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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.