LED红蓝光光强模式对水培生菜生长与产量的影响

Effect of LED Red and Blue Light Intensity Mode on Growth and Yield of Hydroponic Lettuce

在环境可控的密闭植物工厂内,将定植后的生菜全生育期均分为3个生长阶段,分别用苗期、生长前期和生长后期表示,每段7 d,共计21 d,研究了苗期(S_(1))、生长前期(S_(2))和生长后期(S_(3))六种光强模式(T_(1):S_(1)-S_(2)-S_(3)为200-200-200μmol·m^(-2)·s^(-1),T_(2):S_(1)-S_(2)-S_(3)为100-100-400μmol·m^(-2)·s^(-1),T_(3):S_(1)-S_(2)-S_(3)为100-150-350μmol·m^(-2)·s^(-1),T4:S_(1)-S_(2)-S_(3)为100-200-300μmol·m^(-2)·s^(-1),T5:S_(1)-S_(2)-S_(3)为100-250-250μmol·m^(-2)·s^(-1),T6:S_(1)-S_(2)-S_(3)为100-300-200μmol·m^(-2)·s^(-1))对水培生菜生长和产量的影响。结果表明:对于水培生菜苗期阶段,200μmol·m^(-2)·s^(-1)光照强度处理下的生菜地上部鲜重、SPAD显著高于100μmol·m^(-2)·s^(-1)光照强度处理;生长前期阶段,T_(1)的地上部鲜重显著高于其他处理,达到最大值;生长后期阶段,T_(3)的地上部鲜重高于其他处理,达到最大值。总之,在相同DLI条件下,T_(3):100-150-350μmol·m^(-2)·s^(-1)能够明显提高生菜产量,LED红蓝光光强模式对水培生菜产量和生物量的提高有显著影响。

Six light intensity patterns(T_(1):S_(1)-S_(2)-S_(3):200-200-200μmol·m^(-2)·s^(-1),T_(2):S_(1)-S_(2)-S_(3):100-100-400μmol·m^(-2)·s^(-1),T_(3):S_(1)-S_(2)-S_(3):100-150-350μmol·m^(-2)·s^(-1),T4:S_(1)-S_(2)-S_(3):100-200-300μmol·m^(-2)·s^(-1),T5:S_(1)-S_(2)-S_(3):100-250-250μmol·m^(-2)·s^(-1),T6:S_(1)-S_(2)-S_(3):100-300-200μmol·m^(-2)·s^(-1))were studied in an enclosed environment-controllable plant factory.The growth and yield of lettuce in hydroponic culture were studied.The results showed that the light intensity of 200μmol·m^(-2)·s^(-1)was better than that of 100μmol·m^(-2)·s^(-1)at seedling stage,but the difference was not obvious;in the early growth stage,the aboveground fresh weight of T_(1)was significantly higher than that of other treatments,reaching the maximum;in the late growth stage,the aboveground fresh weight of T_(3)was higher than that of other treatments,reaching the maximum.In conclusion,under the same DLI conditions,T_(3):100-150-350μmol·m^(-2)·s^(-1)could significantly increase lettuce yield,and LED red and blue light intensity mode had significant effects on lettuce yield and biomass.