• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1997.05a
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• pp.5-10
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• 1997

본 실험은 온실멜론을 암면재배하여 수분전후 21일간 질소공급제한이 생육, 품질 및 양분흡수에 미치는 영향을 조사하였다 가을과 겨울재배에서는 상당히 고농도의 양분을 흡수하는 시기이기 때문에 시즈오카대 처방(NO$_3$-N = 8me/$\ell$)을 이용하여 재배하고 양분도 제한했기 때문에 식물체는 양분부족 현상을 야기하였다. 교배 후 양분흡수를 제한하는 경우 상위엽의 과잉비대를 방지하였으나 초장과 과실의 생체증은 양분공급을 제한하지 않는 경우에 크게 나타났다. 그 원인은 양분공급을 제한하는 기간 및 시기와 시용배양액 농도 차이에 따른 양분흡수량의 차이라고 생각되었다. 이상으로부터 수분기에는 양분흡수량이 많기 때문에 양분공급을 제한하지 않고 양분공급을 증가시키는 편이 과실의 외관, 품질향상 및 과실의 당도향상에 상당히 기여할 것으로 생각되었다.

• Korean Journal of Soil Science and Fertilizer
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• v.34 no.5
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• pp.358-364
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• 2001

To obtain information for the proper fertilization management of cut-flower roses, the amount of macro and micro elements absorbed by cut-flower roses from soil for a year was investigated. Three cut-flower rose cultivars which are called 'Grandgara', 'Nobless', and 'Centina' were transplanted to a sandy loam soil, N-P-K standard fertilization was applied to the soil, and drip irrigation was done at the level of 10 kPa soil moisture tension. There was not significantly different in the harvest amount of cut-flower rose between 'Grandgara' and 'Nobless', but the harvest yield of 'Centina' was about 63% level when compared to that of 'Grandgara'. Considering seasonal changes in the content of nutrients in plant, parts, the uptake of untrients was higher in winter season than that in spring and summer seasons. Except for 'Centina', the nutrient amount removed from plant parts of 'Grandgara' and 'Nobless' increased with the sequence of floral part < stem < leaf, indicating that it is more dependent on biomass yield than on the content of nutrients in each plant part. The ratio of N/K amount absorbed by 'Nobless' and 'Centina' was 1.13 and 1.28. respectively, lower than 1.68 of 'Grandgara', showing that the requirement for K is greater in 'Nobless' and 'Centina' than in 'Grandgara'. The use efficiency of nutrients by cut-flower roses ranged from 39 to 64% in nitrogen, 5 to 9% in phosphorus, and 37 to 67% in potassium. It suggests that the requirement for P in cut-flower roses is very low.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.46 no.3
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• pp.253-259
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• 2001

The purpose of this study was loused on understanding of uptake of nutrients by plants, the behaviors of nutrients in soil and the possibility of leaching loss when N fertilizer (urea) and mature compost were applied. Lysimeters (volume 0.15㎥, diameter 62cm, height 62.8cm) were installed for collecting leachate in the Jeju volcanic ash soils. Lysimeter study consisted of thirteen treatments: fellow, fellow with weeding, cropping without fertilizer and compost, three N fertilizer soil surface applications (16, 32, and 64 kg/10a), three N fertilizer and compost soil surface applications (16+800i 32+1600, and 64+3200 kg/10a), two water dissolved N fertilizer applications(16 and 32 kg/10a), and low and high plant densities. The growth of corn (preceding crop) and potatoes (succeeding crop) and leaching loss were determined during the experimental period. The amount of leachate from lysimeter was remarkably greater at bare conditions than at cropping conditions for corn and potatoes. The N content of plants (corn and potatoes) tended to increase as fertilizer rate increased. Fertilization of urea dissolved in water to soil was more efficient than surface fertilization for the growth, yield, and the N uptake N of corn and potatoes. There were no differences in dry matter yield of plants between medium and high N rates, but N, Ca, K and Mg concentrations of plants were higher at higher N rates. There were significant correlations between N uptake and each of Ca, K and Mg uptakes in corn and potatoes. Total N uptake by plants increased with increased N fertilizer and compost applications. Plane absorbed 54.9% of applied N at low N rate and 31.0 to 34.0% at high N rates. The proportion of N leaching losses was lower at low N rate and high plant density.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2001.04b
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• pp.77-78
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• 2001

