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Despite the large number of papers and books published on soil organic matter (humus), our knowledge of the subject is still very limited, as is our knowledge of humic acid. The author of this book began to study humus at the end of the 1940s and continued until 1984 when he retired from Nagoya University. With the intention of establishing a systematic understanding of soil organic matter, he has compiled facts and a discussion of humus based on his extensive experimental results during the past 40 years.In this book, humic acids are classified into A, B, Rp and P types, based on th

Humus --- Humic acid --- Acides humiques --- Humus. --- Soils --- Mold, Vegetable --- Mould, Vegetable --- Muck --- Organic matter in soil --- Soil organic matter --- Vegetable mold --- Histosols --- Organic fertilizers --- Compost --- Plant litter --- Humic acid content. --- Organic matter --- Composition --- Soil chemistry