• Korean Journal of Soil Science and Fertilizer
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• v.43 no.2
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• pp.160-165
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• 2010

To reduce the dose of fertilizers is very important to sustainable production of many horticultural crops, including strawberry. In order to practice the environment friendly agriculture of strawberry cultivation in plastic film house, soil chemical properties of 435 soil samples (232 for loam, 83 for sandy loam, and 120 for silt loam) in Chungnam Province from2008 to 2009 were determined. The average of pH, EC, OM, Av. $P_2O_5$, Ex. $K^+$, Ex. $Ca^{2+}$, Ex. $Mg^{2+}$, and Ex. $Na^+$ was 6.5, 2.28 dS $m^{-1}$, 26 g $kg^{-1}$, 910 mg $kg^{-1}$, 1.09 $cmol_c\;kg^{-1}$, 8.3 $cmol_c\;kg^{-1}$, 2.5 $cmol_c\;kg^{-1}$, and 0.58 $cmol_c\;kg^{-1}$, respectively. The content of Av. $P_2O_5$ in sandy loam soil was significantly higher than silt loam soil, whereas other properties showed no difference between soil texture. The kinds of strawberry cultivars showed no difference in soil chemical properties. The frequency distribution within optimum range of soil chemical properties was 30.6%, 35.4%, 37.0%, 5.3%, 8.5%, 8.5%, and 17.9% for pH, EC, OM, Av. $P_2O_5$, Ex. $K^+$, Ex. $Ca^{2+}$, and Ex. $Mg^{2+}$, respectively. Especially, excessive portion of Av. $P_2O_5$, and Ex. $Ca^{2+}$ were high 86.9%, and 86.0%, respectively. EC values of soil samples were significantly positive correlatoin with all chemical properties except soil pH. In principle component analysis of chemical properties in soil samples, the percentage of variance explained by PC 1 was 38.8%, while PC 2 explained 17.8%of the variance, for a cumulative total of 56.6%. These results were able to distinguish between soil textures and strawberry cultivars. Also, these results considered that understanding of soil chemical properties under using principal component analysis be able to improve amounts of fertilizers for sustainable agriculture in plastic film house.

• Korean Journal of Soil Science and Fertilizer
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• v.33 no.4
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• pp.234-241
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• 2000

Organic farming (OF) is regarded as alternative farming types against general farming system for sustainable agriculture, recently. However, there is little information on effects of OF on soil properties and watershed condition. In order to determine the effects of OF on soil properties, 36, 10 and 8 sites of organic farming (OF) fields of plastic film houses, paddy and orchard were selected in the national scale, respectively, to evaluate their chemical properties and phosphorus distributing characteristics. The average organic matter (OM) contents in organic farming fields were with $44g\;kg^{-1}$ in plastic film houses, $26g\;kg^{-1}$ in paddies and $39g\;kg^{-1}$ in orchard soils higher than the average OM contents in conventional farming (CF) soils. Available phosphates were accumulated to 986 in plastic film house soils and $754mg\;kg^{-1}$ in orchard soils, respectively, over the optimum range. Furthermore, total P (T-P) reached to $2.973mg\;kg^{-1}$ in plastic film houses and $2303mg\;kg^{-1}$ in orchards in OF soils. It could be attained by applying repeatedly low N/P ratio of manure-based compost. In two types of soils inorganic P was dominant with the ratio of 62~80% of T-P, and then residual and organic Ps followed. However. residual-P was dominant in paddy soils with the rate of 50% of T-P. Fractionation of soil extractable P showed that Ca-P was dominant with about $1,330mg\;kg^{-1}$ in upland soils in OF fields, which is affected by high soil pH of over 6.0. However. Fe-P of extractable P was dominant in paddy soils. Water-soluble P was very high with 65 and $26mg\;kg^{-1}$ in plastic film house and orchard soils in OF. From this results. OF regarded as an environment-friendly farming system may cause serious soil deterioration by accumulated phosphorus and may also cause water pollution.

• Journal of The Korean Society of Grassland and Forage Science
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• v.23 no.1
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• pp.31-36
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• 2003

This pot experiment was conducted te find out the effects of kieserite application ($T_1$; control, $T_2$; standard amount of $N-P_2$$O_{5}$ $-K_2$0, $T_3$; $T_2$+ kieserite) on the seedling vigour and yield of pass/clover mixed swards on newly reclaimed hilly soil. The results obtained are summarized as follows: At the $T_1$ treatment the seedling vigour and yield of mixed forages were very poor, whereas they were remarkedly enhanced by the treatments of $T_2$ and $T_3$. Comparing with the $T_2$ treatment the forage yields were increased 3.1% in orchardgrass, 27.5% in ladino clover, and 12.8% in mixed forages by the application of kieserite($T_3$). In the grass-clover mixed swards, the application of kieserite more remarkedly influenced the seedling vigour, botanical composition, and yield of clover than those of grass.

