Articles by Author: Deanne Johnston

Search results for Deanne Johnston

We found 23 results for you
  1. Usage of antibiotics in the intensive care units of an academic tertiary-level hospital

    Usage of antibiotics in the intensive care units of an academic tertiary-level hospital

    Item type: Journal Article • Journal: Southern African Journal of Infectious Diseases
    Background: The post-antibiotic era is approaching fast as multidrug-resistant bacteria emerge and the antibiotic pipeline slows to a trickle. Antibiotic stewardship requires that antibiotics be used appropriately and as such this study reviewed the utilisation of antibiotics in five adult...
  2. Soil-water conservation as affected by primary tillage practices

    Soil-water conservation as affected by primary tillage practices

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    An investigation of water conservation as affected by different primary tillage methods was conducted on a soil of the Doveton series (fine-loamy, mixed, thermic family of Rhodic Paleudults), where a direct sampling technique was used to monitor the soil-water profiles...
  3. Soil-water conservation as affected by primary tillage practices

    Soil-water conservation as affected by primary tillage practices

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    An investigation of water conservation as affected by different primary tillage methods was conducted on a soil of the Doveton series (fine-loamy, mixed, thermic family of Rhodic Paleudults), where a direct sampling technique was used to monitor the soil-water profiles...
  4. Physical and clay mineralogical properties of some Natal and eastern Transvaal soils

    Physical and clay mineralogical properties of some Natal and eastern Transvaal soils

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Soils, collected from the south-eastern Transvaal, Natal north coast and the more arid areas of the Natal interior, were examined using physical, chemical and mineralogical methods. Most of the soils were associated with particular management problems such as poor internal...
  5. Quantities of phosphorus fertilizer required to raise the soil test value

    Quantities of phosphorus fertilizer required to raise the soil test value

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    To calculate nutrient requirement it is necessary to know how much of that nutrient must be applied to overcome any buffering effects and raise the test value to a desired level. A glasshouse study was conducted on a wide range...
  6. The effectiveness of Langebaan rock phosphate and superphosphate in two acid, phosphate-deficient soils

    The effectiveness of Langebaan rock phosphate and superphosphate in two acid, phosphate-deficient soils

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Acid, P-deficient soils with a large capacity to immobilize P favour the rapid decomposition of apatite. Such soils are widespread in the east of South Africa and the possibility exists that Langebaan rock phosphate (Langfos) may be a more cost-effective...
  7. Maize response to Langebaan rock phosphate—superphosphate mixtures under glasshouse conditions

    Maize response to Langebaan rock phosphate—superphosphate mixtures under glasshouse conditions

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A previous investigation showed that Langebaan rock phosphate (Langfos) was not an effective substitute for superphosphate. However, in the light of reports that P availability is enhanced when phosphate rock (PR) and monocalcium phosphate are combined, an improvement in Langfos...
  8. Assessment of phosphorus availability in soils fertilized with Langebaan rock phosphate or superphosphate

    Assessment of phosphorus availability in soils fertilized with Langebaan rock phosphate or superphosphate

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Problems currently exist in the interpretation of soil test values for soils fertilized with rock phosphate. This study was undertaken to compare the ability of four extradants (Ambic, Bray 1, Mehlich 3 and modified Truog) to assess plant available phosphorus...
  9. Phosphorus sorption in Natal soils

    Phosphorus sorption in Natal soils

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Phosphorus (P) sorption poses a severe constraint on the ability of many soils to supply adequate amounts of P to plants. In an effort to quantify the P sorption capacities of soils in Natal, P sorption isotherms of 50 topsoils...
  10. Calibration models for interpretation of soil salinity measurements using an electromagnetic induction technique

    Calibration models for interpretation of soil salinity measurements using an electromagnetic induction technique

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A commercially available salinity sensor (model EM-38 of Geonics Ltd., Canada) has been developed for diagnosing and quantifying soil salinity in the field. There is a need, however, to calibrate the instrument reading against a more commonly used measure of...