• Korean Journal of Soil Science and Fertilizer
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• v.27 no.3
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• pp.215-219
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• 1994

This experiment was tried for finding out some soil chemical problems when new apple trees were replanted in old orchards. Soil samples were collected from the soil horizons in the old apple orchards cultivated over 40 years and reference soils. The non-cultivated reference soils were located near the old apple orchards and each of the soils was showed as the same pedon with each of the cultivated soils. The results were as follows : Soil pH showed a tendency to decrease in low horizons of the cultivated soils whereas increase in those of the uncultivated soils. As a comparision with each chemical component, the content of exchangeable Ca or total Mn was likely to be deficient in the cultivated soils. But all components except those were not like that. Total exchangeable cations in the cultivated soils were lower than in uncultivated soils. The pH in the cultivated soils showed very high positive correlation with total exchangeable cations. From those result, it was assumed that lower pH in lower horizon which would be originated from low content of total exchangeable cations, reacts as a factor for the deterioration of old apple orchard soil.

• Asian Journal of Turfgrass Science
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• v.24 no.2
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• pp.205-210
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• 2010

This study was conducted to investigate the effect of the mixed ratio of the soil amendments, peat, humate, peatmoss and zeolite, on the soil physicochemical properties. The mixed ratios of soil amendments were 0%, 3%, 5%, 7% and 10% (v/v) incorporated with sand which met to the USGA (United State of Golf Association) recommendation. It was measured pH, EC and CEC as a chemical properties. Porosity, capillary porosity, air-filled porosity, bulk density and hydraulic conductivity were also measured to analyze the changes of physical properties. Chemical properties were significantly different by mixture ratios of peat, humate, peatmoss and zeolite. When the results were applied to the USGA standard of the soil physical properties, the optimum mixture ratios of peat, humate and peatmoss were 5%, 3% and 7%, respectively. Air-filled porosity was factor involved in soil physical properties by blending with soil amendments and it was affected on volume of porosity and hydraulic conductivity. To analyze the corelation of mixture ratio versus to physical characters, the ratio of peat and peatmoss was significantly related to capillary porosity and hydraulic conductivity (P<0.05), that of humate hydraulic conductivity (P<0.01), and that of zeolite air-filled porosity and volume of porosity (P<0.05). These results could be used as a basic data for construction USGA sand green.

• Journal of Sericultural and Entomological Science
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• v.32 no.1
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• pp.5-7
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• 1990

Soil chemical properties of 60 mulberry fields from 29 farms in Kyunggi Province were analyzed. The results were: 1. Average soil pH was 5.52: organic matter, 1.74%; available phosphorus, 572ppm; and exchangeable potassium, 0.62me/100g. Values for available P and pH were greater than data collected in 1983, especially for available P which was four times the value obtained in 1982. 2. Ninety two percent of mulberry fields required lime (less than pH 6.5), 90% had low organic matter content (less than 3.0%), 22% were low in K, and 15% were low in P (less than 0.5me/100g and 200ppm, respectively). However, 50% of the fields had greater than 200ppm P. The maximum concentration of P found was 2117ppm. 3. These results suggest that the amount of phosphate applied annually may be readjusted in standard fertilizer and in three-nutrient fertilizers for mulberry fields.

• Proceedings of the Korean Society of Organic Agriculture Conference
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• 2009.12a
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• pp.303-303
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• 2009

시설재배지의 연작장해 원인이 토양병해 35%, 염류집적 30%로 분석하고 있으며, 시설재배지의 40% 이상이 토양EC 4dS/m 이상으로 작물생육에 부적합한 염류집적 토양으로 추정하고있다. 연작 및 집약적인 시설 재배의 불가피성을 감안한 시설재배의 장기적인 토양관리를 위하여 녹비작물을 활용한 물질순환적 토양관리를 위하여 토양 EC가 상이한 3개(<2.0dS/m, 2.0~6.0dS/m, 6.0dS/m<)토양에 거울철 휴한기에 호밀, 밀, 청보리를 재배하고 토양에 환원한 후 수박을 재배하여 시험을 수행하였다. 녹비작물의 건물중생산량은 호밀이 601~722kg/10a, 밀이 433~607kg/10a, 청보리가 648~690kg/10a 이었으며, 토양EC가 높은 토양(6.0dS/m<)에서 가장 낮은 경향이었다. 녹비작물 재배 후 토양의 EC는 호밀재배에서 24~44%, 밀재배에서 19~38%, 청보리재배에서 23~39% 경감효과가 있으며, 3개 토양 평균 각각 녹비작물별 토양EC 경감 효과는 호밀, 밀 그리고 청보리 각각 37%, 31% 및 35%의 경향을 보였다. 녹비작물 재배 후 수박을 재배한 결과 수박의 생육 및 수량성은 토양 및 녹비작물 간에 뚜렷한 차이를 보이지 않았으나, 무재배에 비해서는 녹비작물재배 토양에서 약간 양호한 경향을 보이고 있어, 장기적으로 계속 재배할 경우 토양의 물리화학성 개선 및 작부체계 개선에 의한 연작장해 경감 효과를 기대할 수 있을 것으로 사료되었다.

