北関東の中山間地域の農用林における落葉および落葉堆肥生産と水田施用の有効性 Yields of fallen leaves and the compost from a farm forest and their efficacy for paddy rice cultivation in a hilly and lower mountainous area in northern Kanto

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著者

    • 乾 友恵 Inui Tomoe
    • 宇都宮大学農学部森林科学科 Department of Forest Science, Faculty of Agriculture, Utsunomiya University
    • 大澤 和敏 Osawa Kazutoshi
    • 宇都宮大学農学部農業環境工学科 Department of Environmental Engineering, Faculty of Agriculture, Utsunomiya University
    • 池田 純子 Ikeda Junko
    • 宇都宮大学農学部森林科学科 Department of Forest Science, Faculty of Agriculture, Utsunomiya University

抄録

北関東の中山間地域において,林地と農地の一体的利活用と有機物を用いた米生産に向けて,農用林から得られる落葉量,落葉堆肥の材料となる落葉量,そこから生産される堆肥量,水田投入量の測定を行い,水田1 haへの施用に必要な落葉および落葉堆肥を得ることができる農用林の林分面積を調べた。さらに,これらの有機物を用いて水稲栽培試験を行い,養分組成からみた水田施用の有効性を検討した。測定の結果,農用林から少なくとも5 Mg/haの落葉を確保できること,低温季からでは約9ヶ月で落葉487 kgから230 kgの落葉堆肥を生産できることがわかった。また,水田1 haへの施用に必要な落葉および落葉堆肥を確保することができる林分面積は1 ha程度であることがわかった。落葉および落葉堆肥の養分組成を調べた結果,肥効率を考慮した落葉および落葉堆肥の窒素量は,一般的な施肥基準量に達していなかった。しかし,落葉および落葉堆肥のリン酸とカリウムは,施肥基準量の10%以下であったため,リン酸やカリウムの過剰蓄積に対する低成分肥料として期待された。ただ,落葉および落葉堆肥を用いて栽培した2011年の米収量は,化成肥料を用いた慣行農法の8割程度と低くはないものの,無施肥区と比べると肥料効果は限定的であった。

In order to understand the past integrated use of farm forests and agricultural fields in a hilly and lower mountainous region in northern Kanto, as well as the production of rice using organic materials, we measured the mass of raw fallen leaves gathered from a farm forest, the mass of yielded compost made from fallen leaves, and the mass of raw fallen leaves and compost supplied to paddy rice fields. Based on our results, we estimated the area of farm forest required to foster a 1-ha paddy rice field. We also performed experimental cultivation to assess the efficacy of the fallen leaves and compost in terms of nutrient composition. We found that at least 5 Mg/ha of raw fallen leaves was obtained from the forest, and 1 ha of farm forest was necessary to cultivate a 1-ha paddy rice field using these organic materials. Analysis of nutrient composition indicated that the total amount of nitrogen in these organic materials did not meet the general recommended quantity. The quantities of phosphate and potassium in these organic materials were less than 10% of the general recommended level. However, these organic materials were expected to be effective fertilizers containing small amounts of phosphate and potassium for the soil in which excessive amounts of phosphate and potassium had accumulated. In 2011, the yield of cultivated rice using raw fallen leaves and compost was not so low, namely, 80% of that produced with conventional cultivation using chemical fertilizers, but was roughly equivalent to that produced with no fertilizer application, indicating the limited efficacy of these organic materials.

収録刊行物

各種コード

  • NII論文ID(NAID)
    110009804565
  • NII書誌ID(NCID)
    AN00124077
  • 本文言語コード
    JPN
  • 資料種別
    Journal Article
  • ISSN
    03888673
  • NDL 記事登録ID
    025280898
  • NDL 請求記号
    Z18-493
  • データ提供元
    NDL  NII-ELS  IR 
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