塑料大棚中不同灌水量上限对生菜生长、品质及生理特性的影响

裴芸; 别之龙

塑料大棚中不同灌水量上限对生菜生长、品质及生理特性的影响

裴芸,
别之龙

Effects of different irrigation maxima on the growth, quality and physiological characteristics of lettuce in plastic greenhouse

摘要

摘要: 以两个散叶生菜品种(弘农和绿领)为材料，研究了塑料大棚栽培条件下不同土壤含水量(分别为田间持水量的60%～100%、60%～90%、60%～80%、60%～70%)处理对生菜生长、品质和生理特性的影响。收获期测定的结果表明，以田间持水量的90%作为灌水量上限条件下生菜地上部干鲜质量、叶面积、叶片数均最高，田间持水量80％为灌水上限条件下生菜地上部的生长优于田间持水量100％为灌水上限处理。随着灌水量上限的降低，生菜可溶性糖、可溶性蛋白含量逐渐升高，田间持水量80％和70％为灌水量上限处理下的维生素C含量显著高于其他两个灌水量上限处理。田间持水量70％的灌水量上限处理下生菜叶片中的MDA(丙二醛)、SOD(超氧化物岐化酶)、CAT(过氧化氢酶)和Pro(脯氨酸)含量最高，膜脂过氧化程度最重。本试验的结果表明，以田间持水量90％为灌水量上限处理下生菜的产量最高，综合不同灌水上限处理对产量和品质的影响，认为田间持水量80％的灌水量上限处理是最适合生菜生长的灌水处理。

Abstract: The effects of different field water capacities(60%～100%, 60%～90%, 60%～80%, 60%～70%) on the growth, quality and physiological characteristics of lettuce were investigated. The results showed that the greatest shoot fresh and dry weight, leaf area and leaf number were obtained by 90% irrigation maxima treatment, soluble sugar, soluble protein of lettuce gradually increased with the decrease of irrigation maxima, the vitamin C contents of lettuce under 80% and 70% irrigation maxima were significantly higher than those of other treatments. The highest contents of MDA, SOD, CAT and Pro were obtained by 70% irrigation maximum treatment. The highest yield was obtained by 90% irrigation maximum treatment, whereas the best irrigation maximum was 80% for the growth and quality of lettuce.

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