毛管給液を併用したトマトの閉鎖型養液栽培における培養液組成が培地内溶液濃度および収量に及ぼす影響(栽培管理・作型)  [in Japanese] Effect of Nutrient Composition Used in the Closed Hydroponics System with Capillary Uptake Method on Nutrient Element Concentrations in the Organic Substrates and Yield of Tomato(Crop Production & Cropping Type)  [in Japanese]

培養液の排出による環境への影響を抑制することを目的として開発した養液栽培用の改良処方培養液が,培地内溶液濃度,トマトの生育および収量に及ぼす影響を検討した.養液栽培装置は培地にスギ樹皮を用いた毛管給液併用の閉鎖型養液栽培システムとした.培養液は大塚A処方と,これよりK濃度を高め,Ca, MgおよびSO_4濃度を低めた改良処方とした.培地内溶液のEC, NO_3-N, Ca, MgおよびSO_4濃度は改良処方で低かった.収量は改良処方で多く,上段花房の茎径は太かった.本システムで改良処方を用いた場合,NO_3-Nを全く排出せずにトマト1株12果房から18.2t・10a^<-1>の収量が得られた.

A modified nutrient solution formula was evaluated for tomato production in a new closed hydroponics system aimed to reduce emission. The new system is a closed organic substrates (cryptomeria bark) culture using the capillary uptake method. The modified nutrient solution formula had a higher K level, lower Ca, Mg and SO_4 levels than the Ootsuka-A formula. EC, NO_3-N, Ca, Mg and SO_4 of the solution in the organic substrates were lower when the modified nutrient solution formula was applied. Using this newly developed system combined with the modified nutrient solution formula, the yield of 18.2t・10a^<-1> from twelve clusters per plant was obtained by tomatoes grown without emitting NO_3-N and exhaust solutions.