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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  • Aizawa Mineaki
    Department of Forest Science, Faculty of Agriculture, Utsunomiya University
  • Inui Tomoe
    Department of Forest Science, Faculty of Agriculture, Utsunomiya University
  • Hirai Hideaki
    Department of Agrobiology and Bioresources, Faculty of Agriculture, Utsunomiya University
  • Osawa Kazutoshi
    Department of Environmental Engineering, Faculty of Agriculture, Utsunomiya University
  • Ikeda Junko
    Department of Forest Science, Faculty of Agriculture, Utsunomiya University
  • Ohkubo Tatsuhiro
    Department of Forest Science, Faculty of Agriculture, Utsunomiya University

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Other Title
  • 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
  • キタカントウ ノ ナカヤマ カン チイキ ノ ノウヨウリン ニ オケル オチバ オヨビ オチバ タイヒ セイサン ト スイデンシヨウ ノ ユウコウセイ

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Abstract

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.

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