더덕의 수량증대를 위한 지주재배 방법 및 뿌리혹선충방제 연구

Abstract

In order to investigate effects of stacking installation on yield of Codonopsis lanceolata, different cultivation methods, untreated control(crawling cultivation: conventional creeping cultivation method), stacking cultivation of bell type, and stacking cultivation of crossed bell type, were compared from March through November, 2007. In results, the weight of Codonopsis lanceolata by the untreated control yielded 687 kg per 10a. The marketable rates of products higher than 60 g (high quality) and ranging between 30 g and 60 g (medium quality) were 4.5% and 19%, respectively. In the stacking cultivation of bell type, utilizing an iron cross-stick, the yield was 846 kg per 10a; the marketable rates of high quality(i.e.,> 60g) and medium quality (i.e., > 30g and < 60g) were 8% and 35%, respectively. Lastly, in the stacking cultivation method of crossed bell type, one iron cross-stick was installed as like in the stacking cultivation of bell type and then another iron stick was additionally set up in lengthwise. In the group, the yield was 1,053 kg per 10a with marketable rates of 17% and 37% for high quality and medium quality products, respectively which is dramatic increase(i.e.,56%) in yield compared to that of the untreated control. In order to effectively control damages from root-knot nematode, often shown in Codonopsis lanceolata, various control methods were compared: untreated control(water treated group), typical treatment of farmers, treatment of Lysobacter enzymogenes(i.e., chitin degrading microorganism), and treatment of commercial fungicide Fosthiazate®. Firstly, 300 g of soil sample was collected in advance to employ preventive measures. And, numbers of root-knot nematode were investigated every 30 days after the treatment. In results, there were 2,422 root-knot nematodes in the control (i.e., water treated soil) and these numbers were relatively well maintained throughout the study period; the final numbers of root-knot nematode were 2,138 in the control group. On the other hand, in the typical treatment of farmers, root-knot nematode numbers were reduced by 41% (2,452 to 1,440), whilst it was more dramatic in the treatment of Lysobacter enzymogenes (64% reduction; 2,512 to 912). Although the treatment of commercial fungicide Fosthiazate® reduced the root-knot nematode by 28% (2,470 to 1,779), these effects were less pronounced compared to the other groups, typical treatment of farmers and treatment of Lysobacter enzymogenes.