黒土の腐植に関する研究(第2報) : 各種溶剤に依る溶解量と炭素率に就て

概要

論文の詳細を見る
F. m the black soil covering the Daisen plateau authors separated humus by various solvents, and determined its carbon and nitrogen content. The results obtained may be summarized as follows : (1) The humus solubility caused by various solvents is in the following order, Page reagent>2%-NaOH>1%-Na_2CO_3>1% Na-Oxalate. The solubility in Page reagent was nearly equal to that in boiled 2% NaOH solution. (2) The part soluble in 2% NaOH was removed and the residue was boiled in boiled 2% NaOH solution for thirty minutes. It seems that the soluble humus thus obtained, the fraction soluble in 2% boiled NaOH solution, was markedly greater than the humus soluble in other solvents in its carbon content and its carbon-nitrogen ratio and therefore it was clearly different from the other fractions. (3) Humus content is commonly calculated by multiplying carbon content by 1.724,but in the case of black soil this factor is not, by the author's opinion, proper for the purpose. (4) Concerning the high productive paddy soil the part of the humus soluble in boiled 2% NaOH was greater, and the carbon-nitrogen ratios of this part and also of the part insoluble in boiled 2% NaOH were especially small. (5) It came under the authors observation that not only the quantity of Humine, Fulvic acid, Hymatomelanic acid and Humic acid contained in humus but also the composition of each of these parts markedly varied according to the samples used. (6) The authors determined A type as well as B type-humus according to Simon's method. However, it is still doubtful whether the productivity of soil can be judged by these results. (7) The humus in field soil consists mostly in the Waksman's lignin-humus complex and protein, but the high productive paddy soil is now increasing its content of cellulose and hemicellulose.
社団法人日本土壌肥料学会の論文
1953-10-01

黒土の腐植に関する研究(第2報) : 各種溶剤に依る溶解量と炭素率に就て

スポンサーリンク

概要

著者

関連論文

スポンサーリンク