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  • Beta distribution  (2)
  • Springer  (2)
  • Oxford University Press
  • 1985-1989
  • 1980-1984  (2)
Collection
Keywords
Publisher
  • Springer  (2)
  • Oxford University Press
Years
  • 1985-1989
  • 1980-1984  (2)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Statistical distributions of root maximum growth pressures, root buckling stresses, and soil penetration strengths (1984)
    Springer
    Plant and soil 77 (1984), S. 39-51 
    Details
    ISSN: 1573-5036
    Keywords: Beta distribution ; Cotton ; Pea ; Peanut ; Pearson distribution ; Penetrometer ; Safflower ; Soybean ; Sunflower
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary It is shown that root maximum growth pressures, root buckling stresses, and soil penetration strengths and all non-normally distributed with positive skew. It is found that a Beta distribution, with assigned end points, provides an extremely good fit in each case. It is recommended that this Beta distribution is used in the development of mathematical models for root growth in soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182810
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The behaviour of roots encountering cracks in soil (1984)
    Springer
    Plant and soil 79 (1984), S. 11-28 
    Details
    ISSN: 1573-5036
    Keywords: Beta distribution ; Buckling ; Cracks ; Crack width ; Lateral roots ; Pea ; Penetration ; Penetrometer ; Rape ; Remoulded soil ; Roots ; Safflower ; Seminal axes ; Soil strength ; Undisturbed soil ; Wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary It is shown that probabilities of root penetration across cracks in soil can be calculated effectively using a mathematical model involving root stress and soil distributions and penetrometer/root stress ratios. Penetration criteria are developed, and it is found that the effective penetrometer/root stress ratios take values of about 4 for crack widths smaller than about 2 mm and about 8 for wider cracks. Root swelling does not appear to contribute significantly to the probability of root penetration through any effect on root buckling stress. Suggestions are made for further work on the effects of soil structure and strength on root behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182140
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    Paper (German National Licenses)
    Fulltext
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