为探讨夜间补充光照对大棚火龙果冬季植株促花的效应，以2年生‘短芯’红肉(心)火龙果植株为试材，每天夜间补光6 h，以不补光为对照，观测火龙果枝条抽蕾状况。结果显示，在平均光强500 lx、每天补充光照6 h、连续补光45 d条件下，第一批次植株抽生花蕾率达83.3%，老枝(枝龄≥12个月)抽生花蕾率为15.2%，青枝(枝龄＜12个月)抽生花蕾率为28.0%，抽生花蕾枝条占植株总枝条数的21.4%；枝条花蕾数占枝条上芽点数的比率，老枝为2.7%、青枝为2.9%。而对照植株没有抽生花蕾，抽蕾率为0。表明夜间补充光照可有效地促进大棚火龙果冬季植株抽花。

Effect of supplemental lighting on promoting flower of pitaya in greenhouse in winter was carried out. Results showed that the flower bud rate of pitaya reached upto 83.3% in the first batches at the conditions of average light intensity 500 lx, 6 h each day for lasting 45 d, the average flower bud rate of old branches(branch age was equal or greater than twelve months) was 15.2%, the average flower bud rate of young branches (branch age was less than twelve months) was 28.0%, the flower bud branches occupied 21.4% of all branches. The percentage of bud points which flowered on old branches was 2.7 percent, while that on young branches was 2.9%. However, there was not flower bud on those plants without supplemental lighting. The results indicated that supplemental lighting could effectively promote flower buds of pitaya in greenhouse in winter.