Articles by Author: J B Mallett

Search results for J B Mallett

We found 10 results for you
  1. Effect of the amount of surface maize residue on infiltration and soil loss from a clay loam soil

    Effect of the amount of surface maize residue on infiltration and soil loss from a clay loam soil

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Six levels of maize stover, expressed as percentage ground cover (0–75%) were compared under a rainfall simulator to assess the effect of surface residues on infiltration and soil loss on a clay loam soil with a 3,5% slope. Increasing the...
  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. Water storage, soil temperatures and maize (<em>Zea mays</em> L.) growth for various tillage practices

    Water storage, soil temperatures and maize (<em>Zea mays</em> L.) growth for various tillage practices

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Four tillage treatments ranging from conventional mouldboard ploughing through to direct-drilling were repeated during the second season of an ongoing experiment. At commencement of the new season, differences in plant- available water (PAW) in the top 600 mm of the...
  5. The effect of tillage system and rate and time of nitrogen application on maize performance on a sandy Avalon soil

    The effect of tillage system and rate and time of nitrogen application on maize performance on a sandy Avalon soil

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Four nitrogen fertilizer regimes were superimposed on a tillage trial on a sandy Avalon soil at Dundee in 1985 in order to investigate whether the rate and time of N fertilizer application influenced the poor early-season growth and reduced yields...
  6. Preliminary evaluation of two maize (<em>Zea mays</em> L.) growth-simulation models

    Preliminary evaluation of two maize (<em>Zea mays</em> L.) growth-simulation models

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Two maize growth-simulation models developed in the U.S.A., CERES-Malze and CORNF, were evaluated with South African data using graphical and numerical techniques. The results indicate that both models agree well with observed values of total above-ground plant dry mass, leaf...
  7. Changes in a Doveton clay loam after 12 years of direct-drill maize production

    Changes in a Doveton clay loam after 12 years of direct-drill maize production

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    After 8 years of direct-drill maize production at Cedara on a Hutton/Doveton clay loam (Typic Plinthustult) it was found that the top 120-mm layer had become somewhat denser and that organic carbon levels in the top 20 mm were higher...
  8. Typifying late-season weather for maize yield prediction

    Typifying late-season weather for maize yield prediction

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Long-term weather data were used to generate typical weather records. By substituting typical weather data for actual late-season weather data it was possible to compute yield predictions using the model CERES-Maize, and compare these with predictions based on full season...
  9. The effect of tillage: maize residue interactions upon soil water storage

    The effect of tillage: maize residue interactions upon soil water storage

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Four months before planting a crop of maize, a study was commenced on a well-drained clay loam soil to test the effect of tillage and surface maize residue on soil water storage. Tillage main plots were split into bare (residue...
  10. The effect of removing maize surface residue from the seed-row on seedzone temperature, soil water and maize development

    The effect of removing maize surface residue from the seed-row on seedzone temperature, soil water and maize development

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Early maize development is generally less rapid in the cooler soils of tillage systems which maintain large amounts of crop residues (stubble) on the soil surface. However, soil water storage tends to increase with increasing amount of surface cover, and...