• Research in Plant Disease
• /
• v.12 no.3
• /
• pp.278-283
• /
• 2006

The effect of calcium cyanamide($CaCN_2$) on suppression of clubroot of Chinese cabbage was evaluated in the fields infested with Plasmodiophora brassicae at National Institute of Highland Agriculture, Pyeongchang, Korea, from 2002 to 2003. Calcium cyanamide was found to be more effective in reducing disease severity than flusulfamide dust powder. The optimal dosage of calcium cyanamide for control of clubroot of Chinese cabbage was 61 kg/10a. When calcium cyanamide was incorporated into soil at 5, 10, 15 and 20 days before planting(DBP), maximum disease suppression was obtained in the plot with calcium cyanamide, applied 5DBP. The fertilizer property of calcium cyanamide as a nitrogen fertilizer was also investigated by comparing with urea on cv. CR Gangta, a resistant variety of Chinese cabbage. The nitrogen uptake in calcium cyanamide treatment(17.6 kg/10a), was not significantly different from that of urea(17.8 kg/10a). These results indicated that calcium cyanamide could be used as a soil disinfectant as well as a nitrogen fertilizer.

• Journal of Ginseng Research
• /
• v.33 no.2
• /
• pp.139-142
• /
• 2009

The effect of calcium cyanamide (China-made) soil fumigation on the growth of the ginseng pathogen Rhizoctonia, Pythium), soil microbes, and seed germination of lettuce and radish was investigated. At twice the recommended level (2S0-ppm $CaCN_2$), the growth of Rhizoctonia and Pythium, and the seed germination, were not inhibited. Rather, the effective level was 10,000 ppm. The powder form was more effective than the granular form in inhibiting pathogen growth and seed germination. The lettuce seed was also more sensitive than the radish seed. Calcium cyanamide appearedto decrease the fungi population and to increase Actinomycetes in the soil.

• Bulletin of the Korean Chemical Society
• /
• v.28 no.9
• /
• pp.1485-1488
• /
• 2007

Photodissociation dynamics of cyanamide (NH2CN) at 212 nm has been investigated by measuring rotationally resolved laser induced fluorescence spectra of CN fragments exclusively produced in the ground electronic state. From the spectra, rotational population distributions of CN as well as translational energy releases in the products were obtained. The measured average rotational energies of CN were 12.4 ± 0.5 and 11.6 ± 0.5 kJ/ mol for v'' = 0 and v'' = 1, respectively and the center of mass average translational energy release among products was 41.8 ± 6.4 kJ/mol. The observed energy partitioning was well represented by statistical prior calculations, from which it was suggested that the dissociation takes place on the ground electronic surface after rapid internal conversion.

• Journal of the Korean Society of Clothing and Textiles
• /
• v.22 no.7
• /
• pp.911-919
• /
• 1998

부탄테트라카르복실 산을 이용한 면직물의 DP 가공에서 가장 효과적인 촉매로 알려진 sodium hypophosphite(SHP)를 대체하기 위하여 carbodiimide 촉매의 효과를 알아보았다. Carbo야-imide 촉매로는 cyanamide(CY), dicyandiamide(DCY)와 disodium cyanamide(DSC)를 사용하였다. DCY와 DSC가 일반적으로 CY보다 좋은 방추도와 방축도 등을 보였고 또한 독성이 낮고 저장시 안정도 등이 우수하므로 산업적인 응용이 가능하다. 필요한 방추도와 물리적성질의 균형을 위해서 가공욕의 pH 조절이 가장 중요한 인자로 나타났다. 촉매존재시에 면과 부탄테트라카르복실산의 에스터화 가교 반응 메커니즘을 제아하였다. 또한 황화 염료로 염색된 염색포에 대한 가공 효과 분석시 carbodiimide 촉매가 SHP 보다 대체로 작은 색상 변화를 유발시켰다. 이러한 연구 결과는 부양화와 여러 염료의 색상 변화를 유발시키는 SHP를 사용하지 않고 부탄테트라카르복실 산과 carbodiimide 촉매를 이용한 무포름알데히드, 무인 가공제의 면직물 DP 가공의 가능성을 보여 주고 있다.

