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- 저자 : Min Ji Gang(강민지) (검색결과 3 건)
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Min Ji Gang(강민지),Chang Oh Hong(홍창오) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Plastic mulching film is often used to cultivate crops in upland soil, because it can control weed and increase crop productivity. However, it may increase the temperature and the moisture content of the soil, resulting in more nitrous oxide (N₂O) emission. The objectives of this study were 1) to compare the effect of different type of plastic mulching films on N₂O emission from upland soil and 2) to select the optimum plastic mulching film to reduce N₂O emission and increase crop yield. Surface soils were mulched with different types of plastic film including clear, permeated, conventional, and non mulching. Maizes were transplanted on 27<SUP>th</SUP> April and harvested on 4<SUP>th</SUP> August in 2020. Nitrous oxide flux peaked soon after applying nitrogen fertilizer and raining. The averaged water filled pore spaces (WFPS) in soil were 73.8, 61.9, 59.5, and 52.1 % with clear, permeated, conventional, and non mulching, respectively. The cumulative N₂O emissions were 4.99, 7.27, 5.35, and 4.08 kg ha<SUP>-1</SUP>, respectively. Changes of WFPS of soil mulched with different types of plastic film affected the cumulative N₂O emission from soils. The maize yields were 8.2, 17.5, 10.7, and 7.2 Mg ha<SUP>-1</SUP> with clear, permeated, conventional, and non mulching, respectively. We observed that the lowest value of yield scaled N₂O emission was 0.42 kg N₂O Mg<SUP>-1</SUP> with permeated mulching film. For economic viability and environmental conservation, we suggest that permeated plastic mulching film is the most effective to reduce N₂O emission per unit of crop production.
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Min Ji Gang(강민지),Chang Oh Hong(홍창오) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Ammonia (NH₃) that reacts with nitrogen oxides or sulfur oxides in the atmosphere is a key component contributing to the formation of fine particulate matter (PM<SUB>2.5</SUB>). Peat moss (PM) and zeolite (Z) having many negative charge on its external surface are widely used to increase cation exchange capacity (CEC) of soil. Negative charge of those materials might prevent volatilization of NH₃ by adsorption of NH₄<SUP>+</SUP> in the soil. Therefore, the objectives of this study were 1) to compare the effect of PM and Z on NH₃ volatilization from upland soil and 2) to select the optimum amendment and its application rate to reduce NH₃ volatilization and maintain crop yield. Field experiments were conducted from 2020 to 2021 to measure NH₃ volatilization from upland soil. Peat moss and Z were applied at the rates of 0, 1, 2, and 4 Mg/ha. Spring cabbages were transplanted and harvested on 8<SUP>th</SUP> April and 10<SUP>th</SUP> June in 2020, and 2<SUP>nd</SUP> April and 5<SUP>th</SUP> June in 2021, respectively. Ammonia flux peaked soon after applying nitrogen fertilizer and raining. The cumulative NH₃ volatilization decreased with increasing application rate of both materials. This was mainly attributed to NH₄<SUP>+</SUP> adsorption by increasing CEC of soil with application of both materials. The averaged cumulative NH₃ volatilization across application rates with Z was lower than that with PM, because the averaged CEC of soil across application rates with Z was greater than that with PM. Application rate of both materials did not affect cabbage yield in both years. We observed that the lowest value of yield scaled NH₃ volatilization was 5.60 g NH₃ kg<SUP>-1</SUP> at 3.76 Mg ha<SUP>-1</SUP> of Z application. As a result, Z was more effective soil amendment to reduce NH₃ volatilization and maintain crop yield from upland soil than PM.
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