营养液供液高度对水培生菜生长及矿质元素吸收的影响

在密闭植物工厂条件内，设置5种营养液高度（2、3、4、5、6cm）水培种植生菜，以探究霍格兰（Hoagland）配方营养液不同供液高度对生菜十种矿质元素（K、P、Ca、Mg、Na、Fe、Mn、Zn、Cu、S）吸收及积累的影响。结果表明：生菜地上部生物量以及光合色素含量均在4cm供液高度处理下最大，而地下部生物量以及根长均随着营养液供液高度的增加而升高；生菜地上部十种矿质元素的含量均在供液高度6cm处理下最大，而矿质元素在生菜中的单株累积量则表现为Fe、Mn元素在6cm供液高度下最大，Ca、Mg、Na、Zn、Cu、S元素在4cm供液高度下最大，K、P元素在5cm供液高度下最大。因此，实际生产中可以通过调节水培生菜营养液的供液高度，以达到提高生菜产量或生产功能性蔬菜的目的。

Effects of Nutrient Solution Levels on the Growth and Mineral Element Absorption of Hydroponics Lettuce

The effects of Hoagland nutrient solution with different liquid levels (2, 3, 4, 5, 6cm) on the content and accumulation of ten mineral elements (K, P, Ca, Mg, Na, Fe, Mn, Zn, Cu, S) in lettuce hydroponically cultured in a plant factory were investigated in the present study. The results indicated that the biomass and photosynthetic pigment contents in lettuce shoot were the highest under the 4cm treatment, while the root length and root biomass increased with the enhancement of nutrient solution height. The contents of all mineral elements in lettuce were the highest under the treatment of 6cm. The accumulation of Fe and Mn in lettuce reached the largest value under 6cm treatment, while the accumulation of Ca, Mg, Na, Zn, Cu and S were all the highest under 4cm treatment, and the largest accumulation of K and P were obtained with 5cm treatment. Different production purposes can be achieved by adjusting the liquid level of nutrient solution during the actual production.