報告書番号

V11056

タイトル（和文）

石炭灰中の微量元素が作物の生育に及ぼす影響

タイトル（英文）

Influence of Trace Elements in Coal Fly Ash on Crop Growth

概要 （図表や脚注は「報告書全文」に掲載しております）

フライアッシュ(FA)から溶出し作物に吸収される可能性のある必須微量元素を明らかにするため、FAを珪砂に添加しコマツナとハツカダイコンを栽培した。さらに、アブラナ科作物（コマツナ、ハツカダイコン、ハクサイ、キャベツ）、マメ科作物（エンドウ）の生育と微量元素との関係から適切なFA施用量を推定した。その結果、コマツナ、ハツカダイコンの植物体中のBとMoの濃度が高くなり、これらが吸収されたと判断された。そのBを添加した水耕栽培において、アブラナ科作物は生育が促進されたが、エンドウでは生育が阻害された。一方、Mo添加ではいずれの作物も生育に違いはなく、Bが主に生育に作用すると考えられた。これにより、微量元素の肥効に関するFAの効果は、珪砂を用いた試験システムと水耕栽培を組み合わせた試験法を用いることで、作物生育との関係を定量的に評価できると考えられた。これに基づいて、本試験で使用したインドネシア炭実機灰のB過剰症状を発生させない許容施用量を推定すると、アブラナ科作物で2~5%w/w、マメ科作物で0.25～0.5%w/wであると考えられた。

概要 （英文）

It is important to present the main effect of coal fly ash (CFA) to use CFA as a soil amendment on farmland. Thereby, the effects of CFA application to crop growth were investigated for specifying the trace elements absorbed by crop. Additionally, the rate of CFA application was determined based on the relation between the trace elements and crop growth. Japanese mustard spinach and red radish were grown in the silica sand media applying CFA. As a result, the both crop growth was increased maximally by 100g CFA (2% v/v) application. Uptake of boron and molybdenum was increased by increasing CFA application rate. Otherwise, Brassicaceae crops such as spinach and red radish, cabbage, Chinese cabbage and leguminous crop such as Peas were grown in the hydroponics for examining the effects of boron or molybdenum added to nutrient solution. The boron application was increased the growth of Brassicaceae crops. Otherwise, the growth of leguminous crop was markedly decreased by the boron application. The growth of all crops was no influenced by the molybdenum application. then it was suggested that the effect of CFA application on the crop growth was mainly caused by boron application. Based on the results of these examinations, it was presumed that the application of 2-3% CFA on v/v basis for the cultivation of Brassicaceae crops were appropriate. On the other hand, it was presumed that the application of 0.25-0.5% CFA on v/v basis for the cultivation of leguminous crop was appropriate. Thereby, we made plans to reduce the boron leaching from CFA for increasing usage of CFA as soil amendment. The plan was constituted of CFA with low boron leachability, landfill CFA, weathering, washing, and granulation of CFA.

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