• Proceedings of the Plant Resources Society of Korea Conference
• /
• 2003.10b
• /
• pp.40-42
• /
• 2003

In order to examine the possibility that oil seed rape could be used as a forage fodder crop and to select the most suitable variety of forage rape at the southern area of Korea, two varieties of oil seed rape currently grown for oil production and six introduced varieties of forage rape with relatively high yield and high nutritional value were grown at the same condition and yield components were observed. Forage rape was superior to oil seed rape in terms of yield components, plant fresh weight and plant dry mater weight. Velox was superior to any other variety of forage rape in these characters. When plant dry matter weight of the rape was subdivided into four components such as a main stem, branch stems, main stem leaves and branch leaves, contribution of these components to plant dry matter weight was in the order of branch stems, branch leaves, the main stem and main stem leaves. Dry matter percentage of the rape ranged from 9.32 to 11.08 percent, which was somewhat low value. There was no significant difference between two groups of the rape in terms of dry matter percentage. Velox showed somewhat higher value in dry matter percentage.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.48 no.5
• /
• pp.376-380
• /
• 2003

In order to examine the possibility that oil seed rape could be used as a forage fodder crop and to select the most suitable variety of forage rape at the southern area of Korea, two varieties of oil seed rape currently grown for oil production and six introduced varieties of forage rape with relatively high yield and high nutritional value were grown at the same condition their and yield components were observed. Forage rape was superior to oil seed rape in terms of yield components, plant fresh weight and plant dry mater weight. Velox was superior to any other variety of forage rape in these characters. When plant dry matter weight of the rape was subdivided into four components such as a main stem, branch stems, main stem leaves and branch leaves, contribution of these components to plant dry matter weight was in the order of branch stems, branch leaves, the main stem and main stem leaves. Dry matter percentage of the rape ranged from 9.32 to 11.08 percent, which was somewhat low value. There was no significant difference between two groups of the rape in terms of dry matter percentage. Velox showed somewhat higher value in dry matter percentage.

• The Plant Pathology Journal
• /
• v.25 no.3
• /
• pp.294-298
• /
• 2009

Stem canker symptoms were observed in a rape field in Muan, Korea during a disease survey in May 2006. A total of 15 isolates of Phoma sp. were obtained from the infected stems of the plant. All isolates were identified as Leptosphaeria biglobosa based on their morphological and cultural characteristics. The Korean isolates of L. biglobosa were assigned to 'brassicae' among six subclades of L. biglobosa complex based on the entire ITS sequences of rDNA. Pathogenicity of the fungal isolates was confirmed on leaves and stems of rape by artificial inoculation. This is the first report that Leptosphaeria biglobosa causes stem canker of rape in Korea.

• KSBB Journal
• /
• v.24 no.5
• /
• pp.489-494
• /
• 2009

Two-step pretreatment process was investigated to efficiently hydrolyzed rape stems for obtaining fermentable sugars. The process was consisted of two consecutive steps as $200^{\circ}C$ and 15 MPa and $374^{\circ}C$ and 24 MPa with the flow rate of 5 mL/min. Under this condition, 5.5 (g/L) of glucose and 25.6 (g/L) of xylose were obtained from rape stems, showing 18% of glucose yield based on 25% cellulose in the rape stems. It was also found that this process could generate less amounts of toxic residues, such as HMF (Hydroxy- Methyl-Furfural) and other fulfural components during hydrolysis process. It could reaction maintain relatively high ethanol production yield as 90% of theoretical conversion yield from glucose. Therefore, this pretreatment process could be applied to hydrolyze other cellulosic and marine resources such as woods, stem and algae for bioethanol production.

