포화침출액법에 의한 시설하우스 토양의 유효인산과 전기전도도 Available Phosphours Phosphorus and Electrical Conductivity of the Saturated Extracts of Soils from the Plastic Film Houses원문보기
시설채소 재배지 토양에서 합리적인 토양관리 방안 마련에 필요한 기초자료를 얻고자, 집적된 인산의 수용성 특성과 이를 포화 침출액법 및 기존의 여러 가지 분석방법에 의한 유효인산과의 관계를 비교 검토하였다. 또한 포화 침출액이 전기전도도($EC_e$)와 (1:5) 전기전도도 사이외 상관관계를 구명하였다. 시료는 강원도 춘천시, 원주시, 홍천군, 횡성군 지역의 시설채소 단지에서 169개 지점의 토양을 채취하였고, 이들의 유효인산 및 전기 전도도 등의 화학적 특성을 분석하였다. 토양의 포화 침출액의 인(P) 농도의 범위는 $0.02{\sim}34mg\;L^{-1}$로 평균 $8mg\;L^{-1}$ 이었다. Lancaster법에 의한 토양의 유효인산($P_2O_5$) 함량 범위는 $136{\sim}3,389mg\;kg^{-1}$ 이었으며, 평균 $1,261mg\;Kg^{-1}$이었다. 수용성 인산의 함량은 $2{\sim}118mg\;kg^{-1}$ 범위로 평균 $39mg\;kg^{-1}$ 이었다. 포화침출액의 인산농도(Y)와 Lancaster법에 의한 토양의 유효인산 함량(X) 사이에는 유의성있는 관계가 있었다 (Y=-5.075+0.018X, $r=0.662^{***}$, P<0.01). 토양 중 수용성 인산 유출에 의한 수질오염 부담을 경감시키기 위해서, 포화 침출액 중의 수용성 인의 농도를 $1.0mg\;L^{-1}$이하로 유지하여야 하는데, 이 농도는 Lancaster법 추출에 의한 토양 유효인산 함량 $337mg\;Kg^{-1}$에 해당되었다. 포화 침출액의 토양 전기전도도 ($EC_e$)는 1:5 전기전도도 $EC_{1:5}$와 유의한 정의 상관관계를 나타냈으며 그 기울기가 12.2이었다.
시설채소 재배지 토양에서 합리적인 토양관리 방안 마련에 필요한 기초자료를 얻고자, 집적된 인산의 수용성 특성과 이를 포화 침출액법 및 기존의 여러 가지 분석방법에 의한 유효인산과의 관계를 비교 검토하였다. 또한 포화 침출액이 전기전도도($EC_e$)와 (1:5) 전기전도도 사이외 상관관계를 구명하였다. 시료는 강원도 춘천시, 원주시, 홍천군, 횡성군 지역의 시설채소 단지에서 169개 지점의 토양을 채취하였고, 이들의 유효인산 및 전기 전도도 등의 화학적 특성을 분석하였다. 토양의 포화 침출액의 인(P) 농도의 범위는 $0.02{\sim}34mg\;L^{-1}$로 평균 $8mg\;L^{-1}$ 이었다. Lancaster법에 의한 토양의 유효인산($P_2O_5$) 함량 범위는 $136{\sim}3,389mg\;kg^{-1}$ 이었으며, 평균 $1,261mg\;Kg^{-1}$이었다. 수용성 인산의 함량은 $2{\sim}118mg\;kg^{-1}$ 범위로 평균 $39mg\;kg^{-1}$ 이었다. 포화침출액의 인산농도(Y)와 Lancaster법에 의한 토양의 유효인산 함량(X) 사이에는 유의성있는 관계가 있었다 (Y=-5.075+0.018X, $r=0.662^{***}$, P<0.01). 토양 중 수용성 인산 유출에 의한 수질오염 부담을 경감시키기 위해서, 포화 침출액 중의 수용성 인의 농도를 $1.0mg\;L^{-1}$이하로 유지하여야 하는데, 이 농도는 Lancaster법 추출에 의한 토양 유효인산 함량 $337mg\;Kg^{-1}$에 해당되었다. 포화 침출액의 토양 전기전도도 ($EC_e$)는 1:5 전기전도도 $EC_{1:5}$와 유의한 정의 상관관계를 나타냈으며 그 기울기가 12.2이었다.
Management of phosphorus availability in the plastic film house soils in Korea merits attention because salts have been accumulated for last decades due to the heavy application of fertilizers and intensive cropping practices. In an attempt to characterize the P availability, available phosphorus co...
