Articles by Keyword: Nitrogen Mineralization

Search results for Nitrogen Mineralization

We found 173 results for you
  1. Loss of nitrogen fertility and its restoration in some Orange Free State soils

    Loss of nitrogen fertility and its restoration in some Orange Free State soils

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The effects of present or past cultivation on nitrogen fertility in some central Orange Free State soils were investigated by the comparison of paired samples of cultivated or reverted soils with uncultivated soils situated as closely as possible to one...
  2. Long-term effects of conservation practices on the nitrogen fertility of a soil cropped annually to wheat

    Long-term effects of conservation practices on the nitrogen fertility of a soil cropped annually to wheat

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Sustainable farming in the semi-arid interior of South Africa requires the adoption of conservation practices to maintain and, if possible, increase soil fertility. The effects of some such practices on the nitrogen fertility of a hydromorphic sandy clay loam soil...
  3. Measurements of mineralization, nitrification and denitrification in laboratory incubations of soil from a semi-arid natural grassland

    Measurements of mineralization, nitrification and denitrification in laboratory incubations of soil from a semi-arid natural grassland

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Experiments were done to compare three incubation methods after it was found that prolonged incubation of soil in sealed preserving jars resulted in the exhaustion of head- space oxygen and anaerobiosis in the soil. Nitrate added to soil from the...
  4. Effects of sample drying temperature on indices of available nitrogen in soils

    Effects of sample drying temperature on indices of available nitrogen in soils

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    During a field trial investigation into the long-term effects of conservation practices on the nitrogen fertility of a soil cropped annually to wheat, it was observed that sample preparation had an effect on some indices of available nitrogen. The trial...
  5. Evaluation of an undisturbed-soil incubation method as an index of soil nitrogen availability in a limed and non-limed soil

    Evaluation of an undisturbed-soil incubation method as an index of soil nitrogen availability in a limed and non-limed soil

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Nitrogen mineralization potentials were determined using an undisturbed-soil incubation procedure. The purpose of this study was to evaluate the above-mentioned method as an index of soil nitrogen availability. Undisturbed soil samples (0–150 and 150–300 mm) of a limed (pH 7.3)...
  6. The lower and upper threshold values, biological optimum and mineralization of nitrogen in the main maize producing soils of South Africa

    The lower and upper threshold values, biological optimum and mineralization of nitrogen in the main maize producing soils of South Africa

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    There is still no consensus in South Africa on the parameters used to advise maize farmers on the quantity of N needed for optimum yields. In order to determine the lower and upper threshold values for nitrogen (N), the biological...
  7. Effects of liming on microbial activity and N mineralization in broiler manure-amended soils from Bizana, Eastern Cape, South Africa

    Effects of liming on microbial activity and N mineralization in broiler manure-amended soils from Bizana, Eastern Cape, South Africa

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A laboratory incubation study was conducted to determine the effects of liming on microbial activity and N mineralization in two Bizana soils amended with broiler manure. The experimental layout was a 4 x 3 complete factorial experiment with three replicates,...
  8. Influence of Soil Organic Matter Content on the Responsiveness of <em>Eucalyptus grandis</em> to Nitrogen Fertiliser

    Item type: Journal Article • Journal: South African Forestry Journal
    It is widely recognised that the inherent nitrogen (N) mineralisation capacity of a soil is directly related to the organic matter content. Consequently, in estimating the N requirements of Eucalyptus grandis at planting this mineralisation potential must be taken into...
  9. The Amelioration of <em>Pinus patula</em> Mortality on Former Agricultural Sites through Fertilisation: A Bioassay and Greenhouse Study

    Item type: Journal Article • Journal: South African Forestry Journal
    Recent expansion of the timber industry into areas previously used for agronomic production has, in many cases, resulted in poor growth of Pinus patula and P. elliottii seedlings and in certain instances complete stand failure. A bioassay study was initiated...
  10. The effect of nitrogen on the development and photosynthetic activity of <em>digitaria eriantha</em> steud. subsp. <em>eriantha</em>

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Digitaria eriantha Steud. subsp. eriantha, plants were grown under controlled conditions and treated with different concentrations and forms of nitrogen. The plants showed a preference for nitrate nitrogen, as opposed to ammonium nitrogen, with greater total dry matter production and...