Articles by Keyword: Wetting And Drying

Search results for Wetting And Drying

We found 10 results for you
  1. Changes in soil aggregate stability during simulated weather cycles

    Changes in soil aggregate stability during simulated weather cycles

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The effects of wetting and drying, and freezing and thawing on the stability of aggregates produced by laboratory manipulation or field tillage were studied on two British soils. Changes in aggregate stability were assessed by turbidimetry, with some information from...
  2. Production Capacity of Softwood Sawmills in the Republic of South Africa, Swaziland and Transkei

    Item type: Journal Article • Journal: South African Forestry Journal
    The technical and practical capacities of softwood sawmills and boxmills in the Republics of South Africa, Transkei and Ciskei and the Kingdom of Swaziland were estimated as at 30 June 1987. These estimates show that sawmills in Southern Africa are...
  3. Use of the microwave oven for drying herbage samples in the field

    Use of the microwave oven for drying herbage samples in the field

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Drying of herbage samples in the field using a microwave oven powered by a portable generator has saved time and eliminated the transporting of samples to other stations for handling. Microwave drying is compared to drying in conventional forced-air ovens...
  4. Evaluation of the effects of scorching caused by the directed application of a paraquat-containing herbicide mixture to the base of maize plants at various ages

    Evaluation of the effects of scorching caused by the directed application of a paraquat-containing herbicide mixture to the base of maize plants at various ages

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The effect of herbicides which scorched the lower leaves of maize was compared in three seasons. The first season was relatively dry whilst the other two were wetter seasons. A mixture of cyanazine + atrazine + paraquat + a wetting...
  5. 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...
  6. The effect of oven-drying on residual inorganic nitrogen in soils

    The effect of oven-drying on residual inorganic nitrogen in soils

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Residual ammonium nitrogen in soils which were dried in an oven increased, whereas residual nitrate nitrogen remained almost constant. This observation led to experiments which help to explain the accumulation of ammonium nitrogen in oven-dried soils. It was found that...
  7. CRITICAL POINT DRYING AS A PREPARATIVE TECHNIQUE FOR SCANNING ELECTRON MICROSCOPY AND ITS APPLICATION IN LIMNOLOGY

    CRITICAL POINT DRYING AS A PREPARATIVE TECHNIQUE FOR SCANNING ELECTRON MICROSCOPY AND ITS APPLICATION IN LIMNOLOGY

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The preservation technique of critical point drying for use with the scanning electron microscope is described. A study of the periphyton community development on the aquatic macrophyte, Potamogeton pectinatus L. from the littoral zone of Swartvlei, southern Cape Province, is...
  8. Effect of different herbage preservation methods on the tannin levels monitored in <em>Eulalia villosa</em> Thunb. (Nees)

    Effect of different herbage preservation methods on the tannin levels monitored in <em>Eulalia villosa</em> Thunb. (Nees)

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Tannin concentrations in freeze‐, oven‐ and room‐temperature‐dried samples of leaves of Eulalia villosa Thunb. (Nees), as well as undried material stored at ‐70°C, were determined in order to compare the effect of different preservation methods on the tannin levels measured...
  9. Aggregate breakdown mechanisms as affected by soil texture and organic matter in soils dominated by primary minerals

    Aggregate breakdown mechanisms as affected by soil texture and organic matter in soils dominated by primary minerals

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Soil aggregates breakdown mechanisms depend on soil properties such as texture, clay mineralogy and organic matter content. Little is known about the effect of soil properties on aggregate breakdown mechanisms in South African soils. The objective of this study was...
  10. Tillage and crop rotation effects on carbon sequestration and aggregate stability in two contrasting soils at the Zanyokwe Irrigation Scheme, Eastern Cape province, South Africa

    Tillage and crop rotation effects on carbon sequestration and aggregate stability in two contrasting soils at the Zanyokwe Irrigation Scheme, Eastern Cape province, South Africa

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Intensive tillage and monocropping have adversely affected the quality of soils in South Africa through accelerated loss of soil organic matter. Two clay loam soils, a Bonheim at Burnshill and a Shortlands at Lenye, at the Zanyokwe Irrigation Scheme in...