• Current Research on Agriculture and Life Sciences
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• 제8권
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• pp.65-70
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• 1990

선충기생(線蟲寄生)곰팡이(Paecilomyces lilacinus)를 이용(利用)한 당근뿌리혹선충(線蟲)(Meloidogyne hapla)의 생물학적방제(生物學的防除) 가능성(可能性)을 규명(糾明)하기 위(爲)하여 Telone II, Telone C-17, Dowfume MC-II 등(等) 3종(種)의 토양훈증제(土壤燻蒸劑)와 함께 밀양(密陽)의 시설원예포장(施設園藝圃場)에 처리(處理)하여 상치와 고추를 전후작실험(前後作實驗)한 결과(結果), 뿌리혹선충(線蟲) 밀도(密度)는 처리후(處理後) 25일(日)에 P.lilacinus 처리구(處理區)는 22마리, Telone II, Telone C-17, Dowfume MC-II구(區)는 각각(各各) 2, 24, 0마리로 무처리구(無處理區)의 685마리에 비(比)해 현저(顯著)히 낮았으며 처리후(處理後) 350일(日)에는 P. lilacinus, Telone II, Telone C-17, Dowfume MC-II구(區) 각각(各各) 2,917, 173, 180, 361마리로 무처리구(無處理區) 8,635마리에 비(比)해 각각(各各) 66%, 98%, 98%, 96%의 방제효과가 있었다. 전작물(前作物)인 상치는 P.lilacinus, Telone II, TeloneC-17, Dowfume MC-II구(區)에서 각각(各各) 49, 43, 31, 109% 증수(增穗)되었다. 고추의 생체중(生體重)과 초장(草長)은 훈증제(燻蒸劑) 처리구(處理區)에서는 모두 높게 나타났으나 P. liacinus처리구(處理區)는 무처리구(無處理區)에 비(比)하여 차이(差異)가 없었다.

• Journal of Forest and Environmental Science
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• 제33권1호
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• pp.74-77
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• 2017

The purpose of this study is to analyze the effect of thinning intensity on the growth of large diameter trees in Korean white pine (Pinus koraiensis S. et Z.) plantation. Eight thinning plots were analyzed by categorizing into heavy thinning, light thinning, no thinning (control) according to thinning intensity. As a result, average DBH increased more in heavy thinning plots than in light thinning or unthinned plots. The number of large trees (DBH>25 cm) were obviously shown the most in heavy thinning plots. It is considered that heavy thinning is needed for the production of the large diameter trees.

• 한국농공학회논문집
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• 제53권4호
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• pp.49-57
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• 2011

The objective of this study was to experimentally investigate the feasibility of SRI (system of rice intensification) in Korean rice farming. Eight experimental plots of $5{\times}15$ m in size were prepared on an existing rice field of loam soil. Spacing was $30{\times}15$ cm (conventional treatment: CT), $30{\times}30$ cm, $40{\times}40$ cm and $50{\times}50$ cm, respectively. CT were flooded and SRI plots irrigated intermittently 3 to 5 day interval during cultivation. Organic matter content and pH of the soil were $2.5{\pm}0.03$ % and $6.1{\times}0.2$, respectively, before the cultivation. The highest number of tillers and height of the plant were measured at $50{\times}50$ cm plots. The height and number of tillers and height in $50{\times}50$ cm plots were 10 cm and 1.5 times more than CT. Average irrigation supply to SRI and CT was 243.2 mm and 547.3 mm, respectively. It meant that the reduction of irrigation water in SRI plots over CT was estimated to 55.6 %. Therefore SRI was concluded to have a good enough possibility to be applied in South Korea because it was proven to be more effective in reduction of irrigation water and crop cultivation compare to the CT.

• Journal of Forest and Environmental Science
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• 제33권2호
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• pp.136-146
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• 2017

We selected 6 plots ($100m^2$) located 2.2-3.8 km from Minamidake Crater on the north flank of Sakurajima Volcano. We conducted a field study to investigate the effects of volcanic activity on vegetation succession and surface erosion rate. The results showed that trees growing in plots further from the crater had a greater diameter at breast height (DBH), total height, and age. In addition, these plots had a greater number of woody plants and species, as well as a greater total cross-sectional area at breast height. The Fisher-Williams index of diversity (${\alpha}$) and the proportion of evergreen broad-leaved trees were higher in plots located further from the crater. Vegetation succession in these plots was not at the level of a climax forest. From 1972 to 2015, the timing for active volcano, the depth of volcanic ash layer, the dry density, and the pH of ground surface were lower for plots located further from the crater. Furthermore, the average annual sheet erosion from 1972 to 2015 was also lower for plots located further away from the crater. Overall, plots further away from the crater have a better environment for vegetation growth and a lower dry density of the volcanic ash surface layer. It is thought that lower dry density results in increased soil permeability, which impedes surface flow. In order to prevent debris-flow disasters, caused by mud and rock flow resulting from impaired soil penetrability, it is essential to promote soil development and restore penetrability by artificial vegetation restoration.

