• 한국잡초학회지
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• 제18권3호
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• pp.191-196
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• 1998

벼 무경운재배시 수확 잔재인 볏짚과 비선택성 제초제 처리로 고사한 둑새풀이 논토양을 피복할 때 이들이 잡초 발아 및 벼의 입모와 초기생육에 미치는 영향을 알기 위하여 1998년 Pot실험한 결과를 요약하면 다음과 같다. 1. 볏짚 + 둑새풀 피복구의 입모율은 56.9%로서 볏짚피복구의 79.2%, 무피복구의 80.6%에 비하여 유의하게 낮았다. 2. 볏짚 및 볏짚+둑새풀 고사체 피복은 무경운 직파벼의 초기분얼을 현저히 억제하였다. 그러나 분얼성기 이후에는 생육을 유의하게 증진시켰다. 3. 볏짚단독피복, 볏짚+둑새풀 고사체 피복은 무경운직파재배에서의 잡초발생을 유의하게 감소시켰다. 피의 방제가는 볏짚피복구가 98.5%, 볏짚+둑새풀 고사체피복구에서는 76.1%이었다. 4. 볏짚피복과 볏짚 + 둑새풀 고사체 피복은 담수 후 20일간 수중 pH와 용존산소량을 유의하게 낮추었다. 5. 볏짚 및 볏짚+둑새풀 고사체 피복은 무경운 직파구의 지온을 직파 5일간은 $1^{\circ}C$ 낮추었다가 9일 이후에는 오히려 $1^{\circ}C$ 정도 높였다.

• 한국토양비료학회지
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• 제44권1호
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• pp.91-97
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• 2011

The objectives of this research were to investigate the system of rice intensification (SRI) on early growth, grain yield, and yield components under Chinese milk vetch residue-mulched no-tillage cropping systems at silt loam soil. The field was prepared as a split-plot design with three replications, main plots consisted of Dongjinbyeo, and Sobibyeo as a cultivar, and subplots consisted of $10{\times}10$ cm, $20{\times}20$ cm, and $30{\times}30$ cm as a planting density. Weed infestation during rice growing season was more severe in wider planting density $30{\times}30$ at 35 days after transplanting (DAT), and $20{\times}20$ cm at 95 DAT in both Sobibyeo and Dongjinbyeo. The maximum plant height was recorded in Sobibyeo compared with Dongjinbyeo, $10{\times}10$ cm and $20{\times}20$ cm planting density compared with $30{\times}30$ cm from 20 DAT until 60 DAT. Among the three planting densities, SPAD values were significantly greater in planting density of $20{\times}20$ cm both in Sobibyeo and Dongjinbyeo followed by $30{\times}30$ cm compared with closer planting density of $10{\times}10$ cm. The lowest grain yield was observed in wider planting density of $30{\times}30$ in both Sobibyeo and Dongjinbyeo due to lower number of panicle per unit area. Our findings suggest that optimum planting density for SRI in no-tillage paddy was $20{\times}20$ cm and it should be useful the systems to small-scale rice farmers in Korea as a sustainable farming system.

• 한국잡초학회지
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• 제16권2호
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• pp.100-107
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• 1996

벼 무경운재배시(無耕耘我培時) 가장 효과적인 사마귀풀 방제(防除)를 위해서 담수표면직파(湛水表面直播)와 어린모 이앙재배에서 수종(數種) 제초제(除草劑)를 공시하여 처리한 결과는 다음과 같다. 1. 담수표면지파(湛水表面直播)에서 파종전 사마귀풀의 제초효과(除草效果)은 butachlor, pretilachlor, pretilachlor/pyrazosulfuron, bensulfuron/thiobencarb 처리에 서 7 이상으로 비교적 양호하였으며, 벼 약해(藥害)는 1정도로 경미하였다. 2. 입모수(立毛數)는 무처리의 49개/$m^2$에 비해 공시 제초제 처리에서는 6개/$m^2$ 이상이었다. 3. 파종 후 40일에 방제가(防除價)은 butachlor, pretilachlor, pretilachlor/pyrazosulfuron, bensulfuron/thiobencarb 처리에서는 95% 이상이었으나 pyrazosulfuron/molinate 처리는 23.5%로 매우 낮은 방제가(防除價)을 보였다. 4. 파종후 30일 부터 70일까지 공시제초제처리의 벼 초장은 무처리에 비해 약간 짧은 경향이나 $m^2$당 경수는 월등히 많았으며 백미수량은 무처리에서 63kg/10a였으나 pyrazosulfuron/molinate를 제외한 공시 제초제처리 공히 450kg/10a 이상이었다. 5. LGC40863은 30g ai/ha 수준 이상에서 사마귀풀 엽기에 관계없이 90% 정도, 50g ai/ha 수준 이상에서는 거의 완전 방제(防除)가 가능하였다. 6. 어린모 이앙재배에서 이앙후 15일경에는 LGC40863 30g ai/ha 수준으로 사마귀 풀의 방제(防除)가 가능하였고, 무효분얼기(無效分蘖期) 처리에서도 LGC40863 50g ai/ha 수준이면 2,4-D나 bentazon 보다 월등히 양호하였다.

