Management of Nitrogen Fertilizer to Reduce the Nitrate Concentration in Leaves and to Increase Yield in Chinese Chive Cultivation on Andosol

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  • Oshima Kazunori
    Tochigi Prefectural Agricultural College United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology
  • Mori Seiji
    Tochigi Prefectural Agricultural Experiment Station
  • Kodama Hiroe
    Tochigi Prefecture Shioya Minami-Nasu agricultural promotion office
  • Hirosawa Miyuki
    Tochigi Prefecture Haga agricultural promotion office
  • Oshima Masatoshi
    Tochigi Prefectural Agricultural Experiment Station
  • Motojima Toshiaki
    Tochigi Prefectural Agricultural College
  • Suzuki Satoshi
    National Federation of Agricultural Cooperatives, Tochigi Prefecture Headquarters
  • Ishihara Yoshiyuki
    Former Strawberry Research Institute, Tochigi Prefectural Agricultural Experiment Station
  • Kobayashi Yasuo
    Tochigi Prefecture Agricultural Environmental Guidance Center
  • Yamane Kenji
    School of Agriculture, Utsunomiya University United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology

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  • 黒ボク土のニラ栽培における低葉中硝酸イオン濃度および高収量のための窒素施肥管理
  • クロ ボクド ノ ニラ サイバイ ニ オケル テイヨウチュウ ショウサン イオン ノウド オヨビ コウシュウリョウ ノ タメ ノ チッソ セヒ カンリ

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Abstract

<p>Fertilization methods in which the nitrate concentration in leaves is low and yield is high in the cultivation of chinese chive in an andosol were investigated. The nitrate concentration in the leaves and nitrate nitrogen (N) content in the soil rose as the N content of the basal and additional chemical fertilizer increased A total of 600 kg・a–1 of compost with a comparatively high C/N ratio in which N was slowly mineralized, was applied, and the nitrate-N content in soil and nitrate concentration in leaves were low, and the yield was high. The nitrate-N content and available N in the soil before planting were analyzed, and the amount of N which was subtracted from the standard application amount (2 kg・a–1 N) was applied. Furthermore, controlled-release fertilizer was additionally applied, resulting in the nitrate concentration in leaves being relatively low and the yield being high. Based on these results, we propose a fertilizer application system using 600 kg・a–1 of compost, a reduced amount of N-based fertilizer, by analyzing the nitrate-N content and available N in the soil before planting, and the additional application of controlled-release fertilizer, as a new fertilizer management method for chinese chive in an andosol to reduce the nitrate concentration in leaves and increase the yield.</p>

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