水耕蔬菜礦物質含量的探討

Studies on the Mineral Contents of Hydroponic Vegetables

曾政鴻(Jeng-Horng Tsen) ； 金安兒(V. An-Erl King)

《農林學報》 50卷1期 (2001/03) Pp. 49-59

https://doi.org/10.30089/JAF.200103.0005

摘要

水耕蔬菜(hydroponic vegetables)為臺灣近年來新興的種植作物，有關其栽培條件對於其本身營養成份變化量的影響仍有待探討。本研究即在探討不同營養液礦物質濃度對所得蔬菜礦物質含量的影響，並分析市販水耕與土植蔬菜二者間礦物質含量的差異。本研究蒐集市販水耕與土植空心菜，並模擬皺葉白菜之水耕栽培，測定所得蔬菜樣品中之礦物質含量。針對市售水耕與土植空心菜樣品，以及水耕模擬栽培之皺葉白菜樣品，利用原子吸收光譜儀測定其K、Mg、Ca、Fe、Cu、Mn、Zn、Mo等礦物質的含量。對於水耕模擬栽培試驗中之培養液，在栽培期中定期追蹤其中上述礦物質濃度及pH的變化。結果發現，蔬菜中礦物質含量的多寡與其培養液礦物質濃度大小並無明顯相關；但是培養液礦物質濃度高低對其生長的茂盛與否卻有影響。在市售樣品的比較方面，兩者蔬菜之個別元素組成多寡雖互有差異，但整體而言其礦物質含量亦差別不大。

關鍵字

水耕 ； 蔬菜 ； 礦物質

並列摘要

Nutrient solution composition exerts significant effects on the nutrient contents of hydroponic vegetables. In this study, mineral contents of market-sold hydroponic and soil-cultured water convolvulus samples were analyzed, and hydroponic culture experiment of curled Pak-Choi was conducted and cultured samples were collected for mineral contents analysis. Atomic absorption spectrophotometry was applied to measure the contents of minerals, i.e. K, Mg, Ca, Fe, Cu, Mn, Zn, Mo of market-sold hydroponic and soil-cultured water convolvulus samples as well as hydroponic curled Pak-Choi. The variations of mineral concentrations and pH of the culture solutions used in the hydroponic experiments were tracked periodically. Results showed that there was no relationship existed between nutrient solution concentrations and vegetable mineral contents. However, the nutrient supply affected the growth of vegetables. Both market-sold samples had no remarkable difference in mineral compositions and contents.

並列關鍵字

hydroponics ； vegetable ； minerals