• 원예과학기술지
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• 제19권1호
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• pp.92-97
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• 2001

본 실험은 대량생산을 위한 포트 재배시 바실의 생육과 정유함량을 향상시킬 수 있는 최적의 배지와 적정 배양액의 농도를 선발하고자 실시하였다. 배양액농도에 따른 생육은 1, 2배에서 양호하였으며, 3배의 경우 생육이 억제 되었다. 생육이 좋은 양액농도는 펄라이트의 경우 2배, 피트모스. 코코피트 단용배지는 0.5배, 혼용배지의 경우 1배였다. 배지별로는 코코피트를 사용한 경우가 생육이 좋았으며, 펄라이트의 경우도 양호하였으나, 피트모스의 경우 생육이 저조하였다. 내적인 품질은 동일한 경향을 보이지 않았으나, 정유함량의 경우 코코피트와 펄라이트(1:1 v:v)를 혼용한 처리구에서 높은 수치를 보였다. 따라서, 바실 포트 재배의 경우, 코코피트와 펄라이트 1:1(v:v) 혼용배지에 벨기에의 유럽채소연구회에서 개발한 허브 배양액 1배($EC=2.4dS{\cdot}m^{-1}$)를 처리한 것이 외관생육과 정유함량의 두 요소를 고려해 볼 때 가장 적합하였다.

• Journal of Plant Biology
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• 제26권1호
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• pp.17-32
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• 1983

The aboveground production, nutrient distribution and nutrient cyclings were compared between two Phragmites communis communities growing in the different salt contents of soil in a coastal salt marsh. Inorganic nutrient contents of soil for plant growth were greater at the low salt stand than at the high salt stand except for sodium(Na). Maximum aboveground biomass of the plant at the low and the high salt stands were 2,533 and 1,719 g dw/$m^2$, respectively, in August. Seasonal changes of nutrient content of biomass in dry weight decreased with growth except for Na. Nutrient contents in biomass per unit land area increased continuously as biomass increases, although the amount of potassium(K) reached the maximum content in July and thereafter decreased. Vertical distributions of total nitrogen(T-N) and phosphorus(P) increased with plant height, but Na showed the reverse trend. That of K was similar to the patterns for T-N and P in the leaves, and to the pattern of Na in the stems. The Na was greatly accumulated in underground biomass but transported scarcely to aboveground. At the low and the high salt stands, the ratios of the inorganic nutrients contained in the plant were 100 : 66 for T-N, 100 : 61 for P, 100 : 62 for K and 100 : 97 for Na. the ratios of the amounts of nutrients retrieved to soil were 100 : 242 for T-N, 100 : 408 for P, 100 : 127 for K and 100 : 269 for Na, respectively. Turnover times of the T-N, P, K and Na in the communities were 56, 1, 15 and 174 years at the low salt stand, and 75, 2, 24 and 323 years at the high salt stand, respectively. In nutrient cyclings, all of the nutrients retrieving to soil were less than uptake by plant. Among the nutrient, especially P is expected to be exhausted from soil, sooner or later, because of the harvest by men.

• 한국습지학회지
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• 제7권4호
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• pp.33-42
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• 2005

Wetlands often function as a nutrient sink. It is well known that increased input of nutrient increases the primary productivity but it is not well understood what is the fate of produced biomass in wetland ecosystem. Water and sediment quality, decomposition rate of cellulose, and sediment accumulation rate in 11 montane marshes in northern Sierra Nevada, California were analyzed to trace the effect of nitrogen and phosphorus content in water on nutrient dynamics. Concentrations of ammonium, nitrate, soluble reactive phosphorus (SRP) in water were in the range of 27 to 607, 8 to 73, and 6 to 109 ppb, respectively. Concentrations of ammonium, calcium, magnesium, sodium, and potassium in water were the highest in Markleeville, which has been impacted by animal farming. Nitrate and SRP concentrations in water were the highest in Snow Creek, which has been impacted by human residence and a golf course. Cellulose decomposition rates ranged from 4 to 75 % per 90 days and the highest values were measured in Snow Creek. Concentrations of total carbon, nitrogen, and phosphorus in sediment ranged from 8.0 to 42.8, 0.5 to 3.0, and 0.076 to 0.162 %, respectively. Accumulation rates of carbon, nitrogen, and phosphorus fluctuated between 32.7 to 97.1, 2.4 to 9.0, and 0.08 to $1.14gm^{-2}yr{-1}$, respectively. Accumulation rates of carbon and nitrogen were highest in Markleeville and that of phosphorus was highest in Lake Van Norden. Correlation analysis showed that decay rate is correlated with ammonium, nitrate, and SRP in water. There was no correlation between element content in sediment and water quality. Nitrogen accumulation rate was correlated with ammonium in water. These results showed that element accumulation rates in montane wetland ecosystems are determined by decomposition rate rather than nutrient input. This study stresses a need for eco-physiological researches on the response of microbial community to increased nutrient input and environmental change because the microbial community is responsible for the decomposition process.

