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Please use this identifier to cite or link to this item: http://hdl.handle.net/10466/3104

Title: 稻藁堆肥腐植の分離と其の性質に就て(第1報) : 腐植分類の一新法(農藝化学)
Other Titles: On the Separation and the Character of the Humic Matters of the Compost from Rice Straw : I A new method on the fractionation of humus (Agricultural Chemistry)
Authors: 野田, 昌也
立野, 恒夫
Author's alias: NODA, Masaya
Issue Date: 25-Dec-1952
Publisher: Naniwa University
Citation: Bulletin of the Naniwa University. Ser. B, Agricultural and natural science. 1952, 2, p.75-82
Abstract: The method of factionation of humic matters was studied for clarifying the nature of humic matters in manure or compost, avoiding the denaturation as far as possible, and a new process was proposed as follows: A sample of manure was extracted by N/8 Na-oxalate solution as Simon's process. The extract was flocculated by inorganic acid, and the flocculate was treated by Simon's pH 4 buffer solution after being washed by dist water. The soluble part is the Simon's so-called "true humic acid", which will be abbreviated as "e. h. s. I" hereafter. The residue of Na-oxalate extraction was washed by 0.05 N HCl to remove Ca ion, and treated by 0.5% NaOH or 5% NaOH. The NaOH extracted humic matter was treated by Simon's buffer solution and another true humic acid was obtained, which will be abbreviated as "e. h. s. II" hereafter. The residual part was separated by Na-acetate solution (pH 4~pH 7), and the soluble part by this solution was named "rotten product". The humic matter which was sparingly soluble in Na-acetate solution (over pH 7), was called "lignic acid" tentatively. By these processes, various humic fractions could be distinguished as follows: (1) what is combined with Ca and replaceable easily by Na-oxalate (2) what is combined with R_2O_3, SiO_2 or clay and is inextractable by Na-oxalate, and (3) other various humic matters which are supposed to be combined together. The samples of these humic fractions were analysed for their moisture, ash, carbon and nitrogen contents. The carbon contents of e. h. s. I, e. h. s. II (treated by 0.5% NaOH) and e. h. s. II (treated by 5% NaOH) were 52.4, 52.0 and 52.1% respectively, and the N-contents of e. h. s. I and e. h. s. II were 3.60 and 3.99%. The N-content of e.h.s. II was greater than that of e.h. s. I, but the C-content was almost equal.
URI: http://hdl.handle.net/10466/3104
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