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  • persistence  (1)
  • roots  (1)
  • season  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Distribution of soil invertase in relation to the root systems ofPicea sitchensis (Bong.) Carr. andAcer pseudoplatanus L. during development of young plants (1994)
    Springer
    Plant and soil 167 (1994), S. 73-77 
    Details
    ISSN: 1573-5036
    Keywords: Acer ; invertase ; Picea ; rhizosphere ; roots ; statistics ; trees
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A method is described for sampling rhizosphere soil under newly establishedPicea sitchensis andAcer pseudoplatanus. The technique involves taking soil samples to a depth of 150 mm at 100 mm intervals along transects, each 45° from its neighbour, radiating from the base of the stem. Invertase activities were measured in the soil samples and compared to their activities in fallow and rhizosphere soils. When the field soil was dry, the tree root systems were carefully excavated to retain as many fine roots as possible. The distribution of the soil invertase was matched to the spatial distribution of the roots showing the precise position of the rhizosphere relative to the initial ‘blind’ soil sampling. Statistics were applied to derive equations for calculating the percentage enzyme activity relative to that found in rhizosphere soil at various locations radiating from the base of the stem. This information was subsequently applied to soil sampled under trees of the same age as those excavated to give a non-destructive method for sampling rhizosphere soil routinely from under a large number of trees.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01587601
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of nitrogen on fine white root persistence in cherry (Prunus avium) (1995)
    Springer
    Plant and soil 173 (1995), S. 349-353 
    Details
    ISSN: 1573-5036
    Keywords: borescope ; cherry ; nitrogen ; persistence ; root ; season
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The persistence of white roots in cherry (Prunus avium) grown under two levels of nitrogen (high and low), was studied directly using a non-destructive borescope system. Plant growth and nitrogen uptake was increased by the extra nitrogen. Persistence times of white roots were significantly affected by several factors such as nitrogen level, time of appearance and depth in the pot. Suberisation of white roots tended to be late in the growing season, and roots produced in the middle of May persisted as white for significantly longer (5.9 weeks) than those produced in early July (2.5 weeks). Also, roots that appeared at the foot of the pot remained white for longer (5.6 weeks) than roots at the surface of the pot (2.7 weeks). Results also suggest that white root persistence was greater for trees with the lower rate of application of nitrogen (4.5 weeks under low nitrogen compared to 3.6 under high nitrogen).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011474
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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