• 제목/요약/키워드: direct seeding

검색결과 420건 처리시간 0.026초

남부지방세서 파종량과 파종방법이 수량성에 미치는 영향 (Effect of Sowing Amounts and Treatments on Agronomic Characteristics and Yield in Schizonepeta tenuifolia Briquet in Southern Part of Korea)

  • 권병선;김상곤;박희진
    • 한국자원식물학회:학술대회논문집
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    • 한국자원식물학회 2000년도 제7차 국제 심포지움(생약자원개발에 관한연구) 및 추계정기 학술발표회 초록집
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    • pp.46-52
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    • 2000

  • 남부지방에 적합한 형개의 파종방법과 파종량을 구명하고자 시험하였던 결과를 요약하면 다음과 같다. 1. 수량구성 형질에서 경장, 절수 및 수수는 10$\ell$당 $1.5\ell$의 소식 파종구보다 3.5$\ell$의 최다 밀식 파종구에서 길고 많았으며 분지수, 수장, 직경의 형질은 이와는 반대의 경향으로 $1.5\ell$의 소식 파종구보다 3.5$\ell$의 최다 밀식구에서 적고 짧았으며 가늘어졌었다. 2. 생경수량은 10a당 $1.5\ell$의 소식 파종구보다 3.5$\ell$의 최다 밀식 파종구에서 조파, 산파 모두 수량성이 높았다. 3. 건경수량은 조파구에서는 10a당 2.5$\ell$ 파종구에서, 산파구에서는 3.5$\ell$의 파종구에서 수량성이 높았다.

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Effects of Growth Retardants on Lodging-related Traits in Direct Seeded Rice on Flooded Paddy Surface

  • Ju, Young-Cheoul;Park, Jung-Soo;Han, Sang-Wook;Park, Kyeong-Yeol;Rho, Young-Deok
    • 한국작물학회지
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    • 제44권3호
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    • pp.248-252
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    • 1999

  • This study examined the effects of growth retardants and midsummer drainage on lodging-related characters in direct seeding rice culture on flooded paddy surfaces. Treatments included in this study were continuous flooding, two time midsummer drainages (TTD), and inabenfide or trinexapac-ethyl application after TTD. Culm length was reduced most by 11.4cm in trinexapac-ethyl treatment after TTD, followed by 4.1cm in inabenfide treatment after TTD compared to TTD treatment. A significant reduction in culm length occurred at the 3rd internode in inabenfide treatment applied at 40 days before heading (DBH), while trinexapac-ethyl application at 8 DBH reduced the 3rd>2nd>1st internode. The culm diameter of the 4th internode was increased by the application of trinexapac-ethyl following TTD compared to TTD treatment. Thickness of culm wall was significantly increased by trinexapac-ethyl but not by inabenfide applications. Lodging index was the highest in continuous flooding and the lowest in trinexapac-ethyl treatment after TTD. Subsequently, field lodging did not occur in plots treated by trinexapac-ethyl. Rice plants subjected to midsummer drainage or growth retardants showed higher ripened grain ratio and 1000-grain weight, resulting in higher rice yield. These results indicate that trinexapac-ethyl, which can be applied at the relatively later growth stage after proper judgement of lodging occurrence, could be a useful tool for reducing lodging in direct seeding rice culture on flooded paddy fields.

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Varietal Difference in Root Distribution of Direct Seeded Rice

  • Kim, Hyun-Ho
    • 한국작물학회지
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    • 제43권1호
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    • pp.38-43
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    • 1998

  • This study examined root growth and distribution under the direct seeding of rice cultivars developed in Korea, Japan, and the U.S. Cultivars from the U.S., especially 'M202' and 'Caloro', had a high ratio of the dry matter partitioning for root and top plant components. Caloro had high root and top growth. 'Koshihikari' from Japan showed the lowest ratio of R/T (root/total dry matter) due to the small amount of root and top plant growth. Most Japanese cultivars except transplanted 'Hatsuboshi' showed low ratio of R/T. Patterns of root distribution for each soil block were recorded by the root box-pin board method. Roots of all cultivars were distributed in blocks A, C, and E in the middle of box, i.e., just below the plant base. Roots of 'Dongjin', M202, and Caloro were distributed deeper than the others. Roots of transplanted Hatsuboshi developed much better than direct seeded Hatsuboshi. Total root weight density was highest in Caloro followed by Dongjin, 'Gancheok', 'Calrose', and the others. The root density of Caloro was twice as much as those of the others except Dongjin. According to cumulative percentages of root distribution on each soil layer, roots of most cultivars were distributed below 20cm. The U.S. cultivars showed vertically well developed root systems as compared to others. A large amount of roots were distributed in the top 15cm of soil layer for Hatsuboshi and Koshinikari, and their root systems appeared to be shallow. In contrast, the rates of root distribution in the top 10cm of soil layer were low for Dongjin, Calrose, and Caloro. These cultivars had relatively deep root systems.

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