• The Korean Journal of Ecology
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• 제18권4호
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• pp.471-481
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• 1995

The weed population dynamics as affected by contrasting conventional tillege (CT) and no-tillage (NT) practices with a minimum herbicide application was studied in Athens, Georgia, U.S.A. Common chickweed (Stellaria media) was the most common spring weed while johnsongrass (Sorghum halepense), sicklepod (Cassia obtusifolia), and pigweed (Amaranthus retroflexus) accounted for 89∼97％ of net production during summers of 1983 and 1984. Total weed production in summer of 1984 was 2∼5 times greater than that of 1983. Weed production was greater in NT plots than in CT plots in summer of 1983, but reverse was the case in summer of 1984. In spring, net production in NT plots was greater than that in CT plots, especially, in 1985. Species diversity was consistently higher in NT plots, but in the wet summer of 1984 the pattern was different, with higher diversity in CT plots. Weed species diversity was higher in the spring rye crop than in the summer grain sorghum crop. The larger but less diverse weed populations in summer of 1984 indicated that these populations experienced competitive exclusion. Under the favorable summer moisture conditions the three dominant species grew so vigorously and quickly as to exclude many less common species that were able to survive under the drier conditions in 1983. The three dominant species not only excluded other weeds in 1984 but also greatly reduced crop production. The perennial johnsongrass was equally successful, or even more so, in CT plots as in NT plots. Plowing did not kill johnsongrass rhizomes but tended to break them up, thus increasing the number of individual plants that appear after the plowing. It means that johnsongrass was not controlled by the plowing. In summer of 1983, a moderate amount of weedy growth was maintained with a minimum amount of gerbicide application in NT and CT plots. It is possible that a small mixed weed population would be beneficial by providing cover for predatory and parasitic arthropods, and by reducing soil temperature and moisture losses.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제17권2호
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• pp.137-152
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• 1995

This study was designed to evaluate the bone formation capability of the bone substitute when compared with autogenic bone, freeze-dried demineralized allogeneic bone and bioglass into parietal bone of the rats. We made the parietal bone defects in $7{\times}7mm$ size on rats and has performed the bone graft in each experimental groups. Postoperatively 1, 2, 4, 6, 8, weeks, each specimen stained with H & E, Masson's trichrome methods. We evaluated the osteogensis capability in each groups. The result were as follow : 1. Inflammatory cell infiltration approached at 1 week and disappeared at 4 weeks in all experimental group, expecially severe in freeze-dried demineralized allogeneic bone group. 2. New capillry proliferation was increased in autogeneic bone graft group than any other groups and was increased till 2 weeks and decreased in freeze-dried demineralized allogeneic bone group and was few in bioglass group. 3. Osteoblastic activity increased in autogeneic bone and freeze-dried demineralized allogeneic bone groups till 4 weeks, and decreased in 6 weeks which no difference between these groups. But, few occurred in bioglass group till 6 weeks. 4. Initial osteoclastic activity was prominent in freeze-dried demineralized allogeneic bone group and few in autogeneic bone group. 5. New bone formation bega at 1 week in autograft and freeze-dried demineralized allogenic bone groups, but, mild new bone formation at 8 weeks in bioglass.

