• 한국토양비료학회지
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• 제46권5호
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• pp.365-372
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• 2013

Crop development and nutrient availability are strongly influenced by soil salinity levels. This study was conducted to investigate the effect of rice straw and nitrogen (N) fertilizer for silage barley under various soil salinity levels at Saemangeum reclaimed tidal land. Three levels of rice straw (0, 2.5, 5.0 ton rice straw $ha^{-1}$) and N (0, 150, 225 kg N $ha^{-1}$) were applied at 0.04, 0.23, 0.35% soil salinity levels. Biomass yield of silage barley was influenced by the interactions between rice straw application and N fertilization. Although there was no single effect of rice straw application on biomass yield, it was significantly increased with N application and a rice straw application of 5.0 ton $ha^{-1}$. Sodium content in silage barley was significantly lower at 0.04% salinity level, and but it was statistically increased with increasing soil salinity levels. Forage qualities such as total digestible nutrients and relative feed value of silage barley were significantly higher with N application at 0.04% salinity level, but there was no effect of rice straw application. Soil organic matter content was increased with N and rice straw application regardless of soil salinity level. The results of this study showed that the effect of rice straw and N fertilization on silage barley was influenced by soil salinity levels, which indicates that the management practice of silage barley at Saemangeum reclaimed tidal land should consider soil salinity levels.

• 한국환경복원기술학회지
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• 제8권1호
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• pp.1-9
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• 2005

This study was conducted to establish a management plan for the Sangrim Woodlands restoration by analyzing the site characteristics of the Sangrim Woodlands Natural Monument(Natural Monument 154) in Hamyang-Gun, Gyoungsangnam-Do, Korea. Site preparation to enhance soil aeration should be applied because soil bulk density in all study sites was higher than soil compaction of natural forest soil area. Herbaceous plants could be introduced to hard soil strength for restoration of areas compacted by visitors. Also, visitors around forest areas should be restricted to enhance natural soil restoration. Soil pH in the Sangrim Woodlands was between 4.18 and 4.90. The values were lower than pH 5.34 of Korean forest soil originated from metamorphic parent materials. Lime fertilizer could be applied to reduce soil acidification in the woodlands. Short and long-term management plans such as periodical fertilizations to improve plant growth should be established to restore the Sangrim Woodlands which have high soil compaction, low soil pH and organic matter content.

• 한국토양비료학회지
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• 제49권6호
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• pp.795-806
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• 2016

This study was conducted to improve the continuous techniques for international competitiveness of ginseng industry to Korea-China FTA negotiation and conclusion, and provide the basic information for ginseng industry development of Korea. It was carried out the visiting of the northeastern three provinces (Jilin, Liaoling and Heilongjang) in China for 3-year from 2014 to 2016 and observed the farmers' fields of ginseng cultivation with soil environmental status. The types of ginseng cultivation could be observed in small scales of 0.5~3.0 ha, in middle scales of 4.0~10.0 ha and in large scales of 30~700 ha with the kinds of imhasam, Chinese ginseng, Korean ginseng and western ginseng. Also ginseng was cultivated in newly reclaimed land of forest in two types of direct seeding and transplanting of ginseng seedlings. The field beds of ginseng growing were covered with vinyl films in arch design of 100~130 cm height and vinyl was painted in spraying with blue, green and yellow colours for shading. It was investigated in status of the physico-chemical properties of soils. The physical information on the field soils were silt loam, loam and sandy loam in soil textures, and some plain in low slope, some alluvial fan or local valley in forest of land topography. Soil pH ranged within 5.0~5.2, soil EC was $0.93{\sim}3.78dS\;m^{-1}$, organic matter was $37{\sim}35g\;kg^{-1}$, nitrate nitrogen $63{\sim}490mg\;kg^{-1}$, available $P_2O_5$ $55{\sim}163mg\;kg^{-1}$, and in exchangeable cations, K was 0.30~0.98, Ca was 6.5~14.0, Mg was $1.1{\sim}5.3cmol_c\;kg^{-1}$ in ranges. Farmers used the fertilizer for ginseng cultivation in 10~11 t of compost, $200{\sim}400kg\;ha^{-1}$ of complex fertilizer and $750kg\;ha^{-1}$ of oil cakes. The northeastern three provinces of China can use the newly lands with large areas of ginseng cultivation in soil sickness by continuous cropping. and the soil basic fertility is batter than that of Korean in standard guide of ginseng cultivation soil.

