• Title/Summary/Keyword: agronomic

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COMPARISON OF VARIABILITY IN BREEDING METHODS FOR RESISTANCE TO BACTERIAL WILT IN FLUE-CURED TOBACCO (황색종 연초의 세균성마름병 저항성품종 육성을 위한 육종방법 비교)

  • 진정의;고미석
    • Journal of the Korean Society of Tobacco Science
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    • v.9 no.2
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    • pp.11-24
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    • 1987
  • Lines were developed from the two crosses, BY4 X NC 82 and BY 4 X BY 104, by bulk, backcross and anther-derived dihaploid methods of breeding , and their variations in major agronomic, chemical characters, heritability, and response to selection were compared. 1. The anther-derived dihaploid lines showed a greater genetic variability and heritability in characters investigated than the lines developed by the other two methods of breeding . However, those were Inferior In agronomic characters and yielded 15.4% less leaf tobacco than the lines developed by the bulk method. 2. The lines developed by bulk method were higher In the frequency of lines resistant to bacterial wilt and in the yield, but Its lines appeared later flowering. inferior leaf Quality, and higher total nitrogen contents than those developed by the backcross method of breeding. 3. In the population of the lines developed by the backcross method, bacterial wilt resistant lines were less frequent, but the lines with a good leaf quality were more frequent.

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Agronomic Practces on Intensive Pasture Establishment (집약초지의 조성기술)

  • 김동암;조무환
    • Journal of The Korean Society of Grassland and Forage Science
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    • v.2 no.2
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    • pp.1-15
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    • 1981
  • In reviewing of the literature concerning agronomic practices on intensive pasture establishment the following suggestions were made : (1) The seedbed preparation should be involved physical manipulation of the soil tilth and consolidation of the soil by harrows and heavy roller. (2) In terms of methods of sowing, drilling favours the first and broadcasting the second however, the apparent superiority of band sowing over the above conventional methods is to reduce the direct toxic chemical effects from fertilizers to germinating seeds. (3) The most satisfactory seeding depth for grasses and legumes is commonly agreed to be approximately 1.3cm and seeding depth greater than 2.5cm seems to be generally detrimental. (4) Autumn and spring are most common sowing periods for grasses and legumes, however, early autumn being the most generally favoured, particularly in areas not subject to severe winter kill. (5) Select nurse crop species or cultivars which make Bess demands on light, nutrients and water, and lower seed rates should be used. (6) Seeding mixtures should be simple rather than complex and aggressive species should be included to a minor extent.

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Pesticide Risk and Benefit Assessment

  • Birtley, Robin D.N.
    • Korean Journal of Weed Science
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    • v.13 no.4
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    • pp.195-202
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    • 1993
  • The benefits of pesticides in improving the food quantity and quality requirements for an increasing world population are significant, and they can be described in agronomic, economic and social terms. The risks are assessed from the hazards which are likely to occur in practice ; the hazards are defined by the toxicity of the pesticide to non-target organisms at various exposure levels. There are ways of reducing the risks (mainly by reducing exposure in practice) and improving the benefits of pesticides ; these are known as risk management and benefit management respectively. The overall risk-benefit assessment is facilitated if each component can be expressed in financial terms, but it must be made nationally or locally on a sound technical basis against the prevailing agronomic, socio-economic and political circumstances. Paraquat is used to illustrate the risk-benefit assessment process in general terms, and the conclusion is that the benefits greatly outweigh the risks. It is important to keep the risks of pesticides in perspective with those associated with other naturally occurring chemicals in our diet and with other everyday aspects of life. In an overall context, the pesticide risk is small.

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Combining Ability in Mungbean (Vigna radiata (L.) Wilczek) I. Agronomic Traits

  • Srinives, P.;Khattak, G.S.S.;Haq, M.A.;Ashraf, M.
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.46 no.5
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    • pp.420-423
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    • 2001
  • Combining ability in mungbean was studied in 15 quantitative traits through a 6 $\times$ 6 diallel cross. Both additive and non-additive gene effects were found conditioning the inheritane of nodes of the first peduncle, clusters per plant, clusters on main stem and branches, pods per plant, 1000 seed weight, grain yield per plant, biomass, and harvest index. The additive gene action was found significant for nodes on main stem, average internodal length, branches per plant, pods per cluster, pod length, and seeds per pod. The predominace of additive genetic variance was observed in all traits. For grain yield and yield components, the best combiner were VC3902A, VC1560D and ML-5, while the best combinations were the crosses VC3902A $\times$ ML-5, VC1560D $\times$ ML-5, and NM 92 $\times$ VC1560D.

