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  • 1
    Electronic Resource
    Electronic Resource
    Sulfur coating of urea treated with attapulgite clay (1991)
    Springer
    Nutrient cycling in agroecosystems 28 (1991), S. 123-128 
    Details
    ISSN: 1573-0867
    Keywords: Sulfur coating ; urea ; attapulgite clay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A commercial attapulgite-type gelling clay was added as a conditioning-hardening agent to urea which was then tested as a substrate for sulfur coating. The coating tests were made in bench-scale batch equipment. The total coating weights and the 7-day dissolution rates of the sulfur-coated products were determined and compared with those from similar tests of previously made sulfur-coated urea products containing calcium lignosulfonate or formaldehyde. Compared with urea substrates containing formaldehyde, the urea containing attapulgite clay required about one-third less sulfur coating to attain the same 7-day dissolution rate. The urea containing attapulgite clay and the urea containing calcium lignosulfonate were about equally effective as substrates for sulfur coating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048864
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  • 2
    Electronic Resource
    Electronic Resource
    Long-term trends in NADP/NTN precipitation chemistry data: Results of different statistical analyses (1995)
    Springer
    Water, air & soil pollution 85 (1995), S. 595-601 
    Details
    ISSN: 1573-2932
    Keywords: Long-term trends ; sulfate ; statistical models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract This paper summarizes the results of four statistical approaches for the estimation of long-term trends (1983–92) in sulfate concentration data from 90 monitoring sites across the United States. Least squares regression models and nonparametric techniques were applied to these data. Sulfate concentrations were found to be generally decreasing on the order of 0–4% at most sites. There was general agreement that trends were significant in the Great Lakes, Pacific northwest, and southwest regions. Although strengths and weaknesses are described for each approach, all of these approaches are useful for long-term trend estimation. Visualization techniques are recommended for displaying trend patterns and associated levels of statistical significance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00476894
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    Paper (German National Licenses)
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