• Journal of Bio-Environment Control
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• v.14 no.4
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• pp.263-268
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• 2005

The purpose of this experiment was to select proper nutrient solution for the water culture of young welsh onion (Allium fistulosum L.). Using two welsh onion varieties, 'Geumjanguedaepa' and 'Tokyokuro', which are good for water culture, four different nutrient solutions which were Chiba Agricultural Experiment Station solution for welsh onion, M's solution for leafy vegetables, Takekawa's solution far welsh onion, and Yamazaki's solution for welsh onion seedling were tested. Among the four nutrient solutions, increments of fresh weight and dry weight per block were the highest in Yamazaki's solution and, in the next, were placed by the order of M's solution, Chiba Agricultural Experiment Station solution and Takekawa's solution. Considering all the other results and fresh weight and dry weight increments, Yamazaki's solution for welsh onion seedling was selected as the best nutrient solution for water culture of young welsh onion.

• Journal of Bio-Environment Control
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• v.14 no.4
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• pp.269-274
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• 2005

The purpose of this experiment was to investigate optimal ionic concentration of nutrient solution for water culture of young welsh onion (Allium fistulosum). For the purpose of clarification of optimal nutrient concentration to maximize growth of young welsh onion, different nutrient concentrations of Yamazaki's solution for welsh onion seedling $(NO_3^--N\;9.0,\;NH_4^+-N\;3.0,\;PO_4^{3-}-P\;6.0,\;K^+7.0,\;Ca^{2+}\;2.0,\;Mg^{2+}\;2.0,\;and\;SO_4^{2-}-S\;4.4me{\cdot}L^{-1})$ which selected by prior experiment were treated as 0.6, 1.2, 1.8, and $2.4dS{\cdot}m^{-1}$. Increments of fresh weight, dry weight and top length were the highest in 1.2 and, in the next, were placed by the order of 1.8, 2.4, and $0.6dS{\cdot}m^{-1}$ The regression coefficients for the maximal growth of fresh weight of cv. 'Geurnjanguedaepa' and 'Tokyokuro' were $y=-42.091x^2+171.79x+11.047 (R^2=0.8946,\; R=0.9458^*)\;and\;y=-50.069x2+157.58x+15.414(R^2=0.9343,\;R=0.9692^{**})$, respectively, and optimal EC levels according to regression coefficients were 1.68 and $1.57dS{\cdot}m^{-1}$. As the conclusions, optimal nutrient levels far young welsh onion were $1.2dS{\cdot}m^{-1}$ EC in the early growth stage and $1.6\~l .7dS{\cdot}m^{-1}$ in the later growth stage.