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 (505Kb)
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16,760,000 Yen (FY1997;5,639,000 Yen)
We examined degradation of N2O emission which derives from fertilization nitrogen at the grassland. With the use of slow N-release fertilizer, coated N fertilizer, calcium nitrate, chemical fertilizer added nitrification inhibitor, it declined than the high analysis mixed fertilizer of the practice. Grass yield was equal to the case with chemical fertilizer added nitrification inhibitor and calcium nitrate, where applied practice fertilizer. The ground temperature was high and the time when there were many rainfalls, the use of slow N-release fertilizer, coated N fertilizer were shown grass yield which is equal to the practice fertilizer was gotten. In the grassland, CH4 absorption was admitted in any fertilizer examinations. Then, we planned the way of N2O emission being able to be about 50% degradation to use chemical fertilizer added nitrification inhibitor or slow N-release fertilizer compared with the practice fertilization.
CH4 emissions were decreased when cow slurry was applied, soil injection, soil mix application and ditch application compared to surface application, but N2O emissions were increased conversely. CH4 emissions from stored slurry after aeration were about 1/10 reduced compared with no aeration. However, N2O emission was admitted by the one of aeration way. When it applied stored liquid after aeration by surface application, CH4 emission became less than 1/10 compared with no aeration, and N2O emission became less than 1/2. Therefore, the aeration of slurry before store was effective with the CH4 emission reduction for field application. The CH4 emission during aeration was less than 1/4 compared with no aeration, and N2O emission didn't admitted. When comparing CH4, N2O emissions according to the way of slurry treatments, it became the order which is no aeration stored slurry > stored liquid after aeration.
Grassland, Nitrous oxide, Methane, Animal waste, Nitrogen fertilizer