A Dynamic Control of Concentration of Nutrient Solution for a Long-Term Forcing Culture of Tomatoes in a Closed Hydroponic System

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  • Ishihara Yoshiyuki
    Tochigi Prefectural Agricultural Experiment Station United Graduate School of Agricultural Sciences, Tokyo University of Agriculture and Technology
  • Hitomi Hideyasu
    Tochigi Prefectural Agricultural Experiment Station
  • Nakayama Chiharu
    Tochigi Prefectural Agricultural Experiment Station
  • Yamaki Yoshikazu
    Faculty of Agriculture, Utsunomiya University

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Other Title
  • 非循環式の閉鎖型養液栽培システムを用いたトマト促成長期栽培における培養液濃度管理法
  • ヒジュンカンシキ ノ ヘイサガタ ヨウエキ サイバイ システム オ モチイタ トマト ソクセイ チョウキ サイバイ ニ オケル バイヨウエキ ノウド カンリホウ

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Abstract

Control of the concentration of nutrient solution for a long-term forcing culture (LTFC) of tomatoes was studied in a non-circulating closed hydroponic system that was developed in order to decrease the load on the environment. An improved nutrient solution (NO3−N : NH4−N : P : K : Ca : Mg : S = 7.0 : 0.2 : 2.1 : 5.6 : 2.9 : 1.0 : 1.1 me · L−1) was applied in both LTFC and normal-term forcing culture (NTFC). Nutrient solution and nitrogen supplied in LTFC increased immediately after planting and reached a maximum in mid-October, then decreased until mid-December. Thereafter, the trends of nutrient solution and nitrogen supplied were similar in both LTFC and NTFC, i.e. nutrient solution and nitrogen supplied tended to increase until late March and early February, respectively. Concentration of solution within the substrate toward greater fluctuation in LTFC, but there was no ingredient that markedly exceeded the concentration of the nutrient solution applied. It was suggested that adequate levels of EC in the supplying nutrient solution would be 1.2 dS · m−1 from planting until early December, increased to 1.4 dS · m−1 then lowered in February to 1.0 dS · m−1.<br>

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