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Tae Il Moon(문태일),Kwan Soo Choi(최관수),Hyun-Hwoi Ku(구현회) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
The amount of complex fertilizer (N-P₂O<SUB>5</SUB>-K₂O) used by Korean farms was 921 tons, which is the most applied in agricultural soils as of 2017 years. The complex fertilizer generates ammonia (NH₃) gas, which is a precursor to secondary particulate matter (PM<SUB>2.5</SUB>). It is vital to understand the emission characteristics as ammonia emission is dependent on the source of nitrogen fertilizer input and level of application. This study was conducted to identify the emission characteristics of ammonia by fertilizer input during the cultivation of pears. Four levels (0, 25, 50 and 100kg N ha<SUP>-1</SUP>) of complex fertilizer were applied to the soil (loamy soil). To determine cumulative ammonia emission during the season (early March to end of Octorber in 2021 year) we trapped and measured the gas concentration from the soil using dynamic chamber method. The sampling was done at least twice per week and immediately analyzed NH₃ concentration using nesslerization method. Result showed that the the application of fertilizer produced NH₃ emission and showed the peak within 5 days after application followed by a decreasing trend. Cumulative NH₃ emissions in each treatment were 2.0 (N 0), 2.3 (N 25), 2.6 (N 50), and 2.9 (N 100) kg NH₃ ha<SUP>-1</SUP> season<SUP>-1</SUP>. Applying the each cumulative amounts of NH₃ emission in the treatment, an ammonia emission factor from complex fertilizer was 8.9 kg per tons (Y=0.0089x+2.066, R²=0.953*) (Fig. 1). Our result could enable us to investigate ammonia emission factor from complex fertilizer during the pear cultivation period evaluate emission characteristics. 〈수식 본문참조〉
Tae Il Moon(문태일),Yun-Ji Lee(이윤지),Ji Soo Lee(이지수),Hyun-Hwoi Ku(구현회) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Agriculture accounts for 78% of the total domestic emissions of ammonia (NH<SUB>3</SUB>), a precursor of secondary fine particulate matter (PM<SUB>2.5</SUB>). NH₃ emitted from the soils varies depending on soil pH condition of various soil environment, so it is necessary to calibrate an ammonia emission factor based on the soil pH level. This study was conducted to calibrate NH₃ emission factor from complex fertilizer applied in loamy soil. To adjust soil pH levels (pH 4, 6, 8, and 10) we used the stock solutions (2N-H₂SO₄ and 2N-NaOH). And we applied complex fertilizer (N-P₂O<SUB>5</SUB>-K₂O=12-7-9) in the different application levels (0, 50, 100, and 200 kg N ha<SUP>-1</SUP>) and mixed with the soils for incubation study. During the experiment, the soil moisture content was 70% of the field capacity, and the constant temperature was maintained at 25°C. Results showed that the response of the fertilizer application was linearly increased. Also, the cumulative NH₃ emission was increased with increased soil pH levels. We could determine ammonia emission factors in the pH 4, 6, 8, and 10 based on the cumulative amount of ammonia emissions. Applying the each ammonia emission factor the calibration factor affected by soil pH condition was Y=0.0028exp(1.187x) (Fig. 1). The results of this study can be used as basic data for estimating ammonia emissions in different crops cultivated soils with complex fertilizers. 〈수식 본문참조〉
Tae Il Moon(문태일),Hyun-Hwoi Ku(구현회) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Ammonia (NH₃) is a precursor of secondary-generated particulate matter (PM<SUB>2.5</SUB>) which is emitted into the atmosphere during the biogeochemical reaction in soils. The amount of ammonia emitted is dependent largely on the source of the nitrogen fertilizer and the application rate. To investigate ammonia emission factor from complex fertilizer (N-P₂O<SUB>5</SUB>-K₂O=12-7-9) application in apple cultivated soil this study was conducted at a farmers field, Anseong city. Four levels (0, 50, 100 and 200 kg N ha<SUP>-1</SUP>) of complex fertilizer were applied to the soil (Sandy loam soil). To determine cumulative ammonia emission during the season (early March to end of Octorber in 2021 year) we trapped and measured the gas concentration from the soil using dynamic chamber method. The sampling was done at least twice per week and immediately analyzed NH₃ concentration using nesslerization method. Result showed that the the application of fertilizer produced NH₃ emission and showed the peak within 7 days after application followed by a decreasing trend. Cumulative NH₃ emissions in each treatment were 1.7 (N 0), 2.6 (N 50), 3.0 (N 100), and 3.6 (N 200) kg NH₃ ha<SUP>-1</SUP> season<SUP>-1</SUP>. Applying the each cumulative amounts of NH₃ emission in the treatment, an ammonia emission factor from complex fertilizer was 9.0 kg per tons (Y=0.009x+1.94, R²=0.923*) (Fig. 1). The result of this study is therefore suggested to be used as basic data to update emission factors having evaluated the characteristics of ammonia emission based on nutrient input during the apple cultivation period. 〈수식 본문참조〉