• Journal of The Korean Society of Grassland and Forage Science
• /
• v.9 no.3
• /
• pp.179-186
• /
• 1989

According to the results from the experiments of selecting a suitable variety of forage rape and comparing productivity and nutrient quality between forage rape and oil seed rape, Velox appeared to be the most suitable variety in terms of productivity and nutrient quality at the southern area of Korea among the varieties used in the experiments. Consequently, Velox was grown under two different cultural methods, individual culture and population culture, and productivity and variation of nutrient quality during the growth period were observed and compared between the cultural methods. The results from the experiment are summarized as follows: 1. Although variations were great in plant fresh weight and plant dry matter weight among plants, individual culture showed significantly higher value in these characters at the 1 % level than population culture. Plant fresh weight and plant dry matter weight were largely dependent upon the amount of branches in case of individual culture. However, in population culture, they were equally dependent upon the amount of branches and main stem. There was no significant difference in dry matter percentage between cultural methods, and main stem showed highest dry matter percentage. 2. Content of crude protein was decreasing gradually as plants continued to grow. Individual culture showed higher content of crude protein than population culture from 90 to 120 days after sowing but vice versa from 180 days after sowing to flowering stage. Contents of fiber such as NDF, ADF, cellulose and lignin was low at the early stage of growth. It was increasing gradually as plants grew older and at the latter stage of growth plants under individual culture showed higher values in contents of fiber. 3. In vitro dry matter digestibility (IVDMD) of both stems and leaves was decreasing gradually as plants grew older. Plants under individual culture showed higher IVDMD of stems than plants under population culture, but no significant difference in IVDMD of leaves was observed between cultural methods.

• The Plant Pathology Journal
• /
• v.19 no.1
• /
• pp.69-74
• /
• 2003

Cruciferous crops grown in greenhouses and fields in Korea were surveyed from 1995 to 2000. Sclerotinia rot most severely occurred up to 30％ in cabbage. Incidence of the disease was as high as 20% at its maximum in Chinese cabbage and rape and 10％ in radish, but as low as less than 1 or 2％ in broccoli and kale. Symptoms of Sclerotinia rot commonly developed on loaves and stems of the crucifers, but rarely on rachises of broccoli. A total of 112 isolates of sclerotinia species was obtained from the diseased crucifers. Out of the isolates, 103 isolates were identified as S. sclerotiorum, and the rest as 5. minor based on their morphological and cultural characteristics. S. sclerotiorum was isolated from all the crucifers, while S. minor was isolated from Chinese cabbage, broccoli, and kale. Six isolates of S. sclerotiorum and three isolates of S. minor were tested for their pathogenicity to the crucifers by artificial inoculation. All the isolates of the two Sclerotinia spp. induced rot symptoms on the plants of the crucifers tested, which were similar to those observed in the fields. The pathogenicity tests revealed that there was no significant difference in the susceptibility of the crucifers to the isolates of S. sclerotiorum. However, in case of S. minor, radish was relatively less susceptible to the pathogen.

• Research in Plant Disease
• /
• v.15 no.1
• /
• pp.23-29
• /
• 2009

Cooking oil and yolk mixture (COY), a environmentally acceptable plant protection agent, and COY+$CaCO_3$+neem oil mixture were studied to control the powdery mildew occurring on eggplant, paprika, cherry tomato and maturity tomato in glass houses and vinyl houses during 2005 to 2007. The morphological changes of the pathogenic fungi on the leaf surface before and after treatment of COY were observed. COY made of rape seed oil and COY+$CaCO_3$+neem oil mixture were sprayed three times with 5 days interval to foliar parts of eggplant, paprika and tomato and the disease development were examined 5 days after final spray. In eggplant, the control efficacy of COY to powdery mildew was 94.6%. In paprika, the control efficacy of COY to powdery mildew was 91.6% and that of COY+$CaCO_3$+neem oil mixture was 96.2% that revealed little higher than COY itself. In tomatoes(cherry or maturity tomato), the control efficacy of COY were about 91 %, however, when COY mixture were sprayed to tomato leaves and stems the powdery mildew was controlled completely. Typical and healthy mycelia, conidiophores and condia were observed through scanning electron microscope in COY unsprayed leaf surface, on the other hand destroyed and winkled mycelia and conidiophores were observed in COY treated leaves regardless host plants nor taxonomic differences of fungi.