Demonstration of Discrepancy in N Remaining Rate of Organic Matter Evaluated by N Content and ^<15>N Content in the Glass Fiber-Filter Paper Bag Method (Fertilizers and Soil Amendments)

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^<15>N-labeled rice straw, wheat straw, and cattle manure sawdust compost were used to evaluate the N remaining rate of organic matter by the application of the glass fiber-filter paper bag method, and to demonstrate the discrepancy between the N remaining rate of organic matter evaluated by the N content and the N remaining rate of organic matter directly evaluated by the 15N content. In all three kinds of organic matters examined, a discrepancy in the N remaining rate of organic matter was observed between the evaluation by the N content and the evaluation by the ^<15>N content. Loss of N from organic matter was observed using the ^<15>N content, though the N remaining rates of wheat straw and rice straw evaluated by the N content were above 100% throughout the experimental period. The N inflow into and N outflow from the glass fiber-filter paper bag occurred simultaneously. The discrepancy between the N remaining rate of organic matter evaluated by the N content and the N remaining rate of organic matter evaluated by the 15N content became larger as the C/N ratio of organic matter increased.
社団法人日本土壌肥料学会の論文