• 한국환경과학회지
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• 제22권11호
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• pp.1509-1517
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• 2013

So far, most studies associated with soil carbon sequestration have been focused on long term aspect. However, information regarding soil carbon sequestration in short term aspect is limited. This study was conducted to determine changes of soil organic carbon content and stability of carbon in response to compost application rate and tillage management during rice growing season(150 days) in short term aspect. Under pot experiment condition, compost was mixed with an arable soil at rates corresponding to 0, 6, 12, and 24 Mg/ha. To determine effect of tillage on soil carbon sequestration, till and no-till treatments were set up in soils amended with application rate of 12 Mg/ha. Compost application and tillage management did not significantly affect soil organic carbon(SOC) content in soil at harvest time. Bulk density of soil was not changed significantly with compost application and tillage management. These might result from short duration of experiment. While hot water extractable organic carbon(HWEOC) content decreased with compost application, humic substances(HS) increased. Below ground biomass of rice increased with application of compost and till operation. From the above results, continuos application of compost and reduce tillage might improve increase in soil organic carbon content and stability of carbon in long term aspect.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제17권4호
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• pp.365-378
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• 1995

Allogeneic bone grafting has recently been used in oral and maxillofacial regions to restore the cosmetic and functional problem. There are several types of allogeneic bone grafts ; bone powder, bone chips, bone blocks. Empirically, it is thought to be better to combine the allogeneic bone chips to any type of tissue adhesive not to displace during packing and condensing. But, there are no reports about using tissue adhesive in allogeneic bone grafting. This experimental study is designed to investigate the effect of the fibrin adhesive on bone healing process after demineralized allogeneic bone grafting in 60 rats. In control groups (30 rats), routine demineralized allogeneic bone grafting were done in 7 ${\times}$ 7mm calvarial bone defects which were drilled intentioally. And we used the fibrin adhesive for holding the bone particle in experimental groups (30 rats). Each experimental specimen was sacrified at 1, 2, 4, 6, 8 weeks postoperatively The results were as follows : 1. The degree of inflammatory cell infiltrations were more prominent in experimental than in control groups till 2 weeks. 2. Early fibroblast proliferation and new capillary proliferation were uncorporated around graft sites in the experimental groups later than in control groups at early stages. 3. Osteoblastic activity in control group was more prominent at 2 weeks. 4. Osteoblastic activity in experimental groups was more prominent than in control group till 4 weeks. 5. New bone formation was more in control group than experimental group till 3 weeks, but similar appearance after that time. As above results, initial bone healing within 2 weeks were more processed in without adhesive group than with adhesive group. But above 4 weeks; similar bone healing were observed.

• 한국작물학회지
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• 제50권spc1호
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• pp.77-84
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• 2005

1) 현미 품위는 무경운 짚 피복 벼 작부체계(SMNTRCS)와 무경운 짚 피복 벼-자운영 작부체계(SMNTRVCS)가 관햄 벼-보리 작부체계(CRBCS)와 관행 벼 작부체계(CRCS)보다 좋은 경향을 나타내었다. 백미 품위는 SMN TRCS에서 가장 우수하였다. 2) Mg와 K의 함량은 SMNTRVCS에서 가장 높았으며 Na 함량과 Mg/K는 CRCS에서 가장 높게 나타났다. 3) 단백질함량은 SMNTRCS에서 가장 높았으며, SMNTRVCS, CRBCS 및 CRCS순으로 감소하였다. 아밀로스함량은 SMNTRVCS에서 다른 작부체계에 비해 높게 나타났다. 4) 알카리붕괴도는 $1.2\%$ KOH농도에서 작부체계별 품종간 변이가 가장크게 나타났다. 모든 KOH농도에서 알카리붕괴도는 CRBCS에서 가장크게 나타났으며, CRCS가 가장 낮았다. 5) 양질미 생산을 위해서는 유기물 투입으로 질소시비량을 줄일 수 있는 작부 체계인 SMNTRCS 및 SMNTRVCS가 가장 유리 할 것으로 사료된다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 1997년도 추계 학술대회지
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• pp.86-87
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• 1997

• 한국작물학회:학술대회논문집
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• 한국작물학회 1997년도 추계 학술대회지
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• pp.108-109
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• 1997