窒素肥料の土壌中に於ける行動追跡元素として : N^<15>の利用に就て

概要

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Heavy nitrogen isotope of 5.67 atom % N^<15> excess in the form of ammoium sulfate was added along with some soluble starch to the soil, previously air dried and not dried respectively. The soils were incubated three weeks at30℃ under waterlogged condition followed by the analysis of NH_4-N, humic-N, non-humic-N (Hopson-Page) contents. As revealed by massspectrum analysis of N^<15> the nitrogen fractions in the humic and non-humic N originated from the inorganic N^<15> were considerably high, the effect of air drying resulting in the less transformation in the organic nitrogen as compared with non-drying. The analitical results were discussed in comparison to the ordinary method of substraction (plot in question - check plot), the latter undoubtedly gave unreliable results.
社団法人日本土壌肥料学会の論文
1950-12-30