• Title/Summary/Keyword: Cropping Systems

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Design of Three Tier Cropping Systems in Greenhouse Using The Sun Light (자연광을 이용한 3단 재배 시스템의 설계)

  • 김기성;김문기;권혁진
    • Proceedings of the Korean Society for Bio-Environment Control Conference
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    • 1999.04a
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    • pp.92-95
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    • 1999

  • 재배시설내의 재배면적은 온실의 경우 벤치의 구성 방법에 따라서 차이는 있으나 바닥 면적의 47-68% 정도로 전체 면적에 비하여 생산에 사용되는 면적의 효율이 높지 못한 편이다(Langhans, 1990). 이러한 재배면적을 최대로 확보하여 단위 면적당 생산량을 높이기 위한 연구가 자동화 온실이나 식물공장을 중심으로 진행되고 있다. 이러한 연구는 많은 성과를 거두고 있으나 인공광을 이용하거나, 부가적인 기계화 장비나 자동화 설비가 필요하여 에너지 비용과 시설비용이 무시 못 할 정도이며, 고도의 제어기술이 요구되고 있어 상업용으로 보급되지 못하고 있다. (중략)

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III. Plant Characters of Korean Indigenous Corn Lines (재래종 옥수수 수집종에 대한 특성조사 (III))

  • In-Sup Lee;Bong-Ho Chae
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.24 no.1
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    • pp.92-98
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    • 1979

  • Korean local corn lines from various regions in the country were studied for the plant characters such as flowering days. plant height. growth rate. number of ears per plant. leaf size. brace roots and tillers. All the lines without exception were different in plant characters studied and the difference were also apparent among regions from where the original lines were obtained. The variation among lines and original regions indicated that the plant characters were quite dependent upon the magnitude of traditional cultural practices and other environmental factors such as precipitation or cropping systems in regions concerned.

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Studies on Corn-Legume Intercropping System IV. Effects of corn-soybean intercropping on chemical composition and TDN yield (Silage용 옥수수와 두과작물의 간작에 관한 연구 IV. Silage용 옥수수 (Zea mays L.) 와 콩 ( Glycine max (L.) Merr.) 의 간작이 영양성분함량 및 TDN수량에 미치는 영향)

  • 이성규
    • Journal of The Korean Society of Grassland and Forage Science
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    • v.9 no.2
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    • pp.113-118
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    • 1989

  • This experiment was carried out to compare chemical composition, TDN yield of corn-soybean intercropping and corn monocropping forage plants at different harvesting time and obtained the following results. 1. In both cropping systems, the content of chemical composition of forage were changed same pattern in growing stage. The content of crude protein in corn-soybean intercropping forage at yellow stage increased more than that of corn nonocropping forage, while the crude fat in corn monocropping forage plants increased than that of corn-soybean intercropping forage plants at mature stage. 2. The crude fiber, crude ash, ADF content of forage plants in both cropping system decreased same pattern in growing period, however, NFE content of forage increased with maturity. 3. TDN yield of corn-soybean intercropping and corn monocropping forage plants at yellow stage obtained similar results and TDN yield per 10a in intercropping and monocropping were 1006.lkg and 978.6kg, respectively. 4. Consequently, corn-soybean interaopping system could be increased crude protein yield without decreasing of dry matter yield in comparison with corn monocropping system for corn silage.

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An Efficient Perspective Projection using $\textrm{VolumePro}^{TM}$ Hardware (볼륨프로 하드웨어를 이용한 효율적인 투시투영 방법)

  • 임석현;신병석
    • Journal of KIISE:Computer Systems and Theory
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    • v.31 no.3_4
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    • pp.195-203
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    • 2004

  • VolumePro is a real-time volume rendering hardware for consumer PCs. However it cannot be used for the applications requiring perspective projection such as virtual endoscopy since it provides only orthographic projection. Several methods have been presented to approximate perspective projection by decomposing a volume into slabs and applying successive parallel projection to thou. But it takes a lot of time since the entire region of every slab should be processed, which does not contribute to final image. In this paper, we propose an efficient perspective projection method that makes the use of several sub-volumes with cropping feature of VolumePro. It reduces the rendering time in comparison to slab-based method without image quality deterioration since it processes only the parts contained in the view frustum.

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Studies on Corn-Legume Intercropping System II. Effect of corn-cowpea intercropping system on chemical composition and yield (Silage용 옥수수와 두과작물의 간작에 관한 연구 I. Silage용 옥수수 ( Zea mays L. )와 동부 ( Vigna sinensis King ) 의 간작이 영양성분함량 및 수량에 미치는 영향)

  • 이성규
    • Journal of The Korean Society of Grassland and Forage Science
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    • v.8 no.3
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    • pp.128-134
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    • 1988

  • This experiment was carried out to compare chemical composition of corn-cowpea intercropping and corn monocropping plants at different harvesting time and obtained the following results. 1. In both cropping systems, the contents of crude fat and nitrogen free extract (NFE) were significantly increased (P<0.01), while that of crude protein, crude fiber and crude ash were decreased (P<0.01) with each harvesting time. 2. The acid detergent fiber (ADF) and crude fiber contents were decreased same patterns in growing period, however, according to maturing of corn ears the difference between ADF and crude fiber contents reduced. 3. At mature stage, crude protein yields per 10a in corn monocropping and corn-cowpea intercropping system were 127.6kg and 152.lkg, respectively. The difference of crude protein content between corn-cowpea intercropping and corn monocropping system was 19.2%. 4. TDN yields of each cropping system, at mature stage, obtained similar results and TDN yields per 10a of corn monocropping and corn-cowpea intercropping system were 1006.lkg and 990.1, respectively. 5. Conseqently, corncowpea intercropping system could be increased protein yield without decreasing of dry matter yield in comparison with corn monocropping system.

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