배추재배 시 바이오차 펠렛 완효성 비료의 적정 시용량 구명

김희선(HuiSeon Kim),윤석인(SeokIn Yun),장은숙(Eunsuk Jang),신중두(JoungDu Shin) 유기성자원학회 2019 유기물자원화 Vol.27 No.1

본 연구의 목적은 배추재배 시 바이오차 펠렛 완효성 비료의 적정 시용량 구명을 위해 수행하였다. 바이오차 팰릿 완효성 비료는 돈분과 바이오차 혼합비(6 : 4)로 조제한 후 N : P : K 용액을 추가하여 총 질소 함량이 약 9%가 되도록 조제하였다. 본 시험의 처리는 대조구, 추천 질소 시비량의 바이오차 펠렛 완효성 비료 질소기준 40%(N 40%), 바이오차 펠렛 완효성 비료 질소기준 40% + 0.07M MgO(N 40% + 0.07M MgO)와 바이오차 펠렛 완효성 비료 질소기준 60%(N 60%) 시용구로 구성되어있다. 배추의 생육기간동안 토양 중 NH 4 -N, NO 3 -N, P 2 O 5 , K 2 O의 농도 변화를 분석하였다. 실험 결과로서 토양중의 NH 4 -N, NO 3 -N, K 2 O 함량은 대조구와 비교하여 N 40%처리구가 유의차를 보였다. 토양 중의 P 2 O 5 농도는 바이오차 팰릿 완효성 비료의 처리구들 중 N 40%가 가장 높았다. 배추의 생체중은 N 40% 처리구는 대조구와 비교하여 유의적인 차이가 나지 않았으며(p>0.05), N 40% + 0.07M MgO 처리구와 N 60% 처리구는 대조구에 비해 감소하였다. 농경지에서 배추재배 시 추천 질소 시비량 기준의 N 40%가 적정 시용량이라 판단된다. This experiment was conducted to select an optimum application rate of blended biochar pellet as slow release fertilizer during cabbage cultivation. The blended biochar pellet made with a combination(4:6) of biochar and pig manure compost with unloading N, P, K solutions for adjusting about 9% of total nitrogen(TN). The treatments were consisted of the control as recommended application rates for cabbage cultivation in National Institute of Agricultural Sciences, N 40%, N 40% and 0.07M MgO and N 60 % of the blended biochar pellet, respectively, based on nitrogen application of recommended rates to cabbage cultivation. Changes of NH 4 -N, NO 3 -N, P 2 O 5 and K 2 O concentrations in the soil and growth characteristic and yield components were investigated and observed during the cabbage cultivation. The experimental result shown that contents of NH 4 -N, NO 3 -N and K 2 O of soil in the N 40% were significantly difference(p<0.01) with the control. P 2 O 5 concentrations of soil in the N 40% were highest among the treatments. The fresh weight per cabbage in the N 40% was not significantly different(p>0.05) from the control, but in the N 40% and 0.07M MgO and N 60% was lower than that of the control. It was considered that an optimum blended biochar application rate for cabbage cultivation was 40% of recommended nitrogen application.

개량한 왕겨 바이오차에 대한 암모늄태 질소의 흡착능 평가

김희선(HuiSeon Kim),김민진(MinJin Kim),박도균(DoGyun Park),윤석인(SeokIn Yun),장은숙(EunSuk Jang),신중두(JoungDu Shin) 유기성자원학회 2019 유기성자원학회 학술발표대회논문집 Vol.2019 No.춘계

This experiment was conducted to evaluate its adsorption capacity of modified rice hull biochar. The biochar treated with 6M KOH solution was carbonized at 850℃. The maximum adsorption of NH4 + -N in aqueous solution and maximum removal rate were 0.65 mg g -1 and 56.3 %, respectively, in 6M KOH modified biochar. For palm biochar, the maximum adsorption and removal rate of PO4 - -P were 0.67 mg g -1 and 56.0%, respectively. It was observed that NH4 + -N in aqueous solution can be only adsorbed in rice hull modified biochar, and PO4 - -P in palm biochar. The sorption of NH4 + -N to 6M modified rice hull biochar was significantly fitted(p<0.001) by Langmuir isotherm model because it was observed that dimensionless constant (RL) was 0.39. The maximum adsorption amount (qm) and binding strength constant (b) were calculated as 0.65 mg g -1 and 0.057 mg L -1 , respectively. Furthermore, the leaching experiment of modified rice hull biochar mixed with soil need to be more elucidated in the future.