• Journal of Plant Biology
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• 제22권1_2호
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• pp.21-27
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• 1979

Sandy loam plots of pH 5.5, which was created by the reclamation of highlands in Yongin county, Kyeonggi province, was selected for the present experimental study. Sugar beet was cultured in these plots by treating them with calcium hydroxide and 3 replications to maintain pH 5.5, 6.4, 6.8, 7.2, and 7.6, respectively. The growth and yield of sugar beet were investigated and the results obtained showed a great deal of boron deficiency. The growth in its early stage was favorable in high pH plots, while no significant difference was observed in sugar content, root weight and sugar production at the time of harvest in each treated plot. The tendency of sugar accumulation appeared to be identical in terms of pattern in each treated plot; i.e. sugar was accumulated until early September but declined momentarily from the middle of September and then the sugar accumulation was resumed from the middle of October. The number of individuals in boron deficiency was larger in high pH plots and the condition of such boron deficiency was also severe. The result of analysis of boron contained in plant body revealed that the boron content of individuals caused boron deficiency by water culture and that occurred in the plots was small alike. The appearance of boron deficiency is characterized by the emergence of black stripes on the surface of the basal part of petiole, severe necrosis of young leaves in the area of growing point and severe wrinkles. Therefore it is felt necessary to pay particular attention to boron deficiency in the culture of sugar beet in our country.

• 한국유기농업학회지
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• 제11권4호
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• pp.93-102
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• 2003

This research was made to determine the optimum mixing ratio cattle manure and food waste investigating the effect that gets the growth and reproductive efficiency of earthworm and productivity of earthworm casts at processing process when handled cattle manure and food waste by vermicomposting, in order to establish the treatment system of organic wastes by vermicomposting. Survival ratio of earthworm was highest in the mixing ratio 80~100% : 20~0% of cattle manure and food Waste, and the increasing ratio was highest in cattle manure 100%, and the number of young worms, the weight of young worms and the productivity of earthworm casts in plots more than the mixing ratio 60% of cattle manure were significantly higher than in the other treatment plots(p<0.05). Total nitrogen and carbon contents in earthworm cast were decreased when rearing time of earthworm was increased. Carbon and nitrogen rate(C/N) of earthworm cast in plots more than the mixing ratio 80% of cattle manure was significantly higher than in the other treatment plots(p<0.05). pH in earthworm cast was higher than that in residual matter. The contents of electrolytic conductivity in the higher mixing ratio of food waste were significantly higher than those in the other treatment plots(p<0.05).

• 한국유기농업학회지
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• 제19권spc호
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• pp.182-185
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• 2011

Soil $NH_4$-N content became higher in proportion to the increase in the urea application rate, while in livestock faeces compost (LFC) plots, it became lower than in urea plots and had no significant difference statistically among LFC plots. There was a close relationship between phosphate fertilization rate and the increment of soil available phosphate content after experiment resulting y=0.1788x-6.169 ($R^2=0.9425$) when applied fused superphosphate fertilizer, and y=0.0662x-2.689 ($R^2=0.9315$) when applied LFCs by the same amounts of phosphate (x: phosphate application, kg $ha^{-1}$, y: increment in soil available phosphate content, mg $kg^{-1}$. Plant height, number of stems, nutrients uptake by rice and rice yield showed higher levels in N 100, 150% application plots of chemical fertilizers, while every LFC plots exhibited lower values and no significant difference among them. Relative nitrogen fertilization efficiencies of LFCs compared to urea was 12.3% for cattle faeces compost (CaFC), 8.8 for swine faeces compost (SwFC) and 24.6 for chicken faeces compost (ChFC), respectively.

• 한국응용곤충학회지
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• 제47권4호
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• pp.395-400
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• 2008

시설재배 가지에서 점박이응애 경제적 피해수준과 요방제수준을 추정하였다. 가지 생육초기 점박이응애 접종밀도(성충 0, 2, 5, 10, 20마리/주)에 따른 시기별 발생밀도는 무접종구를 제외하고 6월7일 접종 이후 점점 증가하다가 7월 5일 이후 급격히 증가하여 7월 중순 발생 피크를 보이고, 이후 서서히 감소하는 경향이었다. 생육최성기 가지 접종수준별 지상부 생육은 처리 간에 큰 차이가 없었고, 과실생육은 과중이 무접종구에 비하여 접종밀도가 높을수록 가벼워지는 경향이었다. 총과수 및 상품과수와 상품과율 및 수량은 접종밀도가 높을수록 감소하는 경향이었고, 그에 따른 수량감소율은 무접종구에 비하여 각각 3.9, 11.3, 14.5, 22.8%로 접종밀도가 높을수록 증가하였다. 점박이응애 접종밀도(X)와 수량감소율(Y)과의 관계는 Y = 1.085X + 2.474 ($R^2$ = 0.9659)의 회귀식을 얻을 수 있었고, 높은 상관관계가 있는 것으로 나타났으며, 관계식에 근거하여 GT값이 전체수량의 5%되는 수량감소율을 추정해 보았을 때 요방제수준은 주당 1.8마리로 추정되었다.

