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The objective of this study was to determine the response of rapeseed (Brassica napus) to different planting date in the spring and varieties on growth and flowering characteristics. Eight rapeseed varieties were sowed at 10 day interval from 1st to 31th of March at Muan and Jeju in Korea. Significant planting dates and rapeseed varieties effects for growth, start of flowering and duration. As the planting date was being delayed, plant length and flower number were decreased, but branch number was increased. And, start of flowering date was retarded and flowering duration decreased with later planting date. Days from planting to flowering was shortened as seeding date was delayed and shortening degree was similar between experimental locations, Muan and Jeju. The days to flowering for rapeseed about 73~94 days for 1st March and then decreased to 57~71 days for the 31th March of planting date. `Tammiyuchae` and `Mokpo 111` seeded on each planting date come into blossom more earlier about 10 days as compared to `Tamlayuchae` and `Naehanyuchae`. The duration of flowering for the B. napus varieties was shortened as planting date was delayed. The results revealed that flowering characteristics of rapeseed can be greatly enhanced by planting as early as possible, and early flowering varieties i.e. `Tammiyuchae` and `Spring` were the most suitable varieties among the tested varieties for planting in the spring.

The objective of this study was to determine the effectiveness of rapeseed meal in controlling soil nematode. Two different rapeseed meals (Jeju local rape varieties and ‘Sunmang’ variety) were mixed with the soil to control nematodes environmentally. When soil physical properties in the rapeseed meal-mixed soils were analy zed, OM (organic matter), P 2 0 5 , Ca, Mg, CEC (Cation Exchange Capacity) value increased. Especia lly, the level of OM was 3-fold higher than control soil. Glucosinolate content of rapeseed meal was higher in Jeju local rape varieties than ‘Sunmang’ variety. The major components of glucosinolates were consisted of progoitrin, gluconapin, glucobrassiaca napin, and sinigrin. These components were likely to be involved in reducing nematode density. Key words - Rapeseed meal, Nematode, Continuous cultivation, Glucosinolate, Soil *교신저자(E-mail): j570510@korea.kr ⓒ 본 학회지의 저작권은 (사)한국자원식물학회지에 있으며, 이의 무단전재나 복제를 금합니다.This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Interspecific crosses between rapeseed (Brassica napus L.) and chinese cabbage (B. campestris var. pekinensis Makino) and turnip (B. rapa L.) were made in order to examine the cross possibility and morphological phenotype of F1 hybrid. The growth of pollen tube of cross between rapeseed and chinese cabbage was more rapid than cross between rapeseed and turnip. Silique formation and seed setting in silique were relatively high in the cross between rapeseed and chinese cabbage. The percentage of silique set from interspecific cross between rapeseed and chinese cabbage was 90.6% and higher 23.3% than the percentage of silique from interspecific cross rapeseed and turnip. The average number of seed per silique obtained from the cross rapeseed and chinese cabbage, and rapeseed and turnip reached 15.5 and 11.6, respectively. The morphological phenotypes of F1 hybrid plants obtained from seeds in the cross between rapeseed and chinese cabbage resembled rapeseed mainly, but leaf length and leaf width were increased. The size, shape and lobation of leaves of F1 hybrid plants from interspecific cross between rapeseed and turnip were intermediated between their parent species, but color of leaves was dark-green.

This study was carried out to find the effect of sowing time on oil content and fatty acid composition of 6 domestic rapeseed cultivars, `Sunmang`, `Tammiyuchae`, `Tamlayuchae`, `Naehanyuchae`, `Yongsanyuchae` and`Hallayuchae`. The delaying sowing date was negatively correlated with oil content (), indicating that oil content was higher with earlier sowing date. Fatty acid composition was similar in all cultivars. The delaying sowing date was positively correlated with the increment of stearic acid () and linoleic acid (), while was inversely correlated with palmitic acid () across all 6 cultivars.

This study was carried out to understand the effect of sowing date on growth characteristics, flower duration of a total of 6 domestic rapeseed cultivars, "Sunmang", "Tammiyuchae", "Tamlayuchae", "Naehanyuchae", "Yongsanyuchae" and "Hallayuchae" with different sowing dates (25 Sept., 5 Oct., 15 Oct., 25 Oct., 5 Nov.) in Muan, Jeollanamdo, Republic of Korea. The results obtained were summarized as the follows: The number of seedling stand after overwintering was decreased in all 6 cultivars. It changed little until 5 Oct., and then showed continuously largely decrease as the sowing date being delayed. As the sowing date was being delayed, plant height was decreased while Silique length and thousand seed weight were increased. Seed yield in all 6 cultivars decreased almost linearly with late sowing date. In correlation analysis between the delaying sowing date and growth characteristics, it was inversely correlated with plant height ($r

In order to evaluate their potential as sources of biodies el, oil content and fatty acid composition of seeds and fatty acid methyl ester (FAME) properties from seven woody oil plants in Korea were analysed. The oil content of seed of all woody plant species ranged from 15.1 ( Ligustrum lucidum ) to 70.3% ( Camellia japonica ) by dry weight. Fatty acid composition consisted mainly of oleic acid, linoleic acid, lino lenic acid, palmitic acid and stearic acid, with oleic acid bein g the most abundant. The content of unsaturated fatty acids of all species was higher than saturated fatty acids. Oxidation stability of seed oils of all woody plants ranged from 2.25 to 8.62 hours/110 ℃. Fatty acid methyl ester of Styrax japonica has been found to have the highest iodine value, indicating that unsaturated fatty acid content is higher than other seed oils. Cold filter plug point(CFPP) was varied over a wide range from 0 ℃ to –13℃. The cold fluidity of FAME of Chionanthus retusa were excellent.