生菜对无机养分吸收特性的研究

A Study on the Absorption of Inorganic Nutrients by Lactuca sativa

在水培条件下，利用４种不同配方营养液（Ａ，Ｂ，Ｃ，Ｄ）对生菜吸收无机养分的特性进行了系统的研究．结果表明，生菜吸收氮、钾的能力比吸收磷、钙、镁的能力强，且不同营养液栽培的生菜，其吸收无机养分的能力亦不同，Ａ和Ｄ两个配方栽培的生菜吸收能力较强；在整个生长期中生菜吸收无机养分的能力呈下降趋势，但生长盛期略有上升，生菜对水分的吸收在生长初期、盛期、后期出现３个高峰．不同营养液处理的生菜。

This experiment,using different liquid formulas,studied the absorption of inorganic nutrient by Lactuca sativa under the condition of water cultivation. The result showed that the inorganic nutrient contents in Lactuca sativa differed with the change of nutrient liquid formulas. Among the formulas, Lactuca sativa absorbed more inorganic substance in A and D formula than in B and C formula. Also,it absorbed more N,K than P,Ca and Mg. Different formulas affected its ability of nutrient liquid absorption. In A and D formula,it absorbed more. During its growth period,its inorganic nutrient absorption ability tended to drop continuously,while it rose a little during its flourish growing period. The absorption of water reached three sumits in the initial,flourish and later growing period. The dry matter of unit weight consumed different quantities of water. When Lactuca sativa was treated with different nutrient liquids.