• Korean Journal of Organic Agriculture
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• v.5 no.2
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• pp.71-84
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• 1997

유기농산물은 질 좋은 농산물이며 그 생산농법이 환경친화적인 것으로 이해하고 있어 참여농가수도 증가일로에 있고 소비자들에 의한 유기농산물 구입 역시 점차 증가 추세에 있으나, 한국유기농업은 국제적 유기농업에 다르게 잘못 정의된 채 확산되고 있어, 그 핵심기술의 환경영향평가의 과학화에 대한 시대적 요청과 유기농업 기본규약 제정 필요성이 학계 일부에서 제기 되고 있는 등 한국유기농업은 최근 발전을 위한 진통을 겪고 있다. 이에 본 논문은 한국유기농업이 태동된 배경과 70년대 말로부터 80년대 초에 걸쳐 태생된 한국유기농업이 국민적 관심을 얻게된 배경과 정농회, 한국유기농업협회, 한국자연농업협회, 한 살림 등의 유기농업단체와 한국유기농업학회, 환경보전형농업생산소비단체협의회, 흙살림연구소 등의 발전과정 및 활동을 소개하고 있다. 또한 서울에서 개최된 IFOAM Asia대회, 한국자연농업협회의“자연농업연구소”, 한국유기농업협회의“건강과 자연농업”등에 관해서 뿐만 아니라 우리 정부의 21세기를 향한 농림환경정책중 유기농업부문에 대한 각종 장기지원책, 즉 중소농대책의 일환의 유기-자연농업 지원책, 유기농산물에 대한 품질인증제 및 팔당상수원보호구역내 유기농업지원 등이 소개되고 있다. 한편 한국유기농업기술의 핵심내용이었던 유기질비료 과다시용 문제가“유기농산물 채소의 고 질산염 함량”으로 촉발된 식품안정성 논쟁 후에 유기질비료의 추천시용량이 다다익선적 개념에서 80t/㏊으로 낮아졌다가 다시 50t/㏊으로 낮아졌으며 1996년 6월부터는 20t/㏊로 크게 낮추어 졌음을 보고하고 있다. 또한 일부 선도적 유기독농가의 경험적 기술이 토대가 되어 성립된 현 유기농업기술은 과학적 기술검증을 거쳐야 함과 퇴비사용 만으로 실시하는 현 유기농업 기술에 의해 야기되는 근권내 질산 미치 인산염 집적을 회피하기 위해서는 윤작, 녹비작물 및 두과작물의 재배로 토양비옥도 향상을 통한 유기농업 기술 개발이 필요하며 IFOAM 기본규약과 FAO/WHO Codex의 핵심 내용을 수용하는 한국유기농업 기본규약 제정이 제정이 절실히 요구됨을 강조하고 있다. 마지막으로 한국유기농업의 핵심기술에 대한 환경영향평가와 기본규약제정 필요성을 역설하고 한국유기농업의 과학화와 질 좋은 유기농산물 생산을 위해 노력하고 있는 소비자 문제를 연구하는 시민의 모임 등 몇몇 단체들의 최근 활동이 언급되고 유기농업에 대한 농과대학내 연구와 강의 등이 소개되었다.

• Journal of Korean Society of Forest Science
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• v.90 no.3
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• pp.363-372
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• 2001

The objective of this study was to investigate the site and growth characteristics of dominating Cornus controversa in the hardwood stands at Mt. Gariwang and Mt. Joongwang area located in Pyungchang-gun, Kangwon-do. The C. controversa was mainly distributed at the rather steep slope and aspect facing from northeast to northwest, and altitudes ranging from 800 to 1,100m. The C. controversa grew at relatively deep A soil layer with high moisture and nutrients. Major competing species in upper stories were Quercus mongolica, Acer mandshuricum, Salix hulteni, Acer pictum, and herb plants such as Polystichum tripteron, Dryopteris crassirhizoma, Meehania urticifolia, Pseudostellaria pahbiniana, Ligularia fischeri, Impatiens noli-tangere, Corydalis speciosa in the floor. The average annual diameter growth of C. controversa according to the altitude was $4.06({\pm}0.90)mm$ below 900m, $2.51({\pm}0.65)mm$ from 900 to 1,000m, $3.28({\pm}0.12)mm$ from 1,000m to 1,100m and $2.81({\pm}0.35)mm$ above 1,100m. Good annual growth was shown at northwest site, but no difference due to micro-topography.

• Korean Journal of Agricultural and Forest Meteorology
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• v.1 no.2
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• pp.81-89
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• 1999

To propose basic information for natural resource management and conservation strategy of Schisan-dra nigra Maxim., its habitat environment and vegetation structure of forest communities growing the species was investigated. Fourteen plots (each plot size 400 $m^2$) were set up at the distributed area of Cheju island, southern part of Korea. S. nigra is the economic useful species that scatteringly grows at 850~920 m in the western part, at 660~710 m in the northern part and at 750~1,250 m in the southern part of Mt. Halla. The community of S. nigra in Mt. Halla is the mixed secondary forest of pine and broad leaved trees that are mainly composed of Pinus densif1ora, Quercus serrata, Styrax japonica, Lin-dera erythrocarpa and Carpinus laxiflora. The density in a main distribution sector of S. nigra appears in the range of 3~39 individuals per each 20$\times$20 m plot. The distribution patterns by Morisita's Index showed that S. nigra was distributed randomly in all of the stands. The association analysis showed that the following tree species were positively associated with S. nigra. In other words, the following trees were appeared to require the same ecological niche together with S. nigra: Lindera erythrocarpa, Cornus waltri, Acer mono, and Styrax japonica.

