蔬菜無土栽培之研究（二）培養液配方對莧菜生長之影響

Studies on Vegetables in Soilless Culture (2) the Effect of Nutrient Solution Formulas on Grawth of Edible Amaranth

以10公分高淺塑膠密為容器，用砂及砂與至石依1:1混合為栽培介質，選取適於砂耕栽培蔬菜配方九種來栽培莧菜，結果以Arnon與Hoagland二氏之配方對莧菜生長、產量、品質最好，與其他配方相較，差巽均屬顯著；Shive與Robbins二配方，生長、產量最差，其他六種配方介在中間。夏天生長的莧菜，K、N濃度在200p.p.m.以上，產量才會高。Shive與Robbins之二配方K（59、90p.p.m），N（56、146p.p.m）濃度過低，致產量最小。最理想的化學藥品組成分為：KNO3 0.01M；Ca（NO3）2 0.003M；MgSO4 0.002M與NH4H2PO4 0.002M。

Sand and the mixture of sand and N. G vermiculite (1:1) Wale used as the rooting media when 10cm depth shallow plastic basket was used as a container. Nine nutrient solutions were formulated by the Arnon and Hoagland (1940), Hoagland and Snyder (1933). Hewitt's Loaf Ashton solution (1966), Shive and Rivvuas (Ⅰ and, Ⅱ, 1912) Robbins (1946), and Bentley's Glenhazel formulas (summer, greens and spinach, 1959). As regards growth and yield of edible amaranth (Amarantthus mangostanus L.) grown in summer season, the Arnon and Hoaglond (1940) solution showed highly significant superiority and the lowest yield was produced by Shive and Robbins (New Jersy) solutions. High yields were associated with high N and K level (200 ppm), the relatively low yield from the N. J. solutions were due to the low K (59.90 ppm) and N (56.146 ppm) level; the best chemical compositions in this study is: KNO3, 0.01M; Ca (NO3)2, 0.003M; MgSO4, 0.002M and NH4H2PO4, 0.002M.