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「環境土壌学1」 - shimane-u.ac.jp · ・鉱質土壌(岩石由来の比較的有機物の少ない土壌):0.5-5% ・黒ぼく土壌:8-40% ・泥炭土 :20-100% 腐植は次の二つの物質に分けて考えられる。
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