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Fertility and Some Agronomic Characteristics of ′Sawonppong26′ Autotetraploid Artificially derived from Keomseolppong (Morus spp) (검설뽕의 동질4배체 ′4원뽕26호′의 임성 및 재배학적 특성)

  • 박광준;이용기
    • Journal of Sericultural and Entomological Science
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    • v.42 no.2
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    • pp.67-72
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    • 2000
  • Autotetraploid 'Sawonppong 26'was induced by dropping clochicine solution in growing point of Keomseolppong which is of high rootability and some agronomic charactelistics are as follows. Sawonppong 26 is a tetraploid of Keomseolppong with 56 of the chromosome number. Its fertlization percent was 59.4% and the germination percent of sank seed was normal. Sugar degree of mulberry fruit was 13.3% and total acidity was 0.69%. Single fruit weight of Sawonppong 26 was increased by 79%, as compared to that of Keomseolppong. Even though percent of survival of hard wood cutting was 94%, number of rootings was less and diameter of root was slender, it is expectedly a promising variety to be used for a breeding parent from the aspect of rootability.

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Effects of Rhizome Size and Mulching Materials on Agronomic Characteristics and Yield in Zingiber mioga ROSC. (양하(Zingiber mioga ROSC.) 지하경 크기와 피복재료가 주요형질과 수량에 미치는 영향)

  • 최성규;이종일
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.38 no.2
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    • pp.112-116
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    • 1993
  • The experiment was carried out to investigate the influence of rhizome size and mulching materials on some agronomic characters and flower-head yield of Gingiber mioga ROSCOE. The larger the size of rhizome was, the more the number of leaves developed, and the higher the yield was. The most suitable rhizome size for planting was found to be from I2cm to 15cm. Rice straw and polyethylene film mulching materials increased the soil porosity and reduced change of the soil moisture content. The yield of flower-head was highest in the straw-mulching plot, indicating that straw would be the best mulching material for growth and yield of flower-head in Gingiber mioga ROSCE.

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Effects of Topping Methods on Root Yield and Major Agronomic Characteristics in Alisma plantago

  • Kwon, Byung-Sun;Hyun, Kuy-Hwan
    • Plant Resources
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    • v.7 no.3
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    • pp.211-215
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    • 2004
  • The effects of topping method on the yield and major agronomic traits of two varieties, Sunwol and Youngjun of Alisma plantago, were investigated in the Southern region. Plant height, yield of fresh root, yield of dry root and weights of total roots were the highest in the variety of Sunwol, and at the plots with topping of four times cutting in flowering in main culm (Treatment No.1). Considering from our results, optimum topping method is most likly be topping of four times cutting in flowering in main culm in the Sunwol variety.

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Development of KB 108, a New Burley Tobacco(Nicotiana tabacum L.) Variety and its Agronomic Characteristics (버어리종 연초 신품종 KB 108의 육성 및 특성)

  • 정석훈;최상주;조천준;김대송;조명조;이승철
    • Journal of the Korean Society of Tobacco Science
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    • v.16 no.1
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    • pp.57-64
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    • 1994
  • Burley tobacco (Nicotiana tabacum L.) KB 108 was developed from a single cross between KB 104 and TC 591 which was developed from a cross between Burley 49 and Tobacco Introduction 1406. It was tested for its resistance to black shank, potato virus Y(PVY), TMV and agronomic characteristics under field conditions. KB 108 has resistance to tobacco mosaic virus(TMV) and necrotic strain of potato virus Y(PVY-VN) with secreting glandular trichomes. It has also moderate resistance to black shank caused by phytophthora parasitica val. Nicotianae. KB 108 has an up-right plant growth habit similar to Burley 21. It flowers about 1-2 days later than Burley 21. The leaf width and length of KB 108 are approximately 3 cm wider and longer than those of Burley 21. The yield of KB 108 was higher 4%, nearly equal in value per kg compared to Burley 21.

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Agronomic Characteristics of Alisma plantago as Affected by Transplanting Dates of in Southern Parts of Korea

  • Shin, Dong-Young;Lim, June-Taeg;Hyun, Kyu-Hwan;Kwon, Byung-Sun
    • Korean Journal of Plant Resources
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    • v.21 no.3
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    • pp.192-195
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    • 2008
  • This study was conducted to find out some important agronomic characteristics and qualities in response to different transplanting dates in Alisma plantago at southern parts of Korea. Yield components such as number of floral axis per plant, plant height and number of leaves were highest at the transplanting date of Aug. 15 and Aug. 25. Plants sown at Aug. 15 and Aug. 25 also showed highest yield. Considering from our results, optimum transplanting date were semed to be transplanting date of Aug. 15 and Aug. 25.