옥수수재배 시 바이오차팰렛 시용량에 따른 토양 화학성 변화에 미치는 영향

박도균(DoGyun Park),김혜원(HyeWon Kim),김희선(HuiSeon Kim),장은숙(EunSuk Jang),신중두(JoungDu Shin) 유기성자원학회 2019 유기성자원학회 학술발표대회논문집 Vol.2019 No.춘계

Objectives of this experiment were to investigate the changes of soil chemical properties and estimate carbon sequestration according to application rates of blended biochar pellet during corn cultivation. The treatments were MgO (40% N + 0.07M MgO), and 60% of blended biochar pellet (60% N) based on the recommended application rates of fertilizer for corn cultivation by National Institute of Agricultural Sciences. Application amounts of 10a -1 and 440kg 10a -1 , respectively. Nitrogen fertilizer was separately applied at 2 times as basal and additional application and the other were applied with whole basal application before transplanting. However, blended biochar pellets were applied as whole basal application with different rates. Chemical analysis was performed in the runoff water and soil, and then measured fresh biomass weight for biomass growth responses of corn to different blended biochar application rates. For the results of this experiment, it shown that the residual contents of NH4-N, NO3-N, P2O5 and K2O in the treatments of blended biochar application rates were lower than those of the control through corn cultivation periods. However, the K2O contents in the treatments were higher than those in the control at 21 days and 51 days after corn transplanting. NH4-N and NO3-N contents of runoff water in the control appeared to be higher than those of the blended biochar pellet treatments, but PO4-P and SiO2 contents did not significantly different (p>0.05) between the control and blended biochar application plots. Carbon sequestration (60.0 kg 10a -1 ) did not significantly different between the control and 40% N + 0.07M MgO treatment plot. Fresh biomass weights in the control were not significantly different with all the treatments except for the 60% N even if reduction of nitrogen fertilizer application were decreased 60% relative to the control. Therefore, it was decided that application of blended biochar pellet for corn cultivation was potential benefit to enhance the nutrient use efficiency as well as reduction of the chemical fertilizer mounts for corn cultivation in agricultural practices.

토마토 재배를 위한 바이오차 최적시용 비율 평가

박도균(Do-Gyun Park),홍승길(Seung-Gil Hong),장은숙(Eunsuk Jang)신중두(Joung-Du Shin) 유기성자원학회 2019 유기물자원화 Vol.27 No.1

본 연구의 목적은 원예작물을 대상으로 밭에서 바이오차 시용에 따른 토마토 재배 시 바이오차의 적정 시용비율을 구명하고, 탄소 격리량을 산정하는 것이다. 바이오차는 0.01%, 0.03%, 0.05% 및 0.07%(w/w, 토양/바이오차)로 구분하여 처리하였으며, 비료는 N-P-K, 20.4-10.3-12.2 kg 10a -1 를 기비와 추비로 나누어 시용하였고, 돈분퇴비는 440 kg 10a -1 를 기준으로 전량 기비로 투입하였다. 토양 이화학성의 결과를 보면 토양중의 NO 3 -N 함량은 바이오차 처리 9일 후 가장 높게 나타났지만 처리간 유의성은 없었지만(p>0.05) NH 4 -N 함량은 바이오차 처리 후 14일 후바이오차 처리구에서 낮게 나타났다. 토양중의 P 2 O 5 함량은 바이오차 처리 후 19일 후 0.01%를 제외한 바이오차 처리구에서 낮게 나타났다. 토양 중 K 2 O 함량은 바이오차 처리 후 6일 때 대조구와 비교하였을 때 0.01%와 0.03%가 높게 났다. 하지만 다른 처리구와 비교 하였을 때 유의차가 인정되지 않았다. 질소 효율성을 보면 0.05%에서 가장 높았으며, 또한 토마토 생육도 바이오차 처리량에 관계없이 좋았다. 바이오차 0.05% 시용구에서 질소 효율성 및토마토 생육과 수량이 가장 높게 나타났다. 바이오차 투입량 변화에 따른 탄소 격리량 산정에서는 0.03% 처리에서 2.83 mg kg -1 으로 가장 높게 나타났지만, 토마토 수량 측면에서 바이오차 적정 시용비율은 0.05%라고 판단된다. Objective of this study was to evaluate an optimum biochar application rate and estimate the carbon sequestration based on the soil chemical properties and growth responses for biochar application during tomatoes cultivation. The treatments consisted of control as recommended application rates of fertilizers, 0.01%, 0.03%, 0.05%, and 0.07% of biochar application(w/w, biochar:soil). For effects of soil chemical properties, the NO 3 -N contents in the soil were peaked at 9 days after transplanting. But there was not significant difference(p>0.05) among the treatments during cultivation periods. However, NH 4 -N contents in the biochar treatment were lower than the control until 14 days of transplanting. P 2 O 5 contents in the biochar treatments were lower than that of the control until 19 days after transplanting except 0.01% of biochar application plot. K 2 O contents in soils treated with 0.01% and 0.03% of biochar were higher until 6 days after transplanting than that in the control. For N use efficiency of biochar application, it was observed that the 0.05% biochar application plot was highest among the treatments. The highest carbon sequestration was estimated at 2.83 mg kg -1 for 0.03% of biochar application. However, it is considered that the optimum biochar application rate was 0.05% for tomato cultivation, considering the growth characteristics and yield components.

