SOURCE OF NITROUS ACID VOLATILIZED FROM UPLAND SOILS

概要

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In order to identify the source of nitrous acid volatilized from upland soils, two experiments were carried out:a ^<15≫N tracer experiment and an experiment on the effect of a nitrification inhibitor (thiourea) on nitrous acid volatilization. The following results were obtained. 1) The contribution rate of ammonium-N to the total nitrite-N volatilized was 63-64% in the Taki soil and 61-69% in the Matsuzawa soil, and that of nitrate-N was 23-26% in the Taki soil and 15-18% in the Matsuzawa soil. Recovery of ^<15>N was about 92-96% in both soils. 2) In both soils, the amounts of nitrous acid volatilized decreased by the addition of thiourea. The addition of thiourea-N at a concentration of 10% of the added ammonium-N almost completely suppressed the oxidation of ammonium-N to nitrite-N and nitrate-N in both soils. From these results, it is concluded that a large part of the volatilized nitrous acid originated from ammonium-N.
社団法人日本土壌肥料学会の論文