ロックウール養液栽培における養分量管理の日施用法：高CO2濃度下におけるトマトの成育・収量および養分施用量

摘要: The efficacy of daily quantitative nutrient management (QNM) in tomato rockwool hydroponics under CO2-enriched conditions was tested. Three levels supply based on water uptake were compared with conventional electrical conductivity (EC)-based management. A newly developed automatic QNM system server and client controller prototypes used to control supply. Plants a greenhouse supplied 0.5 (S), 1.0 (M) or 1.5 (L) times the optimal amount nutrients for normal CO2 from October 2009 February 2010. EC-based produced highest cumulative total fruit yield during 16 weeks harvest followed by L, M S treatments, that order. There no significant difference marketable yields management, L but these three treatments significantly higher than treatment. Fruit dry matter content soluble solid almost same grown experiment S, 10, 24 42%, respectively, Nutrient use efficiency (NUE), defined as per unit used, all Thus, can reduce without lowering quality conditions. treatment provided balance between NUE. gave slightly lower NUE