토마토 재배 시 바이오차 펠렛 완효성 비료의 적정 시용량 구명

김민진(MinJin Kim),김희선(HuiSeon Kim),박도균(DoGyun Park),이창규(ChangGu Lee ),윤석인(Yun SekIn),장은숙(EunSuk Jang),신중두(JoungDu Shin) 유기성자원학회 2019 유기성자원학회 학술발표대회논문집 Vol.2019 No.춘계

본 연구의 목적은 토마토 재배 시 바이오차 펠렛 완효성 비료의 적정 시용량을 구명하기 위해수행하였다. 바이오차 펠렛 완효성 비료는 돈분과 바이오차를 (6 : 4)로 혼합하고 주요 양분을 분사하여 조제하였다. 바이오차 펠렛 완효성 비료 처리구는 질소기준 40%(N 40%), 50%(N 50%), 70%(N70%)로 구분하여 처리하였고, 전량 기비로 시용하였다. 대조구의 시비량은 11.6-10.3-4.1 kg 10a-1 (N-P-K)을 기비와 추비로 나누어 2회 분시 하였고, 퇴비는 440 kg 10a-1를 기준으로 전량 기비로 시용하였다. 그 결과 토양 중 질소 Balance를 산정하였을 때 바이오차 펠렛 N 40% 처리구에서80%로 가장 높게 산정 되었으며, N 50% 처리구에서는 63.5%로 산정 되었다. P2O5의 농도는 전체생육기간 동안 대조구가 가장 높은 값을 보였고, K2O의 함량은 토마토 재배시기가 지남에 따라 점차적으로 감소하며, 처리 후 10일을 기점으로 감소하는 경향을 보였다. 토마토 수량은 대조구와 비교하여 N 50% 처리구에서 유의차가 없었다. 따라서 토마토 재배 시 바이오차 팰렛 완효성 비료의 적정시용 비율은 관행적인 시비량의 절반인 질소기준 약 6 kg 10a -1인 것으로 판단된다.

산업용 보일러의 NOx저감을 위한 연소실 반응장 해석

엄태인,장재덕,조재광,이상길,장은숙 한밭대학교 생산기반기술연구소 2001 생산기반기술연구소 논문집 Vol.1 No.1

Numerical analysis of reaction in the combustor has been performed to study the flow and temperature fields for the NOx reduction using SNCR(Selective Non Catalytic Reduction) technology for industrial boiler, 30tons of steam an hour with the case of full load. Recently NOx emission can be controlled through thermal reactions by using appropriate reducing chemicals, ammonia and urea etc., whose solution is sprayed into the flue gas including NOx. SNCR is an attractive method from point of view that no catalyst is required, in which NO reduced to N_2 and H_2O. The good mixing and sufficient residence time of reducing agent are key parameter in industrial boiler for NOx reduction in this method. In this study, the flue gas flow and temperature fields are calculated in order to design the optimal SNCR system using numerical calculation. The recirculation area generated near the wall of combustor appears to be important parameter for flame stability and flue gas residence time. The calculation result of temperature profiles agree with experimental data on the cross-sectional are in at the rear of combustor. These results suggests the optimum nozzle point and angle of the chemical injection.