• 한국토양비료학회지
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• 제30권1호
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• pp.62-66
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• 1997

논토양에 대한 전산화(電算化)된 정밀토양조사자료(精密土壤調査資料)를 이용(利用)하여 논토양(土壤) 유형별(類型別) 13개(個) 물리화학적인 특성의 평균치(平均値)를 구하고 토양개량(土壤改良)에 대한 기초자료(基礎資料)를 제공하고자 전산자료를 분석, 검토한 결과는 다음과 같다. 1. 논토양 B층위(層位)에서의 점토함량은 보통답(普通畓)이 28.3%, 사질답(砂質畓)이 11.8%, 미숙답(未熟畓)이 26.8%이었으며 토양 pH는 습답(濕畓), 특이산성답(特異酸性畓)을 제외하고는 B층(層)이 A층(層)보다 높았다. 2. 보통답중(普通畓中)에서 하천변(河川邊)논 A, B층의 점토함량은 각각 16.8%, 23.1%로 가장 낮았고 유기물함량은 42g/kg, 18g/kg로 가장 많았으며 유효인산함량도 가장 많았다. 3. 논토양 유형별(類型別) B층(層)의 유기물함량수준별 분포비율(分布比率)은 사질답, 미숙답은 10g/kg 이하가 가장 많고 특이산성답을 제외한 각 답유형에서는 10~20g/kg 범위가 가장 많았다. 4. 보통답(普通畓) B층위(層位)에서 물리화학성 상호간의 상관계수(相關係數)는 전부 1~5% 수준내에서 유의성(有意性)이 높았다.

• 한국토양비료학회지
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• 제40권6호
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• pp.488-494
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• 2007

고랭지 농업은 표고가 높은 산지의 경사지에서 이루어지고 있고, 비료 및 퇴비 등의 고투입농법에 의존하고 있기 때문에 토양유실 가능성이 상당히 높고 따라서 환경에 악영향을 미칠 가능성이 크다. 이 연구는 식생을 이용한 토양 유실저감효과를 규명하기 위하여 경제성이 있는 산채작물을 재배함으로서 이들의 토양 유실 저감 정도를 평가하였다. 2005년 실험에 따르면 배추포장에 비하여 눈개승마와 참취 포장의 토양 유실량은 1/2로 저감되었으며, 유출량 또한 상대적으로 눈개승마 재배 포장과 침취 재배 포장에서 낮은 것으로 나타났다. 경사도(15%, 30%, 45%)에 따른 토양유실량은 경사도가 증가할수록 증가하였으며, 15% 포장에서 눈개승마의 경우 52.50 kg, 30% 포장에서 눈개승마의 경우 108.33 kg, 45% 포장에서 눈개승마의 경우 171.50 kg로 나타났으며, 배추포장의 경우는 눈개승마 포장에 비해 2~3배 많은 토양 유실량을 보였다.

• 한국유기농업학회지
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• 제26권4호
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• pp.619-628
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• 2018

This study analyze the economic effect of chemical fertilizer. We used the input and output data, and the analysis variables include production output nitrogen, phosphoric acid, potassium, seeds, and labor. The main results are as follows. First, for spring potatoes, potassium increases to a certain level of output, but over a certain stage, the output decreases as the input increases. Optimal use of potassium in the calculation of spring potatoes can achieve the effect of reducing input costs and increasing output simultaneously. Second, radish In autumn, nitrogen increases to a certain level, but over a certain stage it represents a reverse U-shaped relationship in which output decreases as input increases. This means that reducing the amount of fertilizer input increases the output. This means that soil-related agricultural big data can contribute to the management of nutrients and greenhouse gas reduction in agricultural land.

