• Title/Summary/Keyword: Agronomic Characteristics

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Effects of Cutting Frequency and Height on Agronomic Characteristics and Yield Performance of Sorghym-Sudangrass Hybrid (예취횟수와 예취높이가 수수-수단그라스 교잡종의 제형질 발현과 수량에 미치는 영향)

  • 박병훈;강정훈;유시용
    • Journal of The Korean Society of Grassland and Forage Science
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    • v.8 no.1
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    • pp.26-32
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    • 1988

  • This study was conducted to determine the effects of cutting frequency and cutting height on agronomic characteristics and yield performance of sorghum-sudangrass hybrid, cv. Pioneer 855 F on the experimental field of Livestock Experiment Station, Suweon. The results are summarized as follows: 1. The relative contribution of leaf component to total yield was higher when the plants were cut frequently rather than when defoliated only a few times, and tend to be higher with high cutting. 2. Leaf Area Index (LAI) was the highest at the primary growth of two cutting times scheme and the first regrowth for three or four cutting times a year, but LAI, in general, was not related to cutting height. 3. Crop Growth Rate was the heighest at the first regrowth-plants grown in summer, and it was also related to the amount of stubble left at the previous cut. 4. Dead stubbles were not occurred when plants were cut before heading, but those were accompanied by the frequent and low cutting. 5. Total fresh fodder and dry matter yield were the highest at two times cut a year, and decreased with frequent cutting. The optimum cutting height at two times cut was ca. lOCm height stubble from the ground level, but yield increased with higher level cutting at the three or four times cut a year.

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Breeding of High Yielding and Easily Rootable Mulberry Cultivar ′Milsungppong′(Morus bombycis KOIDZ) (다수성이고 발근력이 강한 뽕품종 ′밀성뽕′육성)

  • 성규병;김현복;남학우;이상욱;구태원
    • Journal of Sericultural and Entomological Science
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    • v.43 no.1
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    • pp.9-15
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    • 2001

  • New Mulberry Cultivar, Milsungppong, was selected from F1 seedlings obtained by crossing the female, 4X Keomseolppong, and the male, Kaeryangppong. Local adaptability test has been carried out at five places(Suwon, Chunchun, Cheongju, Kongju and Sangju) for four years since 1992. Leaf quality was tested by silkworm rearing for two silkworm rearing seasons(spring and autumn) at Suwon in 1995. From these tests, Milsungppong was found to be superior to control cultivar, cultivar, Kaeryangppong, in productivity, rootability and shoot cold injury. The new cultivar, Milsungppong, has following agronomic characteristics as compared with Kaeryangppong, the most prevailing cultivar, Milsungppong, has following agronomic characteristics as compared with Kaeryangppong, the most prevailing cultivar in Korea It is triploid cultivar belonging to Morus bombycis KOIDZ with the leaf shape of five lobes, sprouting in spring nearly the same to the Kaeryangppong (Morus alba L.), high leaf yielding of 25% compared to Kaeryangppong (Morus alba L.) and the medium degree of cold resistance. It is adaptable to every where in Korea except the area cold injury broken out habitually. Milsungppong is recommended to rear silkworms not only in spring but also in autumn besides for young silkworms.

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The effect of Sowing Dates on Major Agronomic Characteristics of Dendropanax morbifera $L_{EV}$ in Southern Area of Korea (남부 도서지역에서 황칠나무의 파종기에 따른 주요 형질변이)

  • 최성규;윤경원
    • Korean Journal of Plant Resources
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    • v.14 no.1
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    • pp.60-64
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    • 2001

  • This study was carried out to investigate effects of sowing dates and method on major agronomic characteristics of Dendropanax morbifera $L_{EV}$. in southern area of Korea. The number of days from sowing to emergence was recognized liner negative correlation between sowing days. Dendropanax morbifera was sowed at seven different dates(from Dec.20 to Feb.20 at 30 days interval, from Mar, 1 to Apr. 15 at 15 days interval) in pot culture. In sowing date at Mar. 15, germination rate and early growth were good in pot. Dendropanax morbifera was sowed at five different dates(from Dec.20 to Apr.15 at 15 days interval) in field culture. In sowing date at Apr.15, germination rate and early growth were good in field culture.

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