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古谷 修, 古川 智子, 小堤 恭平. "3 家畜ふん堆肥の成分分析による30℃、4週間培養無機態窒素率の簡易推定法(東北支部講演会,2006年度各支部会)." Abstracts of the Annual Meetings, Japanese Society of Soil Science and Plant Nutrition 53.0 (2007) 241