• 한국토양비료학회지
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• 제39권2호
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• pp.86-94
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• 2006

우리나라 고품질 완전미의 안전생산을 위한 적정 질소시비량을 설정하기 위하여 2003-2004년에 전국 24 농가포장을 대상으로 논토양 유형별로 재배시험을 수행하였다. 토양유형별 쌀 수량, 완전미 수량 및 단백질 함량은 질소시비수준이 증가할 수록 많아지는 경향이고, 토양유형별 완전미 비율 및 Toyo 식미치는 질소시비수준이 증가하면 오히려 낮아지는 경향을 보였다. 지역별로 본 수확기 실물체와 쌀의T-N 함량과 단백질함량도 질소 시비량 증가로 많아지는 반면, Mg/K 당량비는 오히려 질소 감비로 증가하는 경향이었다. 고품질미의 안전생산을 위하여 하향 조정된 논토양 유형별 질소의 적정시비량은 ha당 보통논, 사질논, 고논 80-100 kg(89 kg), 미숙논 90-110 kg (100 kg), 염해논(숙답) 100-130 kg(112 kg) 이었다.

• 한국토양비료학회지
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• 제44권5호
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• pp.722-726
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• 2011

The management standard on soil conditions in 'Fuji' apple to produce high quality fruit were not yet made. Therefore, this study was carried out to investigate the optimum soil environmental conditions of ten contents on production of high quality fruit in 'Fuji' apple. The soil and fruit characteristics were analyzed at total 60 orchards in major apple producing areas such as Chungju, Moonkyeung, yeongju, andong, yeosan and yeongcheon (10 orchards an area). The soil environmental factors affected fruit weight was highest relative contribution in saturated hydraulic conductivity of 36.5%. The bulk density and soil pH were low as relative contribution. The fruit weight was influenced by soil physical properties more than soil chemical properties. The soil environmental factors affected sugar content were hydraulic conductivity of 28.3% and organic matter content of 18.2%. The cultivation layer depth and soil pH were low as relative contribution. The fruit coloring was highest relative contribution in saturated hydraulic conductivity 55.9%. while soil pH, cation and soil texture were low. Fruit coloring was high influenced over 70% by soil physical properties. Finally, relative contribution on fruit quality related with sugar content, fruit weight, and coloring were high influenced by saturated hydraulic conductivity of 21.% and organic matter content of 18.7% but bulk density and cultivation layer depth were low relative contribution. The fruit growth and saturated hydraulic conductivity in 'Fuji' apple were very closely related. Therefore, orchard soil management to produce high quality fruit was very importance drainage management and organic matter application. We concluded that scientific soil management is possible by qualifiable of soil management factors.

• 한국토양비료학회지
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• 제47권2호
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• pp.80-84
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• 2014

Phosphorus (P) is an essential nutrient for all living organisms. P is mostly obtained from mined rock phosphate. However, existing rock phosphate reserves could be exhausted in the next 50-100 years. As Korea is totally dependent on imported rock phosphate, we should seek for solution to overcome the P depletion by efficient use and recycling. For this, this study suggested a P flow model to identify the location and flow route of P in urban area based on traditional material flow analysis. The type of P entering the urban areas are fertilizer, food and feed. Each type of P is used in agriculture, human consumption and animal husbandry. After going through each process, P is moved to waste management facilities within food waste, excreta and sewage. Some portion of P in waste are buried, incinerated and discharged, which can be reservoir of P in the future.

• 한국토양비료학회지
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• 제49권6호
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• pp.669-676
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• 2016

A field study was conducted to determine the runoff loss of N and P in small scale of red pepper field plots (10% slope), consisting of three different plots with black polyethylene vinyl mulching (mulching), ridge without mulching (ridge), and flat without ridge and mulching (flat). Composted manure and urea as a basal application were applied at rates of $20MT\;ha^{-1}$ and $93kg\;N\;ha^{-1}$, respectively. Urea at $189kg\;N\;ha^{-1}$ and fused phosphate at $67kg\;P_2O_5\;ha^{-1}$ were additionally applied on June 25 with different fertilization methods, broadcast application in flat plot and hole injection in ridge and mulching plots. Plant uptake of N and P was positively correlated with their respective concentrations in surface soil: mulching > ridge > flat plots. The runoff loss by soil erosion was higher in flat plot than ridge and mulching plot with contour line. Nitrate loss by the runoff water had no significant differences among three surface management practices, but the higher average value in ridge and mulching plots than flat plot. Especially, the flat plot had no phosphate loss during summer season. This is probably due to low labile P content in surface soil of flat plot. In the summation of soil and water loss, flat plot was higher in N and P loss than ridge and mulching plot with contour line. Nevertheless, the nitrate and phosphate loss by runoff water could be more important for non-point source management because the water could meet the river easier than eroded soil because of re-deposition around slope land.