叶用莴苣层架式栽培基质厚度的环境效应分析

以意大利生菜为试材，采用春、夏两季温室栽培，研究不同基质厚度（6、10、14 cm）对叶用莴苣根系环境、产量及品质的影响。结果表明：基质越厚，叶用莴苣根系温度和基质含水量变化幅度越小；10 cm 和14 cm 处理的叶面积、叶片数均优于6 cm 处理，单株鲜质量、干质量及可溶性蛋白、可溶性固形物、VC 含量亦均显著高于6 cm 处理，而硝酸盐含量显著低于6 cm 处理。综合考虑栽培架承重及成本投入，10 cm 厚度的育苗基质与羊粪（3 V∶2 V）复混基质适用于叶用莴苣层架式栽培。

Environmental Effect Analysis on Substrate Thickness in Layered Cultivation of Lettuce

Taking‘Yidalishengcai’as test material，adopting greenhouse cultivation in spring and summer 2 seasons，this paper studied the effects of different substrate thickness（6，10，14 cm）on root system environment，yield and quality of lettuce．The results showed that the thicker was the substrate，the less was the rangeability in temperature of lettuce root system and moisture content of substrate．The leaf area and leaf number treated with 10 cm and 14 cm thickness were superior than that treated by 6 cm thickness．And the single plant fresh weight，dry weight，soruble protein，soruble solid matter and VC content were all higher than that treated by 6 cm thickness．While，the nitrate content was remarkably lower than that treated by 6 cm thickness．Overall considering the cultivation frame load-bearing and cost input，10 cm thick seedling culture substrate mixed with sheep manure compound substrate（3 V∶2 V）was suitable to be used in lettuce layered cultivation．