• Title/Summary/Keyword: 생육밀도

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Effect of Inorganic Environmental Factors on the Growth of Pinus koraiensis Seedlings (VII) -The Influence of Shading Pretreatment on the Weight Growth in Transplanting Bed- (무기적(無機的) 환경요인(環境要因)이 잣나무 유묘(幼苗)의 생육(生育)에 미치는 영향(影響)에 관(關)한 연구(硏究) (VII) -이식상(移植床)에서의 중량생장(重量生長)에 대(對)한 피음처리(被陰處理) 영향(影響)-)

  • Kim, Young Chai
    • Journal of Korean Society of Forest Science
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    • v.77 no.1
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    • pp.100-108
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    • 1988

  • This research was performed to estimate the influence of relative light intensity, planting density, growth period on the growth of fresh and dry weight of the stem and branches, and root in the pretreatment transplanting bed. 1. The growth of fresh and dry weight of the stem and branches per seedling varied in the order of 63%>100%>37%>19% in relative light intensity, and increased with decrease of planting density, and grew highly during the period from May to June. The contribution rates to the growth of fresh and dry weight of the stem and branches were 49.4% and 39.6% in shading treatment, and 4.3% and 6.4% in planting density, and 34.2% in growth period respectively. Of the three factors, that is, shading, density and period, all of the interactions between two factors, and among the three factors in the growth of fresh and dry weight of stem and branches were significant. The growth of fresh and dry weight of root per seedling increased with light intensity and decreased with increase of density. The best growth of root, showed during the period from May to June in fresh weight, but during the period from July and August in dry weight of root. For the three factors, that is, shading, density and growth period, all the interactions between any two factors, and among the three factors in the growth of fresh and dry weight of root were significant.

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Interactions among Carbon Isotope Discrimination, Water Use Efficiency and Nitrogen Nutrition in Wheat and Barley (밀과 보리에 있어서 탄소동위원소차별, 수분이용효율, 질소영양간의 상호작용)

  • Young Kil, Kang;Richard A., Richards;Anthony G., Condon
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.41 no.3
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    • pp.318-331
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    • 1996

  • Large and small seeds (44 and 22 mg per caryopsis) of a spring wheat (cv. Kulin) and a spring barley (cv. Skiff) were sown at two nitrogen rates (equivalent to 10 and 32 g m$^{-2}$ ) in well-watered pots under outdoor conditions to determine the effects of seed size and nitrogen (N) nutrition on water use efficiency (WUE) and carbon isotope discrimination ($\Delta$) and to evaluate interaction among $\Delta$, WUE and N nutrition in wheat and barley. Barley produced, on average, 105% more biomass (root＋shoot dry weight) than wheat at stem elongation because of early vigor. By anthesis this difference had disappeared as wheat had 16% more biomass than barley which headed 3 days earlier. Compared to plants grown from small seed, plants grown from large seed had much greater biomass in wheat than in barley at stem elongation and anthesis. Higher N nutrition increased average biomass of wheat and barley by 40 and 31%, respectively, at anthesis. Barley had 35 and 20% greater WUE (biomass gained/transpiration) than wheat at stem elongation and anthesis, respectively, and 2.0 to 3.6% lower $\Delta$ in aboveground shoots depending on growth stages and plant parts than wheat which had a greater stomatal conductance than barley. Seed size had a variable effect on WUE and did not affected $\Delta$ values. Water use efficiency was not affected by N rate at stem elongation in wheat and barley whereas WUE was increased 2 and 7%, respectively, in wheat and barley at anthesis with increasing N from 10 to 32 g m$^{-2}$ . High N plants had about 2.5% lower $\Delta$ values regardless of growth stages than low N plants across species and seed sizes. Carbon isotope discrimination was negatively correlated with WUE at anthesis but not at stem elongation.

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Growth, Productivity and Forage Values of Winter Cereal Crops at Paddy Fields in the Southern Region of Korea (남부지역 논에서 동계 맥류의 생육특성, 생산성 및 사료가치)

  • Seo Young Oh;Jong Ho Seo;Jisu Choi;Tae Hee Kim;Seong Hwan Oh
    • Korean Journal of Agricultural and Forest Meteorology
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    • v.25 no.2
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    • pp.61-70
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    • 2023

  • In order to select high-quality winter cereal crops with high yield and to increase self-sufficiency rate of forage, their growth, yield, and feeding value of several cereal crops cultivated in winter were investigated in the paddy field of the southern region. Four wheat cultivars and green barley headed in early and mid-April, while oat and Italian ryegrass headed in early May. Fresh forage yields of wheats, green barley, and oat were significantly higher than that of Italian ryegrass, and dry forage yields of wheats and green barley were significantly higher than those of not only Italian ryegrass but also oat. In particular, the yield of a wheat cultivar 'Cheongwoo' was the highest. Mineral contents of wheat forages, even though low, were in the range 27.8~33.7mg·g-1 DW suitable for feeding cattle and young female cows. Crude protein content of a wheat cultivar 'Cheongwoo' was high up to 7.6%, similarly to 7.0% requiring for feeding cattle. Feeding values such as total digestible nutrients (TDN) and relative feed value (RFV) of wheats and green barley were superior to those of oat and Italian ryegrass. In addition, dry matter rates of 4 wheat cultivars and green barley were in the range 30~40%, indicating that wheat cultivars and green barley could be used for various feeding purposes such as green or dried forage, and silage. Based on these results, wheat cultivars including 'Cheongwoo' and green barley could be encouraged to be cultivated in paddy fields, as high-quality winter forage crops with high yield.

  • https://doi.org/10.5532/KJAFM.2023.25.2.61 인용 PDF

Effect of Northern Root-knot Nematode, Meloidogyne hapla, on Growth of Codonopsis Zanceolata (당근뿌리 혹선충(Meloidogyne hapla)이 더덕(Codonopsis lanceolata)의 생육에 미치는 영향)

  • Jung Do-Chul;Han Sang-Chan
    • The Korean Journal of Soil Zoology
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    • v.8 no.1_2
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    • pp.27-31
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    • 2003

  • This study has been conducted to assess and analyze the damage of Codonopsis lanceolata by differential inoculation levels of Meloidogyne hapla in pot and plot. As the density of M. hapla increased, early growth of C. lanceolata was inhibited 60% in vine and 54% in root. However, growth of C. lanceolata was not remarkably different by density of M. hapla in the plot test. This result may be attribute to low density of M. hapla in the plot.

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Population Density Changes of Bacteria and Soybean Sprout Rotting Bacteria on Soybean Leaves (콩 잎에 서식하는 세균 및 콩나물 부패균의 밀도 변화)

  • 최재을;이은정;신철우
    • Korean Journal of Plant Resources
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    • v.12 no.2
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    • pp.152-160
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    • 1999

  • Bacterial population density on soybean leaves was $10^2~10^5CFU/cm^2$. Bacterial population density was increased by progress of plant growth stage. Population density of soybean sprout rotting bacteria on soybean leaves was $0~10^3CFU/cm^2$. Population density of soybean sprouts rotting bacteria was related to cultivating area, but not related to plant growth stage. Cultivar and population density of soybean sprout rotting bacteria were less corelated, and varied by plant growth stages and plant parts. Erwina cypripedii, E. carotovora subsp. carotovora, Xanthomonas campestris pv. glycines, Staphylococcus sp., and Micrococcus sp. were identified as pathogenic bacteria causing soybean sprout rot. In generally population density of E. cypripedii, E. carotovora subsp. carotovora, Micrococcus sp., and X. campestris pv. glycines were high.

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