Management of phosphorus availability in the plastic film house soils in Korea merits attention because salts have been accumulated for last decades due to the heavy application of fertilizers and intensive cropping practices. In an attempt to characterize the P availability, available phosphorus contents and electrical conductivity of the saturated extracts ($EC_e$) were measured for soils collected from the 169 plastic film houses in Kangwon-do. Soil phosphorus contents were analyzed by methods of Lancaster, Bray No. 1, Olsen, Truog, water extractable and saturation extracts. Phosphorus concentrations in the saturated extracts of the plastic film house soils ranged from 0.02 to $34mg\;L^{-1}$, with the average of $8mg\;L^{-1}$. The available $P_2O_5$ of the soils ranged from 136 to $3,689mg\;Kg^{-1}$, with the average of $1,261mg\;Kg^{-1}$. The water soluble $P_2O_5$ ranged from 2 to $118mg\;L^{-1}$, with the average of $39mg\;L^{-1}$. A significant correlation existed between saturation extract P (Y) and available $P_2O_5$ (X) [Y = -5.075 + 0.018X, $r=0.662^{***}$] indicating $1.0mg\;P\;L^{-1}$ of in the saturated extract was equivalent to $337mg\;Kg^{-1}$ of the available $P_2O_5$ by Lancaster method. Electrical conductivity of the saturated pastes ($EC_e$) was highly significantly correlated with EC (1:5), yielding the slope of 12.2 for the coarse textured plastic film house soils. Results of higher concentrations of available P in soil solution and dilution factor of 12.2 for $EC_e$ demonstrate that a special care must be taken in terms of fertilizer management and data interpretation for soils under this specific condition.
Management of phosphorus availability in the plastic film house soils in Korea merits attention because salts have been accumulated for last decades due to the heavy application of fertilizers and intensive cropping practices. In an attempt to characterize the P availability, available phosphorus contents and electrical conductivity of the saturated extracts ($EC_e$) were measured for soils collected from the 169 plastic film houses in Kangwon-do. Soil phosphorus contents were analyzed by methods of Lancaster, Bray No. 1, Olsen, Truog, water extractable and saturation extracts. Phosphorus concentrations in the saturated extracts of the plastic film house soils ranged from 0.02 to $34mg\;L^{-1}$, with the average of $8mg\;L^{-1}$. The available $P_2O_5$ of the soils ranged from 136 to $3,689mg\;Kg^{-1}$, with the average of $1,261mg\;Kg^{-1}$. The water soluble $P_2O_5$ ranged from 2 to $118mg\;L^{-1}$, with the average of $39mg\;L^{-1}$. A significant correlation existed between saturation extract P (Y) and available $P_2O_5$ (X) [Y = -5.075 + 0.018X, $r=0.662^{***}$] indicating $1.0mg\;P\;L^{-1}$ of in the saturated extract was equivalent to $337mg\;Kg^{-1}$ of the available $P_2O_5$ by Lancaster method. Electrical conductivity of the saturated pastes ($EC_e$) was highly significantly correlated with EC (1:5), yielding the slope of 12.2 for the coarse textured plastic film house soils. Results of higher concentrations of available P in soil solution and dilution factor of 12.2 for $EC_e$ demonstrate that a special care must be taken in terms of fertilizer management and data interpretation for soils under this specific condition.
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문제 정의
This study was focused on the available phosphorus content in soil solution and electrical conductivity of the saturated extracts of the soils taken from the plastic film houses. A conversion factor from the conventional EC measurement (1:5) to ECe necessary for soil salinity estimation was evaluated from the model between the two variables.
이론/모형
Analysis of phosphorus concentration of the saturated extract was followed by the Molybdenum blue method (IAS, 1988) using aUV spectrophotometer. Electrical conductivity and pH of the extracts were also measured.
spectrophotometer. Available soil phosphorus was analyzed by SnCh reduction method with five difierent extractants : Lancaster method (2% HOAc +15% Lactic acid + 0.111% NH4F + 0.667% (NH4)2SO4 + 0.85% NaOH, pH 4.3), Bray No. 1 method (0.03N-NH4F + 0.025N HC1, pH 2.5), Olsen method (0.05M NaHCOs, pH 8.5), Troug method (0.002N H2SO4, pH 3.0), and soluble phosphorus by 1:10 distilled water extract.
Soil chemical properties were analyzed following the IAS methods (1988): NH4-N by indophenol blue method; NO3-N by Brucine method; and exchangeable cations by 1M- ammonium acetate extract method with an atomic adsorption spectrophotometer. Available soil phosphorus was analyzed by SnCh reduction method with five difierent extractants : Lancaster method (2% HOAc +15% Lactic acid + 0.
성능/효과
0 mgP L1 which correspond to the available P2O5 of 745 mg Kg. In our results, this available P2O5 content was equivalent to Psat of 8.3 mgPL1 and water extractable P2O5 of 26.2 mg Kg1. This discrepancy might be derived from diflerent interpretation of water soluble phosphorus measurement.
후속연구
(1998) considered the water soluble phosphorus concentration as P extracted by 1:10 batch method. A further research is needed on the exact definition of soluble phosphorus status, as an available indicator which is directly related with plant nutrition, and soil and water environmental qualities.
They reported that the phosphorus solubility of top soils was astride the R-TCP isotherm, and that of subsoil was below the /9-TCP isotherm. Further detailed researches were needed to explain the exact isotherm of high phosphorus concentration in the plastic film house soils.
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