• Archives of Pharmacal Research
• /
• v.18 no.5
• /
• pp.356-360
• /
• 1995

Two new 1-aryl-2-benzylmercapto-4-aryl-1,6-dihydro-1,3,5-triazine-6-thiones hvae been synthesized by known methods (Coerdeler et al., 1967). These triazines on treatment with thiourea as dealkylating agent, in acidic medium afforded the corresponding 1-ary-2-mercapto-4-aryl-1,6-dihydro-1,3,5-triazine-6-thione which on further reaction with different ${\alpha},{\;}{\beta}-unstaturated$ carbonyl compounds and aryl-cyanamide ydrochloride affordered the related adducts. Some of these compounds show appreciable antithyroidal activity.

• Bulletin of the Korean Chemical Society
• /
• v.29 no.9
• /
• pp.1685-1688
• /
• 2008

• Journal of the Korean Chemical Society
• /
• v.42 no.2
• /
• pp.228-231
• /
• 1998

• Research in Plant Disease
• /
• v.17 no.1
• /
• pp.32-37
• /
• 2011

Field experiments were conducted to evaluate the effectiveness of soil solarization at the Nonsan Strawberry Experiment Station, Korea in 2006 and 2008. In in vitro tests, exposure times to achieve an $LD_{100}$ of Fusarium oxysporum f. sp. fragariae were 6.6 days and 5.1 days at $45^{\circ}C$ and $50^{\circ}C$, respectively. A 100% lethal temperature was $46.7{\pm}0.1^{\circ}C$ for the same fungus. For field trials, solarization was conducted during the summer season using polyethylene mulch in a plastic house. The organic matter+calcium cyanamide+solarization treatment increased pH, organic matter, and calcium content compared to those before treatment in soil analysis, but no effect had an urea+solarization treatment. The temperatures at 10 cm depth were different in each treatment and the highest temperature was recorded from July 30 to August 10. The average temperature in organic matter+calcium cyanamide+solarization treatment at 10 cm depth was $3{\sim}4^{\circ}C$ higher than that in all the other treatments. All solarization treatments reduced the soil population of F. oxysporum f. sp. fragariae at 100% in 2008 relative to the non-treated control. All solarization treatments reduced Fusarium wilt incidence to 0% in 2006 and 2008. The effect of organic matter+calcium cyanamide+solarization against F. oxysporum f. sp. fragariae indicates that there may be future alternatives to traditional solarization for disease control as well as reducing the time needed.

• YAKHAK HOEJI
• /
• v.35 no.4
• /
• pp.258-263
• /
• 1991

Seven drivatives of 2, 3-alkyl substituted aziridinecarboximidates were prepared from alkyl substituted alkene and cyanamide. Their ED$_{50}$ values against L$_{1210}$ cell in vitro were evaluated as 1.5 to 4 $\mu\textrm{g}$/ml.

• Journal of Bio-Environment Control
• /
• v.11 no.2
• /
• pp.61-66
• /
• 2002

Double cropping system in a year in Kyoho grapes (Vitis labruscana L.) has currently been attempted in the plastic greenhouse. One of the problems in double cropping system is the promotion of bud break in summer season and shoot fertility. Effects of the control of soil moisture tension near the root zone and treatments of bud dormancy breaking agents on bud breaking in summer were examined to promote the bud break for the second fruiting. The lignification of shoots was induced in July or August by the control of soil moisture tension in root zone environment. The first shoot growth was almost the same as that in common plastic greenhouses. The highest bud break value appeared in the plot of cyanamide chemicals mixed with merit blue as over 75% bud break rate. The bud break rate in the discontinuing plot in irrigation showed significantly higher in bud break than that in the continuing plot in irrigation. Despite of the final high bud break rate, the time of bud break was irregular.