• 한국초지조사료학회지
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• 제11권2호
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• pp.90-96
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• 1991

This experiment was carried out in order to estimate the recovery days of root and stubble to the days after cutting, and contribution of specific stubble weight on the regrowth was examined using the relationships between the dry weight of shoot and yield components, and regrowth parameters by the days after cutting. The varieties examined were Maprima, Manhattan, Tove, Peramo, Caliente, Tempo and P-2 grown under individual plant basis. The results are may be summarized as follows: 1. Dry weight of root and stubble were recovered up to 13.5 and 11 days after cutting, respectively. 2. Dry weight of shoot(regrowth parts+stubble) was affected significantly by the varieties, stages of regrowth and variety x stage of regrowth. 3. The variety with tiller weight type showed higher average productivity of shoot than those of the variety with tiller number type. 4. Absolute growth rate(AGR) of shoot was correlated significantly with regrowth parts, stubble, root and weight of a tiller at the early stage of regrowth(up to 12 days after cutting), and correlated with regrowth parts, stubble, weight of tiller and stubble area at the late stage of regrowth(up to 20 days after cutting). 5. Contribution of specific stubble weight to absolute growth rate of shoot was different between the stages of regrowth. Thus, regrowth parts per specific stubble weight(RP1SSbW) and weight of tiller per specific stubble weight(WT1SSbW) contributed to absolute growth rate of shoot at the early stage of regrowth, and efficiency of specific stubble weight(ESSbW), regrowth parts per specific stubble weight (RPISSbW) and weight of a tiller per specific stubble weight(WT1SSbW) contributed to absolute growth rate of shoot at the late stage of regrowth. 6. Regrowth utilization rate(RUR) was one of the useful regrowth parameter to indicate the regrowth potential of grasses.

• 한국초지조사료학회지
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• 제9권3호
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• pp.153-157
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• 1989

This experiment was carried out to investigate the effects of the first harvesting times and regrowth periods after the fist harvest on grass regrowth, dry matter (DM) yield and botanical composition in pasture mixtures during 1987 and 1988. For the test, a split plot design with 3 replications was treated with 3 different first harvesting times (vegetative, stem elongation and heading stage) and 3 different regrowth periods (20, 30 and 40 days) after first harvest. Although the total DM yield of grasses was decreased slightly with earlier cutting, the regrowth DM yield and the regrowth plant height was increased significantly with earlier cutting (p < 0.05). Also, the 30 days of regrowth periods was contributed greatly to the regrowth and the DM yield. The percentage of legumes Tmainly red clover) in botanical composition was increased with later initial harvest anrl longer regrowth period after first harvest. Based on the results, it is suggested that good grass regrowth and seasonal distribution could be achieved by the earlier harvest at fist and the regrowth period of 30 days after first harvest in spring.

• 한국초지조사료학회지
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• 제21권2호
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• pp.81-88
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• 2001

To investigate C and N metabolisms in response to potassium-deficient stress during regrowth of Italian ryegrass(Lolium multiflorum L.), C and N metabolites were analyzed at day 0 (cutting date), 6, 12 and 24 days after defoliation. K-sufficient (control, +K) and K-absent (-K) nutrition solutions were applied from 7 days before defoliation, and continued for one cycle of 24 days-regrowth period. During 24 days of regrowth dry matter of regrowing shoots and remaining tissues were not significantly different between +K and -K treatment. In remaining stubble, all C compounds in both +K and -K treatment largely decreased (69% to 84% of the initial level) during the first 6 days of regrowth, and then rapidly recovered. The decline of soluble sugars and fructan in roots for the first 6 days much less in the -K medium. Amino acids, soluble and insoluble proteins in stubble also feel down during the first 6 days, thereafter actively replenished in both +K and -K treatment. The decline of nitrate in stubble prolonged to 12 days of regrowth. Initial amounts of all N compounds in roots were significantly lower in the -K medium. Higher accumulation of amino acids and soluble protein in roots in the -K medium was observed after 12 days of regrowth. In regrowing shoots, 3 all carbohydrates increased with a very similar pattern for both treatments. Nitrate was not significantly different between two treatments. Depress of soluble protein accumulation in -K medium was noteworthy after 12 days of regrowth. These results indicated that an active utilization of organic reserves occurred to support regrowth even under K deficient condition with a similar extent with K sufficient condition.

