著者

市村 三郎

出版者

一般社団法人 日本土壌肥料学会

雑誌

日本土壌肥料学雑誌 (ISSN:00290610)

巻号頁・発行日

vol.26, no.1, pp.20-24, 1955

---

Sphagnum, carex middendorffii, Eriophorum and phrogmites peat, found widely in Hokkaido, had moisture 85-95%, while solid part 5-15%. Peat solid contains organic matter 88-92%, and mineral matter 8-12%. Organic components of peat were fractionated as follows; torfbitumina, watersoluble substance, hemicellulose, cellulose, and humic acid, the main component peing humic scid. It was considered that the humic acid was a complex substance from the decomposed substance of plant lignin; the compound included nitrogenous substance (main component is protein). This included nitrogenous substance was the decomposed compound of bacteria carcass produced, in the decomposition of peat. Inorganic components of peat were made of substances from the residue of plant, accompanied with soils and volcanic ash. Potassium content in the peat was specially less than that of the original plants. Main component of peat was the compound of humic acid and mineral base, with which water-soluble substance, cellulose and hemicellulose were mixed or compounded. It was found that peat was a substance coated with torfbitumina and this coating lowered its absorbed capacity for potassium. This lawering induced the author to recognized that the some parts of mineral bases, from soil and ash, were combined chemically with the peat. Peat had very strong acidity, because the main component was humic acid of low base status. pH of peat was 3.05-3.69.