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Myeong Hwan Jang,Jin Kook Choi,Duk Jong Ahn,Yang Ae Choi,Do Yeon Won,Ji Yun Jung,Tae Ryong Kwon 한국약용작물학회 2016 한국약용작물학술대회 발표집 Vol.2016 No.05
Background : Ginseng farmers prefer first planted field because of replant failure. But the accumulation of nutrients is higher in the first planted field due to using large amounts of chemical fertilizers and manure. The higher phosphate concentration in preparation field decreased emergence ratio and occurred leaf chlorosis in ginseng. The purpose of this study was to develop a technology for reducing phosphate concentration in preparation field of ginseng. Methods and Results : This study was performed in farm's fild located Yeongju in 2015. Treatment of plots consisted of sudangrass, maize, deep plowing + sudangrass and microbes(Rhodobacter sphaeroides, Bacillus subtilis, streptomyces griseus) + sudangrass. sudangrass and maize were sown in early May to 5kg / 10a. Microbes diluted 500 times were treated to drench the soil before sowing crops(400L/10a). The main survey was yield of crop, soil chemical properties, reduction ratio of phosphate and changes in available phosphate. Reduction ratio of phosphate in the plot of maize and Rhodobacter sphaeroides were 27.9% and 24.3%, respectively, which were higher 2∼5% than the control plot. Fresh weight yield was the highest with 11.1ton / 10a in the plot of maize and ratio of dry matter was the highest with 27% in the plot of maize. Conclusion : The phosphate removal ability of maize was better than sudangrass in phosphate accumulation soil. Subsoil reversed using excavators used by some farmers could not mitigate of phosphate and salts concentration in preparation field. The soil that phosphate concentration is more than 1,000mg/kg is required a long-term management.
Myeong Hwan Jang,Jin Kook Choi,Duk Jong Ahn,Tae Ryong Kwon 한국약용작물학회 2016 한국약용작물학술대회 발표집 Vol.2016 No.05
Background : Every year, Damping-off is repeated in the germination time of ginseng on April to May. This study was carried out to find out the cause of damping-off and the optimum eco-friendly product for suppression of damping-off caused by Rhizoctonia solani on Panax ginseng. Methods and Results : Bikona (Bioagent), Lime-Sulfur Mixture, Lime-Bordeux Mixture, NaOcl, and Fludioxonil were tested in farmer's field located in Youngju and Bonghwa, Gyeongbuk. Experimental plots (20m×0.9m) of 4-year-old ginseng fields were artificially infested with 2kg and 3kg in fresh weight of inoculum in Youngju and Bonghwa, respectively. Growth characteristics in all the plots of eco-friendly product were similar and had no difference significantly. Damping-off incidences were 0.8% at the polt of NaOcl in Bonghwa, which showed the lowest in all the plots. Ginseng yield in the plot of NaOcl and Fludioxonil were 1.75 kg and 1.71 kg per 1.62 ㎡, which increased 10∼12% compared to the control plot. Conclusion : Sodium hypochlorite as eco-friendly materials for control of damping-off caused by Rhizoctonia solani in ginseng represented a similar performance with Fludioxonil and seems to be utilized in the farm.