• 대한환경공학회지
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• 제27권3호
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• pp.309-315
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• 2005

본 연구에서는, 탄소원, 질소원 및 인산염 인의 형태별, 농도별 각각 다른 배양조건에 대하여, 세균의 재증식 특성을 기존지표인 BRP(Bacterial regrowth potential)법과 새로운 지표인 세균 재증식속도를 이용하여 비교평가하였다. 기존지표인 BRP법에 의해 평가된 세균재증식능은 유기탄소원의 경우 Glucose를 주입했을 경우가 Acetate 및 Humic acids를 주입했을 경우보다 상대적으로 크게 나타났다. 또한 질소원에 대해서는 $NH_4^+-N$을 주입한 재증식량이 $NO_2^--N$ 및 $NO_3^--N$을 주입한 경우보다 높게 나타났다. 인산염 인의 경우, $10\;{\mu}gP/L $ 이하의 매우 낮은 농도범위에서도 급격한 재증식량의 증가가 나타났다. 새로운 지표로써 세균 재증식속도에 의한 평가에서는 유기탄소원에 대해서, Glucose의 경우($0.005{\sim}0.082\;hr^{-1}$)가 Acetate($0.005{\sim}0.068\;hr^{-1}$) 및 Humic acids($0.005{\sim}0.008\;hr^{-1}$)의 경우보다 높게 나타났으며, 질소원에 대해서도, $NH_4^+-N$의 경우($0.008{\sim}0.072\;hr^{-1}$)가 $NO_2^--N$($0.008{\sim}0.055\;hr^{-1}$) 및 $NO_3^--N$($0.008{\sim}0.059\;hr^{-1}$)보다 높은 재증식속도를 갖는 것으로 나타났다. 새로운 평가지표로써 재증식속도에 의해 평가된 결과는 기존지표에 의한 결과와 동일한 경향을 나타내었으며, 따라서 세균 재증식속도에 의한 재증식능 평가방법은 기존지표의 단점을 개선할 수 있는 대체지표로, 적용성이 높은 것으로 판단되었다.

• 한국초지조사료학회지
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• 제21권2호
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• pp.89-96
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• 2001

Carbohydrate and soluble protein reserves and regrowth characteristics in response to cutting height were investigated over four regrowth cycles of turf-type perennial ryegrass(Lolium perenne L. cv. preludeII). When the plants were at the full-vegetative stage (twelve weeks-old), three sequential defoliations at 3, 6 and 9 cm above the root base were imposed at 2-week intervals. Shoot dry weight in all three treatments continuously decreased with progressing regrowth cycle and the decreasing rate was higher as cutting height was lowered. TNC (total non-structural carbohydrate) in stubble at the end of the fourth regrowth cycle in 3, 6 and 9 cm cutting height decreased by 98%, 82% and 27%, respectively, comparing the initial content. TNC in roots also largely decreased with similar pattern in response to cutting height, whereas the absolute amount was much less compared to stubble. Soluble protein in stubble in 3, 6 and 9 cm cutting height decreased by 98%, 82% and 57%, respectively, at the end of fourth regrowth. A significant correlations between TNC (r=0.906) or protein (r=0.879) at the fourth defoliation and dry weight of regrowing shoots at the end of fourth regrowth were observed. these results indicated that cutting height closely influences the levels of organic reserves available for new growth, and that the levels of reserves might provide a useful tool as a determinant for regrowth dynamics.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1987년도 전기.전자공학 학술대회 논문집(I)
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• pp.532-535
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• 1987

A laser interferometry of very high spatial resolution was built to study the solid phase epitaxial regrowth of furnace-annealed silicon wafers. As boron concentration increases up to $1.0E20/cm^3$, regrowth rate increases, but pre-exponential term and activation energy are decreased.

• 한국초지조사료학회지
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• 제41권2호
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• pp.134-140
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• 2021

본 연구는 IRG의 재생시기 판별과 추비시기를 제시하기 위하여 2019년부터 2021년까지 천안지역에서 수행되었다. 이탈리안 라이그라스(IRG) 재생 시기를 판단하기 위하여 지상부로부터 3 cm 부위를 예취하고 1 cm가 재생되는 시점을 재생시기로 판단하였다. 재생시기는 2020년과 2021년 각각 2월 15일 2월 12일로 나타났다. 시험처리는 4처리로 무비구, 재생기 추비 시용구(IGP), 재생기 기준 10일 이후 추비 시용구(10GP), 재생기 기준 25일 이후 추비 시용구로 하였다. 재생기에서 2월 평균온도가 2020년보다 2021년에서 더 낮아 IRG의 재생 시기가 3일 더 늦었다. 추비시기에 따른 IRG의 평균초장은 IGP 처리구와 10DGP 처리구에서 가장 크게 나타났으나 유의적인 차이는 없었다(p>0.05). 평균 건물생산량은 추비시기가 늦어질수록 건물생산량은 점차적으로 감소 하였으며, 추비를 하지 않은 무비구는 IGP 대비 65.2 % 수준이었다. 평균 CP 함량은 무비구에서 가장 낮았고 추비시기가 늦어질수록 높아지는 경향이었다. 그러나 평균 NDF 함량 및 평균 ADF 함량은 처리간에 유의적인 차이는 나타나지 않았다(p>0.05). 월동 후 이탈리안 라이그라스의 재생기에 추비를 하는 것이 건물생산량이 높았으며, 추비시기가 늦어짐에 따라 건물생산량이 감소하는 경향을 나타내었다. 추비시기에 따라 이탈리안 라이그라스의 생산량이 영향을 받는 것을 확인 할 수 있었으며, 기후변화에 대응하는 추비시기 설정에 대한 연구가 필요할 것으로 사료된다.

