Studies on the Denitrification in the Submerged Paddy Soil -1. The Denitrification Rates Upon the Different Levels of Nitrogen Fertilizer in Sandy Soil

논토양(土壤)의 탈질작용(脫窒作用)에 관(關)한 연구(硏究) -제(第) 1 보(報). 사질답토양(砂質畓土壤)에서 질소시비량(窒素施肥量) 차이(差異)가 탈질(脫窒)에 미치는 영향(影響)

  • Published : 1985.06.25

Abstract

A laboratory experiment was conducted to find out the denitrification rate upon the different levels of nitrogen fertilizer in submerged sandy soil. The results obtained were summarized as follows: 1. The highest denitrification rate was observed at 25 days after incubation. The amount was reached at 1830 ug/100g soil for 20mg nitrogen was applied in 100g soil. 2. Increases of fertilizer nitrogen was enhanced the rate of ammonification and nitrification during the incubation time. 3. Deep correlation was observed between the denitrification capacities which was determined as nitrous oxide and Mitchaelis-Menten kinetic with relation to nitrate concentration. More higher denitrification rates were observed in Mitchaelis-Menten kinetic than dentrification rate with determined as nitrous oxide. 4. A Zero order (with relation to nitrate concentration) kinetic model for denitrification was presented in this experiment condition to illustrate the variability of nitrous oxide concentrations in the submerged soil atmosphere.

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