• Weed & Turfgrass Science
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• v.6 no.3
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• pp.262-271
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• 2017

This study was conducted to evaluate incorporation ratio of soil amendment 'Profile' to improve soil physicochemical properties and turfgrass growth. The soil amendment was added 0 (sand only), 3, 5, 7, and 10% to USGA Green-spec green sand soil. As incorporated with more 'Profile' amendment, soil electrical conductivity (EC), cation exchangeable capacity (CEC), capillary porosity and total porosity of root zone were increased than those of control, while bulk density and hydraulic conductivity decreased. Turfgrass index and clipping yield of creeping bentgrass grown in sand soil incorporated with 7% 'Profile' were improved than those of control. Correlation coefficient of turf color index and incorporation ratio of the soil amendment 'Profile' was found to show significantly positive correlation. These results indicated that application of the soil amendment 'Profile' to sand soil in golf course green improved turfgrass growth and quality by increasing CEC and porosity of root zone.

• Korean Journal of Soil Science and Fertilizer
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• v.27 no.2
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• pp.105-110
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• 1994

Field experiment was carried out to obtain the basic information on the soil improvement with different improved methods on job's tears yield and soil properties in the newly-reclaimed land from 1985 to 1988. Job's tears yield, soil properties and annual changes of soil were investigated and analyzed. Soil bulk density and hardness of topsoil decreased from 1st year to 3rd year, but those increased in 4th year. Soil pH of topsoil had no differences in different soil depths and cultivated years. Average yield of job's tears in the integrated improvement plot was 2.16ton/ha. That was increased by 49% than the control plot. Crop yield was greatest in order of integrated improvement>subsoiling>phosphate>lime>compost>control plot. Correlation coefficients of job's tears yield with soil pH and organic matter content were higher significantly. Also those of subsoil were higher than topsoil. Ratios of annual changes of soil bulk density and hardness showed significant highly with job's tears yield. Also that soil pH was significant at 5 % level in the topsoil.

• Korean Journal of Soil Science and Fertilizer
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• v.36 no.5
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• pp.304-310
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• 2003

Effects of different amounts of fertilizer and manure application on changes of chemical and biological properties of soil were studied in plastic film house. Application amount of fertilizer was determined on the basis of soil test, standard application rate, and conventional rate of farmers. Lettuce in the first and second seasons and spinach in the third season were cultivated. Crop yields were highest in the plot fertilized on the basis of soil test during the three crop seasons. In the third crop season, spinach yield was lower in conventional plot applied with larger amount of pig manure compost than any other treatment. Organic matter, available phosphorus, and exchangeable potassium were accumulated in soil of the conventional plot with successive cropping. There was no difference in the abundance of soil invertebrates among the treatments, but soil enzyme activity was highest in the conventional plot.

• Journal of Wetlands Research
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• v.24 no.2
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• pp.69-82
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• 2022

In this study, we investigated the bacterial community structure in organic rice-fish mixed farming paddy soil by using high-throughput sequencing technology. The results showed that compared with the organic rice cultivated soil, the content of AP (available phosphorus) increased by 310.23 % and the content of OM (organic matter) increased by 168.83%. The most abundant phyla in paddy soils were Proteobacteria, Bacteriodetes, and Chloroflexi, whose relative abundance was above 47.83%. Among the dominant genera, the relative abundance of Limisphaera in paddy soils was observed. Alpha diversity indicated that the bacterial diversity of paddy soils was similar among each other. The bacterial community structure was affected by the relative abundance of bacteria, not the species of bacteria. Principal Coordinated Analysis (PCoA) results showed that the bacterial communities in organic rice-fish mixed farming soil and organic paddy soil were correlated to each other; the bacterial community structure was distinctively grouped by four different systems (paddy soil under organic rice-fish mixed farming system, organic rice cultivation, and conventional rice cultivation), where the first two are closely related to each other than the third one. The results provide basal support for organic agri-cultivation while improving an ecological value at the same time.

• Asian Journal of Turfgrass Science
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• v.17 no.4
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• pp.147-154
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• 2003

This experiment was carried out to study an effect of liquid fertilizer contained amino acids(LFcAA) on the growth of bentgrass(Agrostis palustris Huds. penncross) and the change of soil chemicals characteristics. The utilization of nitrogen in soil was increased more 70.6∼90.1％ in the treatment of LFcAA than in control. Fresh weight, dry weight and concentration of T-N, Mg and chlorophyll were increased in grass treated LFcAA. These results suggested that treatment of LFcAA was promoted utilization of nitrogen in soil and growth of bentgrass.

• 한국생태학회:학술대회논문집
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• 1999.05a
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• pp.113.2-113.2
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• 1999