• 생물환경조절학회지
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• 제6권4호
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• pp.264-269
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• 1997

본 실험은 고기능성 채소 생산을 위한 배양액내의 적정 셀레니움 농도를 구명하고자 수행되었다. 벨기에의 채소연구소에서 허브재배를 위해 개발된 양액을 이용하여 각각 $Na_2$SeO$_4$를 0, 2, 4, 6, 8mg/$\ell$농도로 처리하였다. 배양액내 셀레니움의 농도가 국화과 식물인 향쑥의 생육에 미치는 영향을 알아본 결과 저농도의 처리는 생육을 향상시켰으나 6mg/$\ell$이상의 고농도 처리는 생육을 감소시켰다. 엽록소의 함량은 셀레니움 처리에 의해 증가되었는데 배양액 내의 selenate ion 농도가 높을수록 전체 엽록소함량도 증가되었다. 비타민 C의 함량은 좋은 생장을 보였던 4mg/$\ell$처리까지는 증가하였으나 그 이상으로 농도가 증가했을 때 비타민C의 함량은 감소하였다. 저농도의 selenate 이온 농도는 정유의 함량을 증가시켰으나 고농도에서는 정유의 함량이 감소되었다. 식물에 의한 셀레니움의 흡수는 배양액내의 selenate 이온 농도가 증가할수록 촉진되었다.

• 자연과학논문집
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• 제13권1호
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• pp.83-96
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• 2003

Effect of Nutrient Concentrations, fertigation frequency, and learching percentage on crop growth and nutrient concentrations in root media were evaluated. The treatment of each irrigation with $50 mg.L^{-1}$ of nitrogen in stage 2 and increase to $80 mg.L^{-1}$ nitrogen in stage 3 had the highest crop growth at 34 days after sowing among treatments tested. Feeding with low nutrient concentrations and elevated frequency decreased crop growth. In treatments of each leaching percentage, feeding with low nutrient concentrations and elevated frequency resulted in increased tissue nutrient contents. The less tissue potassium content and higher calcium and magnesium contents were observed in treatment of 50% leach than those in 0% leach. All treatment tested had soil solution pH higher than 6.8. Electrical conductivity in treatments of 50% leach were lower than those of 0% leach. Feeding with low nutrient concentrations and elevated feeding frequency in each leaching percentage resulted in increased electrical conductivity in soil solution of root media. Trends of medium nutrient concentrations were similar to those of electrical conductivity.

• 환경영향평가
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• 제7권2호
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• pp.5-14
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• 1998

This study was performed to estimate interrelation between characteristics of sediment and nutrient releare from sediment in Dae-cheong lake. For the investigations, sediments were sampled in June and October 1997 at fish farms, embayment, and the main stream of Dae-cheong lake. Items for investigation are as follows; water content, weight loss on ignition(IG), porosity of sediment, Total Kjeldahl Nitrogen(TKN), content of element(H, N, C), nutrient release rate. Water content and porosity were measured to conjecture the physical trait and grain size. And weight loss on ignition was measured to determine the contents of organic substance. For the determination of nutrient release rate, $PO_4-P$ and $NH_4-N$ concentration of interstitial water and overlying water were measured. Release rate of nutrients which has direct influenced upon the water quality were 0.05-8.63mg-$P/m^2{\cdot}day$ and 4.99-36.56mg-$N/m^2{\cdot}day$. And it was found that release rate was measured higher in the 1st sampling than in the 2nd sampling. And for determination of the humus level of sediment, carbon and nitrogen content were measured by using elemental analyzer. Generally, C/N ratio is used to determine humus level of lake sediment. As a result of elemental analysis, C/N ratio was determined in the range of 7.64~11.55, so humus level of Dae-cheong lake sediment was estimated from mesohumic state to oligohumic state.

