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許奉九,金武成,許一鳳 경희대학교 부설 식량자원개발연구소 1991 硏究論文集 Vol.12 No.-
This study was carried out to evaluate the optimum ranges of soil physico-chemical properties on the soybean cultivation. Field conditions were equal or similar in topography, soil texture, meteorological factors and managemept. Relationships between soybean yield and soil properties were investigated and analyzed. Bulk densities of topsoil and subsoil in the area where soybean grew well were 1.10g/㎤ and 1.23g/㎤ respectively. The optimum ranges of soil three phases were identified as the solid-phase below 50%. liquid phase below 25%. and air phase above 25%, Soil pH and organic matter were 5.4. 1.95 % respectively in the well grown area. The contents of exchangeable cations and cation exchange capacity in the well grown area were higher than those of poor grown area. Also those content of topsoil were higher than those of subsoil. Correlation coefficient of soil moisture related to the clay content was lower than that of clay+silt content, but that of topsoil was higher than subsoil. Soybean yield was highly correlated with physico-chemical properties except bulk density and Mg content, also relationships with chemical properties were higher than that of physical properties.
許奉九,金武成,許一鳳 慶熙大學校 1990 論文集 Vol.19 No.-
This study was carried out to evaluate the optimum ranges of soil physico-chemical properties on the soybean cultivation. Field conditions were equal or similar in topography, soil texture, meteorological factors and management. Relationships between soybean yield and soil properties were investigated and analyzed. Bulk densities of topsoil and subsoil in the area where soybean grew well were 1.10 g/㎠ and 1.23g/㎠ respectively. The optimum ranges of soil three phases were identified as the solid phase below 50%, liquid phase below 25%, and air phase above 25%, Soil pH and organic matter were 5.4, 1.95% respectively in the well grown area. The contents of exchangeable cations and cation exchange capacity in the well grown area were higher than those of poor grown area. Also those content of topsoil were higher than those of subsoil. Correlation coefficient of soil moisture related to the clay content was lower than that of clay+silt content, but that of topsoil was higher than subsoil. Soybean yield was highly correlated with physico-chemical properties except bulk density and Mg content, also relationships with chemical properties were higher than that of physical properties.
자연패사(自然貝砂)의 특성과 토양산도 교정력(矯正力)에 관한 연구 : 제주도 및 진도산을 중심으로
박영대,이윤환,한기학,김복진,허일봉 한국농화학회 1972 Applied Biological Chemistry (Appl Biol Chem) Vol.15 No.3
The characteristic and efficiency of natural shell sand in the coast of Cheju-Do and Jin-Do were studied to apply as agricultural lime for the soil acid adjustment. 1. The alkalinity of shell sand from Cheju coast was higher than that of Jindo and more weathered into fine particles. The particle size distributions of Cheju shell sand were condensed finer particles than 32 mesh in Cheju shell sands and in more coarser particles than 32 mesh in Jindo one. 2. The effect of Cheju shell sand on increasing soil pH value in the upland condition was low at the beginning but more gradually increased after 8 weeks from the treatment than ground lime, and Jindo was very dull during the period of treatment. The commercial lime crushed from Jindo was approximately equal to the ground lime. 3. In the submerged condition, the shell sand of Cheju reacted with soil acid more quickly than ground lime after 2 days, and Jindo was very slow. 4. The relative efficiency of various particle size fraction of the shell sand was superior to the ground lime. The lime particles between 9 to 14 mesh and 20 mesh had more remarkable difference of pH value than other fine particles. The efficiency among finer sizes than 20 mesh particle was approximately equal to each others. 5. The shell sand from the Cheju would be applied directly as agricultural lime without any treatment, and Jindo also can be expected to be effective as agricultural lime with crushing procedure.