순환식 양액재배에서 근권부 배지의 종류가 작물의 양분흡수에 미치는 영향을 구명하고자 하였다. 배지별 양액흡수량은 토마토 및 오이 모두 같은 경향이었는데, 단위일사량당 양액흡수량을 보면 오이는 생육 전반기인 6월 5일까지 지속적으로 양액흡수가 이루어지다가 일사량에 따라 전체 양액의 흡수가 변화하였다. 그러나 단위일사량당 양액흡수량은 생육 후반기에 일정한 수준을 유지하였는데 이것은 노화된 하엽을 제거하였기 때문으로 보인다(Fig 1). 배지에 따른 양액흡수량은 전체적으로 암면에서 생육 후기까지 다소 높은 경향을 보였으나 통계적으로 유의성은 인정되지 않았다. 또한 배지간의 무기이온 흡수율은 이온별로 차이가 있었으나 모든 이온에서 유의성은 인정되지 않았다. 배지에 따른 무기이온 흡수량은 전체적으로 암면에서 생육 후기까지 다소 높은 경향을 보였으나 통계적으로 유의성은 인정되지 않았다(Fig. 2). 작물의 생육 및 수량에서도 암면에서 전반적으로 높은 경향을 보였으나 통계적으로 유의성을 보이지는 않았으나 오이의 엽중은 암면에서 무거웠고 엽건물중도 차이가 있었다. 기타 생육 요소간에는 유의성이 인정되지 않았지만 암면에서 다소 좋은 경향을 보였다(Table 1). 따라서 작물의 무기이온 흡수량을 추정하는 모델식의 입력요소로 배지 종류는 적합하지 않았으며 다만 수분 보유력이 좋은 암면에서 양액 흡수량이 많았다는 결과를 얻었다.

• 농업기술회보
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• v.48 no.4
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• pp.38-38
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• 2011

벼에 발생하는 거의 모든 병해충은 질소시비량이 많을수록 발생이 심하고 피해도 큰 것으로 보고되고 있으며, 여러 연구자료를 보면 식물이 흡수하는 양분의 질과 병해충과는 서로 관련이 있다고 알려져 있다.

• Korean Journal of Soil Science and Fertilizer
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• v.43 no.5
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• pp.616-623
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• 2010

Plant samples from 49 sites for Chinese cabbage, 28 sites for radish, 16 sites for cabbage, 8 sites for head lettuce, 20 sites for onion from farmers' and experimental fields in highland of Korea were collected and analyzed to find out the uptake patterns of nitrogen (N), phosphorus (P) and potassium (K) by altitude. Dry weight and uptake of N, P and K were increased at higher altitude in most vegetable crops. Nutrition uptake by Chinese cabbage was 163 ~ 283 kg $ha^{-1}$ for N, 42 ~ 69 kg $ha^{-1}$ for $P_2O_5$ and 146 ~ 270 kg $ha^{-1}$ for $K_2O$ according to altitude. Nutrient uptake by radish according to altitude was 153~159 kg $ha^{-1}$ for N, 38 ~ 46 kg $ha^{-1}$ for $P_2O_5$, and 151 ~ 185 kg $ha^{-1}$ for $K_2O$. In case of cabbage, the plant uptakes of N, P, and K were increased at altitudes of 600 ~ 1,000 m. Nutrient uptake of cabbage was 280 ~ 348 kg $ha^{-1}$ for N, 34 ~ 87 kg $ha^{-1}$ for $P_2O_5$, and 209 ~ 290 kg $ha^{-1}$ for $K_2O$ according to altitude. Uptakes of N-$P_2O_5-K_2O$ by head lettuce at an altitude of 800 ~ 850 m were 93-26-126 kg $ha^{-1}$, respectively. Uptakes of N-$P_2O_5-K_2O$ by onions at an altitude of 600 ~ 800 m were 313-140-234 kg $ha^{-1}$, respectively, but there was no tendency in nutrition uptake patterns by altitude. Small cultivation areas used for leaf vegetable crops do not have fertilizer recommendation standards in alpine regions. It might be preferable to use a correction factor equivalent to the index of available nutrient uptake for the determination of N, P and K fertilizer application rates.