• Korean Journal of Medicinal Crop Science
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• v.4 no.1
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• pp.19-26
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• 1996

The crop rotation of rice and ginseng in paddy field has very important meaning because up-land field suitable for ginseng cultivation is now being insufficient day by day in main ginseng production area. This studies were conducted to define basic problems related to ginseng cultivation and replanting in paddy field. In Keumsan district, the most serious problem on ginseng cultivation in paddy field was excess of mineral salts left behind in the soil of rice cultivation. The amounts of organic matters, CEC and the mineral elements including potassium were higher in the soil of paddy ginseng field compared to those of upland. Plant growth of 3 and 4 year old ginseng and root yield of four year old ginseng cultivated in paddy field of 1st and replanting were not decreased compared to those of 1st - planting of up-land field, but those were significantly decreased in replanted compared to those of first planted upland field. Crop rotation with ginseng and rice in paddy field seemed to be a good way to avoid hazards of continuous cropping of ginseng with it's outyield of root and less infection of diseases. Amounts of crude saponin and ginsenosides of ginseng cultivated in paddy field were not differ from those of upland field.

• Korean Journal of Soil Science and Fertilizer
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• v.9 no.4
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• pp.251-256
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• 1976

Langmuir adsorption maximum was used as a basis for the estimation of phosphate requirement as related to the application method to a newly reclaimed hilly land. The application rates of phosphate fertilizer were 4 levels corresponding to 5, 10, 20, and 30 percent of the Langmuir adsorption maximum which was determined by the laboratory experiment. The phosphate fertilizer was applied in two different methods of broadcast and band application. Yield of soybean on a newly reclaimed hilly land was greatly affected by the amount of phosphate fertilizer and application method. With the same amount of phosphate fertilizer, the soybean yield in the broadcast was always lower than that in the band application even though the yield in the broadcast increased with the application rate up to the highest level of this experiment. However, the yield in the band application showed steep increase up to 20 percent level and then the yield decreased at the highest level. The yield at the rate of 5 percent with the band application was equal to the yield at the rate of 20 percent with broadcast, and the yield at the rate of 10 percent with band application was higher by 17 percent than that in the highest broadcast rate. When manure was applied at the rate of 1000 kg/10a to the plot of the 10 percent band application, the yield was 14.6 percent higher than the yield of the plot of the 10 percent band application without the manure and was equivalent to the yield of the plot of the 20 percent band application.

• Korean Journal of Soil Science and Fertilizer
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• v.44 no.6
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• pp.1144-1149
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• 2011

The occurrence of Korean pine (Pinus koraiensis) advance growth has been noticed in the deciduous oak forest being adjacent to the mature Korean pine plantation. the korean pine seedlings in the forest were regenerated naturally from harvested and transported Korean pine seeds and cones by rodents, mainly red squirrels. Mongolian oak (Quercus bariabilis), which formed dominant overstory, had close-to-normal distributions of height, diameter and age classes. Korean pine, which dominated the understory, had the reverse J-shaped height, diameter and age distributions that are expected of a shade tolerant species. Growing in the summer shade of the oak, Korean pine seedling had slow, but steady height growth during the past four decades. Total biomass of Korean pine seedling ranged from $2,835-8,541kg\;ha^{-1}$ and biomass allocation of Korean pine seedling was follows : stem (with bark) > foliage > branches > roots. Korean pine seedlings allocated more biomass to foliage and branches compare to planted Korean pine. The smaller root/shoot ratio of Korean pine seedling in the site is to believed to be result of competition for light. Contents of N and K for Korean pine seedling were greatest in foliage follow by branches, stem ad roots, while content of P was greater in the order of foliage > roots > stem > branches.

• Journal of the Korea Organic Resources Recycling Association
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• v.27 no.3
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• pp.41-48
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• 2019

Mixed expeller cake has been one of soil management to improve crop productivity and soil fertility. But, there was a little information on optimum mixed expeller cake application for chinese cabbage. So, in this study, we were evaluated the preplant optimum application rate of mixed expeller cake(MEC) in chinese cabbage cultivation at field. Treatments consist of control, inorganic fertilizer($N-P_2O_5-K_2O$ : $320-78-198kg\;ha^{-1}$), MEC(50, 100, 150% on preplant application standard $110kg\;ha^{-1}$ as N, topdressing : $210kg\;ha^{-1}$ as N). In results, growth characteristics was not significantly different. But, yield was increased when application rate was increased. And MEC 150% treatment showed similar yield as inorganic treatment. There was no significant difference in soil pH, OM, $Av.P_2O_5$, $NH_4-N$ and Ex.K. But, soil EC and $NO_3-N$ were increased when MEC level increased. As a results, MEC 150% can be proposed as preplant optimum application rate of MEC from this study. But abuse of MEC and long-term using caused about salt accumulation in soil.