土壌の違いによる農産物の抗酸化力の比較 : 有用微生物群(EM)活用との差異に着目して(第2報) Comparison of anti-oxidation effect of agricultural products based on differences in the soil : Focusing on differences with Effective Microorganism (EM) technology [The second report]

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「目 的」 生産方法の違いが、農産物の持つ抗酸化力にどのような影響を及ぼすのか、特に土壌養分の質の違いに着目し実験を行った。「方 法」 慣行農法と有用微生物群(EM)を活用した有機農法で別々に育てられた、自家採種の自然種の野菜(ダイコン)の抗酸化力・糖度・電気伝導度・可給態窒素を圃場にて栽培測定した。測定機器はウイスマー社フリーラジカル評価システムF.R.E.E(Free Radical Elective Evaluator)、アタゴ社製Brix糖度計およびHORIBA社製コンパクト電気伝導率計B-173を使用し、測定を実施した。統計処理は、Studentのt検定を行った。「結 果」 ダイコンにおける抗酸化力の平均値は、EM農法が493.05μmol /mlに対して慣行農法は440.44μmol /ml、一方糖度の平均値はEM農法が7.5Brix%に対して慣行農法は7.1Brix%であった。抗酸化力(0.01<p<0.05)、糖度(p<0.01)共にEM農法のほうが慣行農法に比較して高い抗酸化力を示した。一方、野菜から体に入り、有害とされる硝酸態窒素は慣行農法が高かった。また養分(肥料)は慣行農法の方が一気に土中に放出されるが、有機農法の方は微生物が養分を抱え込みながら徐々に土中放出することが示された。「考察・結論」 有用微生物群を活用したEM農法の方が、慣行農法に比べて抗酸化力・糖度の高い農産物を栽培できることが示唆された。EM農法で育てられた抗酸化力の高い食材を摂取していくことは、活性酸素の影響を防ぎ、ヒトの健康維持に有用であると考えられる。さらに有用微生物群は土中で養分を作物に供給する調整能力があることが伺われた。Purpose: This study was conducted to examine how different farming methods can influence the levels of anti-oxidation and sugar contents in vegetables, specifically focusing on differences in the nutritional content of soil.Methods: Seeds of Daikon (White Radish, Raphanus sativus var. longipinnatus) were prepared. They were organically harvested and self-seeded. The seeds were separately grown in different plots with two different farming methods: Organic and Conventional. The organic farming method used in this research specifically refers to that using EM (Effective Microorganism) technology (EM organic farming hereafter). Daikon were grown in the different plots, and their changes were measured in the anti-oxidization, sugar content, electrical conductivity, and available nitrogen. A device called FREE, Free Radical Elective Evaluator, manufactured by Wismerll Co. Ltd., was used. B-173 Electric Conductivity Meter, manufactured by Horiba Ltd., and Brix Meter by Atago Co. Ltd. were also available for measuring the soil and vegetable contents. Student's t-test was used to assess significance.Results: Average levels of anti-oxidation in Daikon were 493.05 μmol/mL with the EM organic farming, and 440.44 μmol/mL with the conventional farming. Regarding the Brix average, EM organic farming yielded a 7.5 brix%, and that for conventional farming was 7.1 brix%. EM organic farming led to higher levels of anti-oxidation and sugar contents than conventional farming (p<0.05). It was also noted that the nutritional contents were spread uniformly in the conventional soil and vegetables; on the other hand, in the organic soil, they were absorbed by microorganisms and gradually accumulated in the vegetables. Discussion and Conclusion: In this study, compared to conventional farming, EM organic farming produced vegetables containing higher levels of anti-oxidation and sugar contents. The daily intake of organically grown produce using EM technology may be beneficial for human health due to its higher content of anti-oxidants. Effective microorganisms in the soil also have the ability to optimally adjust the nutritional content of produce.

収録刊行物

  • 九州看護福祉大学紀要

    九州看護福祉大学紀要 15(1), 13-18, 2015-03

    九州看護福祉大学

各種コード

  • NII論文ID(NAID)
    110009889138
  • NII書誌ID(NCID)
    AA11320982
  • 本文言語コード
    JPN
  • 資料種別
    Departmental Bulletin Paper
  • 雑誌種別
    大学紀要
  • ISSN
    13447505
  • NDL 記事登録ID
    026255636
  • NDL 請求記号
    Z74-B507
  • データ提供元
    NDL  NII-ELS  IR 
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