Browsing by Author "Sparling, Graham P."

Now showing items 1-5 of 5

  • Accumulation of soil organic C and change in C:N ratio after establishment of pastures on reverted scrubland in New Zealand

    Schipper, Louis A.; Sparling, Graham P. (Springer, 2010)
    Rates of organic carbon accumulation and changes in C:N ratio are reported for 10 New Zealand soils converted to pastures from scrub. The data were derived from archive papers originally published in 1964, but which did ...
  • Carbon in soils

    Schipper, Louis A.; Sparling, Graham P. (New Zealand Association of Science Educators, 2009)
    Carbon is the fourth most common element in the galaxy(by mass) but does not even rank in the twelve most abundant elements on Earth. By far the most abundant source of carbon on Earth is in the crust as inorganic rocks ...
  • Multiple small monthly doses of dicyandiamide (DCD) did not reduce denitrification in Waikato dairy pasture

    Watkins, Natalie Lisa; Schipper, Louis A.; Sparling, Graham P.; Thorrold, Bruce; Balks, Megan R. (Royal Society of New Zealand, 2013)
    The effectiveness of multiple small doses of the nitrification inhibitor dicyandiamide (DCD) to decrease denitrification under warm moist conditions was tested in a 1-year field trial on a grazed dairy pasture. DCD was ...
  • Nitrogen, soils and environment

    Schipper, Louis A.; Sparling, Graham P. (New Zealand Association of Science Educators, 2010)
    The article discusses the risk of damaging the environment brought by nitrogen fertilisers which are used for increasing agricultural productivity. The oxidation of ammonium allows for the formation of nitrate. Troposphere ...
  • Rates of accumulation of cadmium and uranium in a New Zealand hill farm soil as a result of long-term use of phosphate fertilizer

    Schipper, Louis A.; Sparling, Graham P.; Fisk, L.M.; Dodd, M.B.; Power, I.L.; Littler, Ray A. (Elsevier, 2011)
    In New Zealand, phosphate (P) fertilisers used in agriculture are the main sources of the potentially toxic elements cadmium (Cd) and uranium (U), which occur as unwanted contaminants. New Zealand is developing draft soil ...