为明确棉花施N对DPC~+(1,1-二甲基哌啶鎓氯化物;1,1-Dimethyl-piperidinium chloride)化学封顶效应的影响,以新陆早53号为材料,于2013—2014年在新疆石河子地区进行田间试验。研究结果表明,施N量对棉花株高和果枝数影响不大,但显著影响棉花的产量。中N(300kg/hm2)处理子棉产量最高,较低N(150kg/hm~2)和高N(450kg/hm~2)分别增加23.5%和6.6%。棉花株高和果枝台数随DPC~+剂量的增加而下降,不同剂量DPC~+的株高较CK增加4.8~11.6cm,果枝数增加3.8~4.6台。中剂量(750mL/hm2)DPC~+处理的平均产量与CK基本持平,高剂量(1 050mL/hm~2)略有降低,低剂量(450mL/hm~2)的较CK降低6%~9%。中N中剂量DPC~+的产量是所有处理中(包括CK)最高的,主要原因在于干物质向经济器官的分配较多。低N和高N量下,分别以低剂量DPC~+和高剂量DPC~+的产量相对较高。施N量和DPC~+对棉花纤维品质无显著影响。棉花生产中需要根据N肥用量确定适宜的DPC~+剂量进行化学封顶。 In order to clarify the effect of N application on the chemical capping effect of DPC ~ + (1,1-dimethyl-piperidinium chloride) In 2014, a field experiment was conducted in Shihezi, Xinjiang. The results showed that N application rate had little effect on cotton plant height and fruit branch number but significantly affected the cotton yield. The highest yield of seed cotton with N (300 kg / hm2) treatment was 23.5% and 6.6% higher for low N (150 kg / hm2) and high N (450 kg / hm2), respectively. The number of plant height and fruiting branches of cotton decreased with the increase of DPC ~ + dosage. The plant height of DPC ~ + increased by 4.8 ~ 11.6cm and the number of fruiting branches increased by 3.8 ~ 4.6 units. The average yield of DPC + at medium dose (750mL / hm2) was basically the same as that of CK, but slightly decreased at high dose (1050mL / hm ~ 2) and 6% ~ 9 %. The yield of N medium dose DPC ~ + was the highest among all treatments (including CK), mainly due to the more dry matter distribution to economic organs. Under low N and high N levels, the yields of DPC ~ + and DPC ~ + were relatively high, respectively. N application rate and DPC ~ + had no significant effect on cotton fiber quality. Cotton production needs to be based on the amount of N fertilizer to determine the appropriate DPC ~ + dose for chemical capping.