPC化控技术(简称DPC)、将常规DPC化控技术与增效型DPC(简称DPC+)相结合(简称DPC+DPC~+)两种方式,以在常规DPC化控基础上进行人工打顶(简称DPC+MT)为对照。【结果】2012和2013年花铃期(7—8月份)多雨,应用DPC化学封顶技术的棉株较高、新生果枝数较多,其中株高较DPC+MT增加10.6—12.3 cm,果枝数增加5.8—7.9台。2014年花铃期干旱少雨,DPC化学封顶的株高与DPC+MT相比无显著差异,新生果枝数不超过3台。DPC化学封顶对棉花产量的影响不显著,但可发现2012年DPC+DPC~+的产量表现出降低趋势,且上部果枝成铃少、新生果枝成铃多,群体熟期有推迟现象。2013和2014年DPC+DPC~+的产量和熟期则与对照相当或略有增减。DPC+的应用时间(7月中旬至7月底)和剂量(750—1 500 m L·hm~(-2))对棉花株型及产量的影响无显著差异,但应避免在结铃盛期(7月底)应用大剂量DPC+(1 500 m L·hm~(-2)),以防延长后期棉铃的成熟。与DPC+DPC~+相比,单独应用常规DPC化控技术进行化学封顶在多雨年份或高密度下对棉株的控长强度较弱,而且存在减产风险。【结论】应用DPC进行化学封顶在黄河流域北部棉区基本可行,实际应用时需要根据气象因子和种植密度决定单独应用常规DPC化控技术还是将常规DPC化控技术与增效型DPC的应用相结合。 【Objective】 The objective of this study was to investigate the feasibility of chemical capping of cotton with 1,1-dimethyl-piperidinium chloride (DPC) in the northern cotton area of ​​the Yellow River. 【Method】 In 2012-2014, Guoxin Technology Park, Yingzhou Town, Hejian City, Hebei Province and Shangzhuang Experimental Station, China Agricultural University, Beijing, were involved in 6 independent experiments. The cotton varieties tested were GX3, XK4, S126 and XS17. DPC chemical capping technology is divided into separate application of conventional DPC control technology (referred to as DPC), the conventional DPC control technology and efficiency DPC (DPC +) combined (referred to as DPC + DPC ~ +) in two ways to conventional DPC control based on artificial topping (referred to as DPC + MT) as a control. 【Result】 The results showed that in the flowering period (July-August) of 2012 and 2013, the cotton plants with DPC chemical capping technique had higher number of new branches and fruiting branches, and the plant height was increased by 10.6-12.3 cm compared with DPC + MT. Increase 5.8-7.9 units. In 2014, the flower-boll stage was arid and rainy. There was no significant difference in the height of DPC chemical capping between DPC + MT and newborn fruiting branch no more than 3. The effect of DPC chemical crown on cotton yield was insignificant. However, it was found that the yield of DPC + DPC + showed a decreasing trend in 2012, and the bolls of the upper fruiting branches were less, the bolls of new fruiting branches were more, and the population maturity was delayed. The yield and maturity of DPC + DPC ~ + in 2013 and 2014 increased or decreased as compared with the control. The application of DPC + (from mid July to the end of July) and the dose (750-1 500 m L · hm -2) had no significant effect on plant type and yield of cotton, but should be avoided during the boll stage ( At the end of July, high-dose DPC + (1 500 m L · hm -2) was applied to prevent prolonged boll maturation. Compared with DPC + DPC +, chemical dying using conventional DPC control technology alone had weaker controllability of cotton plants in rainy years or high-density, and there was a risk of yield reduction. 【Conclusion】 It is feasible to apply DPC for chemical capping in northern cotton area of ​​Yellow River. In practice, it is necessary to decide whether to use conventional DPC control technology alone or to apply conventional DPC control technology and synergistic DPC according to meteorological factors and planting density Combined.