• Korean Journal of Soil Science and Fertilizer
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• v.35 no.5
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• pp.280-289
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• 2002

This study was conducted to evaluate the effects of annual application of slowle cooled slag silicate fertilizer on rice yield and soil chemical properties. Field experiment was done on the condition of fertilization of silicate fertilizer 1,500 and $2,500kg\;ha^{-1}$ to the clay loam paddy field during 26 years from 1975 to 2000. The results obtained were as follows; Rice yield of NPK+silicate fertilizer $1,500kg\;ha^{-1}$ and $2,500kg\;ha^{-1}$ were increased by 15%, 8% respectively incomparion with NPK control plot in 2000($26^{th}$ year). Changes in average rice yield for 5 years interval were continually showed increase in the treat of silicate fertilizer $1,500kg\;ha^{-1}$ compared to NPK and NPK+silicate fertilizer $2,500kg\;ha^{-1}$ treated plot. The amounts of N, $K_2O$, CaO and MgO in the treat of silicate fertilizer $1,500kg\;ha^{-1}$ were much more than those of silicate fertilizer 2,500kg treated plot, and the treat of silicate fertilizer $1,500kg\;ha^{-1}$ showed higher in nutrients availability and fertilizers use efficiency than other treated plots at harvesting stage. Amount of N, $P_2O_5$, $K_2O$ and MgO in unhulled rice grain, those of CaO, MgO and $K_2O$ in rice straw and those of $K_2O$ and $SiO_2$ in rice root were positively recognized significant relationships with grain yield. According to soil analysis after experiment in 2000, the silicate fertilizer $2,500kg\;ha^{-1}$ annually applied plot were increased especially in soil organic matter, CEC and available phosphate content in comparison with NPK+silicate fertilizer $2,500kg\;ha^{-1}$ applied plot.

• Korean Journal of Soil Science and Fertilizer
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• v.36 no.4
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• pp.225-232
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• 2003

Nutrients and water absorption by Citrus unshiu Marc. cv. Miyagawa Wase were examined using spray type of out-door hydroponics system. Three different concentration levels of nutrient solution were treated to citrus trees to examine nutrient uptake. To do so, concentration and the volume change of nutrient solution was measured for each treatment. By weighing the volume of solution and citrus trees, amounts of water uptake and fresh weight increase were observed periodically. Water uptake by trees increased as tree grew and time elapsed, but was lower at high level of nutrient concentration than the rest, due partly to the reduction in hydraulic conductance and to the sustained high salt concentration. Rapid increase in fresh weight and nutrient uptake occurred from May to July and from August to September. The amounts of nutrient uptake were significantly different among nutrient levels: the higher concentration, the greater uptake by citrus tree. The absorbed amounts of $NO_3$, K and Ca were much higher than those of $NH_4$, S, P, Mg, and Fe. Most mineral contents in leaves were proportional to the concentration of supplied nutrient solutions. From the results of nutrient absorption and contents in leaves at different levels of nutrient solutions, the composition of major elements for citrus nutrient solution can be modified as follows: 27.1, 16.5, 66.0, 80.0, and $24.0mg\;L^{-1}$ for N, P, K, Ca, and Mg, respectively.

• Korean Journal of Environmental Agriculture
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• v.25 no.2
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• pp.170-173
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• 2006

This study was conducted to analyze the effects of fowl manure application on growth and quality of Ficus benjamiana. The growth of F. benjamiana was the best at the application of 10% fowl manure. The nutrient uptake increased as the dates passed after transplanting. By the elements, the uptake amount was high in order of N>K>Ca>P>Mg. By fowl manure application rates, the nutrient uptake was the highest in 10%. The mot growth characteristics improved in higher fowl manure application rates, and it was the best in 10%.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.41 no.4
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• pp.405-410
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• 1996

To elucidate the pattern of nutrient absorption and endosperm consumption as the seedling age of rice, Dongjinbyeo was raised in the seedling box with different nitrogen levels. Absorption of nitrogen and phosphorus were high in the order of artificial seed bed soil, sand with N-1g /box and sand without N from 3 and 5 days after seeding but, potassium wasn't significantly different between sand＋N-1g /box and sand. Endosperm consumption rate was high in the order of artificial seed bed soil, sand ＋ N-1g /box and sand but, endosperm dependence rate (endosperm consumption /top dry weight) was vice versa. Seedling height and dry weight were higher in the order of artificial seed bed soil, sand+N-1g /box and sand from 3 days after seeding, number of leaves were more from 5 days after seeding in same order.