• 한국환경농학회지
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• 제20권2호
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• pp.86-92
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• 2001

벼논 오리농법에 있어서 오리 방사체계를 명확히 하기 위해 각 처리구를 4 a의 동일면적으로 구분하고, 방사 오리수를 각각 6수, 9수, 12수 및 15수씩으로 하는 4처리구를 설계하여 방사밀도에 따른 오리의 행동형 및 벼 생육과 수량반응에 미치는 영향에 대하여 검토하였던 바, 그 결과를 요약하면 다음과 같다. 오리 방사밀도에 따른 일중 12시간 동안의 행동변화에서 섭식 및 이동행동은 12수 방사구에서 가장 길었고, 노동행동에서도 다른 3처리구에 비해 12수 방사구에서 유의적으로 길게 나타났다(P<0.05). 반면 휴식행동은 12수 방사구에 비해 9수 및 15수 방사구에서 현저히 길게 나타났다(P<0.05). 방사오리가 가장 활발한 활동을 보이는 일중 6시간 동안의 이동 회수는 15수 방사구에서 가장 적었고 나머지 3처리구간에서는 거의 비슷한 수준을 보였다. 잠수회수는 9수 방사구에서 다른 3처리구에 비해 유의적으로 많았으며(P<0.01), 벼 포기 쪼는 회수도 9수 방사구에서 12수 및 15수 방사구에 비해 현저히 많았다(P<0.05). 그러나 오리가 쪼은 총 벼포기수에서는 방사밀도가 낮은 6수 및 9수 방사구에 비해 15수 방사구에서 유의적으로 많았다(P<0.01). 벼 초장은 오리 방사후 30일째부터 방사밀도가 높을 수록 짧아지는 경향을 보였고(P<0.05), 경수(莖數)는 방사밀도에 의해 대차없었다. 출수후 벼 생육변화에서 간장(稈長)은 방사밀도가 높은 12수 및 15수 방사구에서 짧았고(P<0.05), 수장(穗長)은 오리 방사밀도에 의해 대차없었다. 벼 지상부의 건물중량은 방사밀도가 높을 수록 낮은 값에 편중됨을 보인 반면, 지하부의 건물중량은 증가하는 경향을 나타냈다. 오리 방사밀도에 따른 벼 결주발생수은 15수 방사구에서 가장 많았고, 다음으로 6수, 9수 및 12수의 순으로 나타났다. 한편 수당(穗當) 영화수는 6수 및 9수 방사구에 비해 12수 및 15수 방사구에서 유의적으로 많았고(P<0.05), 등숙율은 다른 3처리구에 비해 15수 방사구에서 낮은 경향을 보였다. 10 a당 수량은 12수 방사구에서 726.5 kg으로 가장 높은 수량증가를 보였고, 다음으로 9수, 15수 및 6수 방사구의 순으로 나타났다.

• 한국환경복원기술학회지
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• 제19권6호
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• pp.111-121
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• 2016

This study was carried out to assess the riparian vegetation health in the fluctuation area and vicinity of reservoirs. The results of this study could be a basic data to improve the ecological function and establish green-network of waterside ecosystem. The study site is Daecheong lake reservoirs which the representative landscape of Geum river and with great number of visitors near metropolitan city. The 6 survey plots of 2 survey area were selected, survey area 1 had 4 survey plots and survey area 2 had 2 survey plots, and to compare the study results 4 control plots were selected in Gyeongcheon reservoir. The main dominant specie of survey sites was Salix koreensis in tree and subtree layer, were Salix koreensis and Salix glandulosa. in shrub layer. 2 survey plots of Samjeongdong and Kyeongcheon reservoir were assessed as 'Good', 2 survey plots of chudong were assessed as 'Fair' in vegetation health assessment. In the fluctuation area from flood water level to low water level, 58 populations of Salix koreensis were found in survey sites and Salix koreensis, Salix glandulosa and Acer tataricum subsp. ginale were found in control sites. The most adequate species at the condition affected by inundation impacts would be Salix koreensis and Salix glandulosa was more healthy at the area less affected by inundation. This study was carried out the vegetation health assessment on Daecheong reservoir which has been advanced natural succession for more than 30 years after the construction. Further, it should carry continuously out the research on the planting model of the waterside ecosystem for ecological restoration.