植物生长调节剂对空心菜产量、品质及养分吸收的影响

为探明喷施植物生长调节剂(Plant Growth Regulator, PGR)对蔬菜作物减肥增效的作用，通过田间试验，减少常规施肥50%时，研究5种组合的PGR(PGR1~5)对空心菜产量、品质和养分利用的影响。结果表明，与仅施50%常规施肥处理相比，喷施PGR1、PGR2、PGR3显著提高空心菜产量，分别增加11.3%、12.9%和15.7% (P<0.05)，使之与常规施肥处理的产量相当。与常规施肥和50%常规施肥处理相比，喷施PGR1~5均显著降低空心菜硝酸盐含量，降幅分别为58.2%~64.4%和30.9%~58.2% (P<0.05)。喷施PGR1处理显著提高空心菜氮含量，N的吸收利用率高达58.6%，与常规施肥和50%常规施肥处理的N吸收利用率相比增幅在50%左右。因此，喷施PGR可提高空心菜品质和对N的吸收利用，达到“减施不减产”的目的，尤以PGR1的综合作用效果显著。

Effects of Plant Growth Regulators on Yield, Quality and Nutrients Absorption Efficiency in Water Spinach

To explore the effect of plant growth regulator on decreasing fertilizer rates and improve nutrient utilization for vegetable crop,a field experiment was carried out to study the response of 5 combinations of PGRs on yield,quality,and nutrient utilization of water spinach with 50% conventional fertilization （CF）.The results showed that foliar spray PGRs 1-3 significantly increased the aboveground yield by 11.3%,12.9% and 15.7%,compared with 50% CF alone respectively,which were comparable to those obtained with CF.NO 3 content of PGRs-treated water spinach （PGR1-5） was very significantly decreased by 58.2%-64.4% and 30.9%-58.2% compared with CF and 50% CF,respectively.Moreover,foliar spray PGR1 significantly enhanced N absorption,and utilization efficiency of N was up to 58.6%.The improvement were over 50% compared with CF and 50% CF.Therefore,foliar spray of PGRs could improve quality and nitrogen utilization in water spinach reduce fertilizer rate without damaging the yield,especially the combination of PGR1.