• 생물환경조절학회지
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• 제17권4호
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• pp.252-260
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• 2008

본 실험은 장미 식물공장에서 single-node cutting 'Versillia'의 양분흡수 특성을 구명하고 순환식 수경재배 시스템에 적합한 배양액 내 무기이온 조절방식을 구명하고자 수행하였다. 실험 기간동안 각 처리별 배양액 내 무기이온함량 변화를 살펴본 결과 EC 제어구의 경우 $NO_3$-N은 생육 후반이 되면 그 함량이 적정 범위 이상으로 증가 하였고 P와 Mg은 감소하였으며 배양액 첨가구는 전체적인 배양액 내 무기이온 함량이 증가하였다. 이에 비해 무기이온 제어구는 생육 기간동안 근권 내 적정 범위를 유지하였다. 광합성 효율을 나타내는 지표 중 하나인 Fv/Fm는 무기이온제어구와 배양액 첨가구에서 높았고 절화장, 생체중 등은 무기이온 제어구에서 높았다. 그러나 뿌리의 활성 정도를 측정해본 결과 무기이온 제어구에서 높았으나 배양액 첨 가구에서는 생육 초기에 배양액 내 pH 변화폭이 커서 가장 낮게 나타났다. 위의 결과를 종합하였을 때, 무기이온 조절(다량 미량원소 제어구와 다량원소 제어구)을 통해 배양액을 관리하는 것이 생육 전 기간 동안 근권 환경을 적절히 유지해 줄 수 있었고 이에 따라 절화 품질도 향상되므로 장미(single-node cutting) 순환식 수경재배에 적합한 근권 환경 제어방식이라고 할 수 있다.

• 한국작물학회지
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• 제34권s02호
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• pp.1-12
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• 1989

The primary countermeasure for environmental stresses of crops grown in Korea would be to maintain top soil content of available B for upland crops and Si for low land rice in balance with other nutrient elements such as N, P and K, so as to maintain those nutrient balances in plants. Development of standard levels of elements in soils for balances uptake of those elements by plants are needed under the multi nutrient factor balance concept using the soil test results.

• Journal of Plant Biotechnology
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• 제48권2호
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• pp.77-85
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• 2021

수경재배는 토양 없이 물로만 재배 가능하며 날씨의 영향을 받지 않아 기존에 토양을 이용해 재배하는 것에 비해 많은 이점을 지니고 있다. 여기에 물 대신 배양액을 추가한다면 생육을 더욱 앞당길 수 있다. 본 연구는 배양액과 인공광 처리에 따른 새싹보리의 성장과 이화학적 특성을 조사하였다. 먼저 배양 기간이 지남에 따라 식물체의 길이는 커졌으며 LED 처리구의 배양액 투입구에서 생장이 빨랐다. 생체량 및 건조량은 형광등 처리구가 LED 처리구보다 더 무거웠다. 새싹보리 분말의 색상은 약간의 차이를 보였으며, L값은 50.79~53.77, a 값은 -6.70 ~ -4.42, b 값은 13.35 ~ 14.76이었으며 L값과 b 값은 LED 처리구가 높았으나 a 값은 형광등 처리구가 상대적으로 높았다. 총페놀 함량은 두 처리구에서 대조구가 배양액 투입구보다 높았으나, 총플라보노이드 함량은 총페놀과는 반대 현상을 보였다. TEAC의 경우 대조구의 항산화능력이 배양액 투입구보다 높았으며 FRAP의 경우 형광등 처리구가 LED 처리구보다 높은 함량을 나타내었다. 총 구성아미노산 함량은 106.82 ~ 122.63 mg/g dry powder였으며, 필수아미노산 함량은 47.01 ~ 56.19 mg/g dry powder였고 비필수아미노산은 67.86 ~ 77.66 mg/g dry powder 범위였다. 구성아미노산 중 가장 많이 검출된 것은 Asp이며, Glu, Ala, Leu, Val 순으로 나타났다.

• Journal of Forest and Environmental Science
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• 제29권1호
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• pp.38-48
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• 2013

Decomposition of plant material is an important component in the study of forest ecosystem because of its critical role in nutrient cycling. Different tree species has different nutrient release patterns, which are related to leaf litter quantitative traits and seasonal environmental factors. The quantitative traits of leaf litter are important predictors of decomposition and decomposition rates increase with greater nutrient availability in the forest ecosystems. At the ecosystem level, litter quantitative traits are most often related to the physical and chemical characteristics of the litter, for example, leaf toughness and leaf mass per unit area, and lignin content tannin and total phenolics. Thus, the analysis of litter quantitative traits and decomposition are highly important for the understanding of nutrient cycling in forest ecosystems. By studying the role of litter quantitative traits on decomposition and nutrient cycling in forest ecosystems will provide a valuable insight to how quantitative traits influence ecosystem nutrient dynamics. Such knowledge will contribute to future forest management and conservation practices.