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| Takeshi Shibuya Researcher | |
| Mountainous Region Branch, National Grassland Research Institute, | |
| Ministry of Agriculture, Forestry & Fisheries. | |
| 375-1 Shiono, Miyota, Nagano, 389-0201 Japan | |
| Phone +81-267-32-2356, FAX +81-267-32-2318 | |
| E-mail: mirage@ngri-a.affrc.go.jp |
8,438,000 Yen
(FY1999; 4,057,000 Yen)
So far, we measured methane (CH4) and nitrous oxide (N2O) fluxes at the grassland in91, 95, 96, 97, in 98. Moreover, it measured CH4 and N2O fluxes at the slurry applications with several times. And, it got these gas fluxes data by Upland Field Management Laboratory of Kyushu National Agricultural Experiment Station and Soil Science Section of Hokkaido Prefectural Konsen Agricultural Experiment Station. Based on these data, we made the emission factor index for CH4 and N2O from grassland and animal waste. This emission factor index is the revise of the index that was made in 94(B-2.4.2 Emission of Trace Gases Contributing Greenhouse Effect from Grassland by GERF). Besides, we made the emission factor indexes of slurry application methods and nitrogen fertilizers.
We have proposing the management that N2O emission could be effectively reduced by the change in the kind with nitrogen fertilizer, and degraded CH4, N2O emissions at slurry application on field by the mixing and aeration method before slurry store (B-16.3 Studies of Control and Activities of Greenhouse Trace Gases in Grassland by GERF). The our proposing N2O emission decreasing method after fertilizer application made fertilizer cost up about 17-51%, compared with conventional fertilizer application. And so, the mixing and aeration before slurry store showed that it cost about 2,000,000 yen as an annual cost in the way of disposing of it.
Furthermore, we did impact assessment to effect on greenhouse effect in the grassland animal husbandry system by using the index which influenced grass area and which was revised, CH4, N2O emissions inventory of domestic grassland in Japan, Global Warming Potential (GWP). The result, it was shown that nitrogenous fertilizer, animal excreta (slurry) had large impact for greenhouse effect, and it thought that these were to become the objects of the measurement and research that it was necessary for intensively.
Grassland, Nitrous oxide, Methane, Animal waste, Nitrogen fertilizer