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  • 1990-1994  (2)
  • 1991  (2)
  • acidity  (1)
  • chloroplast number  (1)
  • Analytical Chemistry and Spectroscopy
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  • 1990-1994  (2)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 134 (1991), S. 65-72 
    ISSN: 1573-5036
    Keywords: acidity ; aluminium ; calcium ; citrus ; continuous-function design ; legumes ; manganese ; phosphorus ; soil mineral ; sulphur ; variable charge ; weathered soils
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Plant-soil interactions in weathered soils are so complex that unqualified statements about a suitable pH for plants are risky. Conventional experimental designs and statistical methods may not be appropriate for investigating such complexities. Lime experiments using continuous function designs and observation of plant response to indigenous variability in soil pH permit detailed observations of plant-soil interactions that are frequently not detected. A graphical boundary-line approach to interpreting data can make good sense out of apparent confusion. Increasing the pH of variable-charge soils by adding lime or by indigenous means increased CEC and retarded cation leaching, but Ca solubility changed very little over the range pH 5 to 6. N fixation and yield was closely related to soil pH, soil Mn and Mn uptake by soybean. This result was clearly demonstrated regardless of numerous other limiting factors. Plant yield response curves resolved into distinct segments that corresponded with associated soil properties. Excess Al compounded by Ca deficiency is suspect in the pH range 〈5. Excess Mn, and Ca deficiency probably limited yields in the pH range 5.0 to 5.7. Yields were stable, and Ca and P were constant in the pH interval 5.7 to 6.0. Yields abruptly increased in the pH interval 6.0 to 6.3. This was associated with elevated Ca concentrations in soil solutions.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5060
    Keywords: Lolium multiflorum ; Italian ryegrass ; Lolium perenne ; perennial ryegrass ; cell size ; chloroplast number ; colchicine-induced changes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A 3 hr period of treatment with a 0.2% aqueous solution of colchicine was given to one week old seedlings of 3 inbred lines of perennial ryegrass (Lolium perenne) and 4 lines of Italian ryegrass (L. multiflorum). The surviving plants developed as mixoploids and were self-pollinated. In the following generation (CT1) the seeds were grown without further treatment, and were screened cytologically at the seedling stage to separate out diploids from tetraploids. Only the diploids were kept, and in this CT1 generation comparisons were then made between controls (2x) and colchicine-treated diploids (C2x) for leaf mesophyll cell size and chloroplast number variation. Heritable differences were found such that the cell plan areas and/or the numbers of chloroplasts per cell were significantly greater in the C2x compared with the 2x treatment in 3 and 5 out of the 7 lines. In each case there was enhancement of chloroplast numbers independently of the variation in cell size.
    Type of Medium: Electronic Resource
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