• 한국작물학회지
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• 제46권4호
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• pp.272-278
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• 2001

To investigate of C and N metabolisms in response to phosphorus-deficient stress during regrowth of Italian ryegrass (Lolium multiflorum L.), C and N metabolites were analyzed at 0, 6, 12 and 24 days after defoliation. P-sufficient (control, +P) and P-absent (-P) nutrient solutions were applied from 7 days before defoliation, and continued for one cycle of 24 day-regrowth period. During 24 days of regrowth, dry matter of regrowing shoots and remaining tissues were not significantly different between +P and -P treatment. In remaining stubble, 70% to 91 % decline of the initial level (at day 0) in all C compounds occurred during the first 6 days of regrowth. Initial amounts of nitrate and amino acids in roots were significantly higher in the +P medium. Nitrate contents in stubble in the +P medium significantly decreased for the first 12 days and then rapidly recovered, while that of the -P medium continuously decreased until day 24. Amino acids in stubble in the P medium were continuously increased during the whole regrowth period. Soluble proteins in stubble in the +P medium also largely fell down (46.0% of the initial) for only the first 6 days, however the decline in the -P medium continued until day 12. In regrowing shoots, the accumulation of C compounds was significantly higher, while that of N compounds except amino acids was largely lower in the -P medium. These results showed a stimulation of carbohydrate synthesis and a compensatory utilization of organic reserves occurred to support regrowth under P-deficient condition.

• 한국초지조사료학회지
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• 제9권2호
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• pp.77-81
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• 1989

This experiment was conducted to elucidate the changes of dry matter production in permanent pasture and its relation with relative yield of the 1st cutting, regrowth capacity, and persistance of orchardgrass sward, based on the data of preceeding The results were summarized as follows; 1. Relationship between relative yield of the 1st cutting and regrowth capacity were changed by the times of established pasture. Thus, the relative yield of the 1st cutting have negative significant correlation (P < -0.001) with regrowth capacity. 2. Regrowth capacity(RC) was positively significant correlations with the dry weight of plant (DW/pl.), number of tillers per plant (NT/pl.), plant size(PS) and distance between adjacent plants (DIS) of the 1st cutting. Also, regrowth capacity(RC) was positively correlations with the dry weight of plant (DW/pl.), number of tillers per plant (NT/pl.), stubble diameter(DIA), stubble area(SB), plant size(PS) and distance between adjacent plants(D1S) of the 2nd cutting. 3. The coefficients of regression of the 1st cutting showed a tendency to slightly decrease, on the other hand, the 2nd cutting and total yield were tended to increase by the times of established pasture. 4, Between the regrowth capacity and persistency were may deeply concerned to the changes of dry matter production in permanent pasture. 5. The process of dry matter production in permanent pasture can be shown in following diagrams.

• 한국조경학회지
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• 제31권4호
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• pp.82-89
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• 2003

This study was carried out to find the suitable root-ball size for the planting construction of landscape trees. Surveyed trees for this study were Cercidiphyllum japonicum and Prunus yedoensis, and the root-ball size was classified into 3D, 4D, 5D, and 6D(D meaning the diameter at the base of a tree). Visual ratings on a scale of 1 to 9 were used as a means for measuring the regrowth strength after planting tested trees. Test trees with 3, 4, 5 and 6D root-ball size were planted on March. 16, 2002 and visual ratings were measured up to April. 30, 2003. Cercidiphyllum japonicum and Prunus yedoensis started showing a difference in regrowth by each rootball size a month after planting. The regrowth quality of Cercidiphyllum japonicum was low at 3D, medium at 4∼5D and high at 6D root-ball size, while the regrowth quality of Prunus yedoensis was low at 3∼4D and medium-high at 5∼6D root-ball size. According to the above results, a root-ball size for good regrowth quality was a little bit different between Cercidiphyllum japonicum and Prunus yedoensis. 4D of Cercidiphyllum japonicum and 5D of Prunus yedoensis could be guidelines for root-ball diameters at the base of trees when planting. However, we concluded that 4D∼5D root-ball is the optimum guideline for regrowth when adapting this guideline to all landscape trees with 8∼l0cm diameter at the base.