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The growing technique for production of chemical-free vegetables and strengthening of food functionality by closed seedling production system

Research Project

Project/Area Number 17580022
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Horticulture/Landscape architecture
Research InstitutionChiba University

Principal Investigator

HOHJO Masaaki  Center for Environment, Health and Field Science, associate professor, 環境健康都市園芸フィールド科学教育研究センター, 助教授 (90110296)

Co-Investigator(Kenkyū-buntansha) TSUKSGODHI Satoru  Center for Environment, Health and Field Science, assistant professor, 環境健康都市園芸フィールド科学教育研究センター, 助手 (40270863)
Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2006: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2005: ¥2,800,000 (Direct Cost: ¥2,800,000)
Keywordsclosed seedling production system / chemical free / food functionality / soil less culture / germination of vegetable / NO3-N discharge / 無農薬葉菜栽培
Research Abstract

Contents of ascorbic acid were measured of Komatsuna and Spinach sawn on October and grown under soil and soil less culture. For soil culture, basal fertilizers were applied at three levels. For soil less culture, effects of organic compounds in nutrient solution were investigated. Plant heights and flesh weights 32 days after seeding of Komatsuna and Spinach tended to be inhibited as the amount of basal fertilizers increased. The effect of basal fertilizers was more apparent in the case of spinach, and its ascorbic acid contents tended to increase with higher amount of basal fertilizers. Although the contents of Ascorbic Acid of Komatsuna were higher than those of Spinach for all the levels of basal fertilizer applications, the relationship between the Ascorbic Acid contents and the amount of basal fertilizers was not clear. Compared to the conventional nutrient solution, nutrient solution with organic compounds inhibited the growth and accumulation of ascorbic acid of both crops. The … More effects of organic compounds were stronger in Komatsuna than those in Spinach. Crops to be grown, kinds of organic materials used and the composition of nutrient solution must be examined not in isolation but integrally.
Spinach and Komatsuna were cultivated without chemicals under soil less culture in a enhanced germination chamber and in a closed chamber for seedling production, which resulted in flesh weights of Spinach as high as 2 to 3 times, and those of Komatsuna as high as 1.5 to 2.5 times, compare with the conventional method. Suitable seeding density for rapid cultivation in a closed chamber was investigated. Plants seeded on the cell tray with 288 cells showed slight delays in growth compared with those with 144 cells. It is better to use the cell tray with 288 cells in view of its much less cultivation cost. The need for decreasing the nitrate contents of Spinach is very strong, because excess contents of nitrate in leaves is said to affect human health adversely. In this research, refraining to add nutrients to the nutrient solution a few days before harvesting decreases leaf nitrate content, though refraining too long days before harvesting decrease the growth rate. Less

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • Research Products

    (5 results)

All 2007 2005

All Journal Article (4 results) Book (1 results)

  • [Journal Article] ホウレンソウの養液土耕における日射比例型制御による 硝酸濃度低減化技術の開発2007

    • Author(s)
      篠原 温, 塚越 覚, 林 菜穂子, 丸尾 達, 北条 雅章
    • Journal Title

      園芸学研究 6・2

      Pages: 189-193

    • NAID

      110006249727

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] ホウレンソウの養液土耕における日射比例型制御による硝酸濃度低減化技術の実用化2007

    • Author(s)
      篠原 温, 塚越 覚, 林 菜穂子, 丸尾 達, 北条 雅章
    • Journal Title

      園芸学研究 6・2

      Pages: 195-199

    • NAID

      110006249728

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Development of the Fertigation Control Based on Cumulative Solar radiation for Decreasing the Nitrat Content in Spinach2007

    • Author(s)
      Y.Shinohara, S.Tsukagoshi, N.Hayashi, T.maruo, M.Hohjo
    • Journal Title

      Hort. Res. 6(2)

      Pages: 189-193

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Practical Use of the Fertigation Control Based on Cumulative Solar radiation for Decreasing the Nitrat Content in Spinach Grown in the Greenhouse2007

    • Author(s)
      Y.Shinohara, S.Tsukagoshi, N.Hayashi, T.maruo, M.Hohjo
    • Journal Title

      Hort. Res. 6(2)

      Pages: 195-199

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Book] 農耕と園芸 第60巻11号 苗テラスを利用したベビーリーフ栽培2005

    • Author(s)
      北条 雅章
    • Publisher
      誠文堂新光社
    • Related Report
      2005 Annual Research Report

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Published: 2005-04-01   Modified: 2016-04-21  

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