Articles by Author: John Wooldridge

Search results for John Wooldridge

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  1. Effects of soil surface management practices on soil and tree parameters in a ‘Cripps Pink’/M7 apple orchard 1. Mineral nutrition

    Effects of soil surface management practices on soil and tree parameters in a ‘Cripps Pink’/M7 apple orchard 1. Mineral nutrition

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Effects on soil, leaf and fruit element concentrations of organic (compost, straw mulch and hand weeding) and integrated (inorganic fertilisers and herbicide usage; IP) soil surface management practices in the tree rows, in combination with weed covers, cover crops and...
  2. Effects of soil surface management practices on soil and tree parameters in a ‘Cripps Pink’/M7 apple orchard 2. Tree performance and root distribution

    Effects of soil surface management practices on soil and tree parameters in a ‘Cripps Pink’/M7 apple orchard 2. Tree performance and root distribution

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Effects of integrated production (IP) and organic-acceptable soil surface management practices were investigated in a ‘Cripps Pink’/M7 apple orchard in the Elgin area, South Africa. Work row treatments included cover crops, weeds and straw mulch. In the IP tree rows,...
  3. Relationship between soil alteration index three (AI3), soil organic matter and tree performance in a ‘Cripps Pink’/M7 apple orchard

    Relationship between soil alteration index three (AI3), soil organic matter and tree performance in a ‘Cripps Pink’/M7 apple orchard

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Alteration index three (AI3), which calculates the balances between three microbially-secreted enzymes, potentially enables differences between soils due to contrasting management practices to be quantified in relative terms. The ability of AI3 to distinguish between apple orchard soils under conventional...
  4. Effect of organic and conventional practices on carbon-substrate utilisation by the soil microbial community in a ‘Cripps Pink’/M7 apple orchard

    Effect of organic and conventional practices on carbon-substrate utilisation by the soil microbial community in a ‘Cripps Pink’/M7 apple orchard

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Changes in microbial community metabolic profiles potentially can be used to identify differences in soil characteristics caused by dissimilar orchard floor management practices. The impacts of orchard floor management practices on the microbial community metabolic diversity (CMD) were examined in...
  5. Effect of conventional and organic orchard floor management practices on enzyme activities and microbial counts in a ‘Cripp's Pink’/M7 apple orchard

    Effect of conventional and organic orchard floor management practices on enzyme activities and microbial counts in a ‘Cripp's Pink’/M7 apple orchard

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Organic (ORG) production practices are increasingly being used in South African apple orchards. Whether ORG orchard floor management practices differ in their effects on soil enzyme activities and microbial populations from conventional (CON) practices have not been adequately investigated, particularly...
  6. Variation in urease and β-glucosidase activities with soil depth and root density in a ‘Cripp's Pink’/M7 apple orchard under conventional and organic management

    Variation in urease and β-glucosidase activities with soil depth and root density in a ‘Cripp's Pink’/M7 apple orchard under conventional and organic management

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The effects of conventional (CON; utilising synthetic fertiliser and herbicide) and organic (ORG; nutrients supplied in compost, weeds controlled with straw mulch) orchard floor management practices on depth-wise variation in urease and β-glucosidase activities in tree-row soils were compared in...
  7. The Use of Roots to Test N, P and K Deficiencies in <em>Eucalyptus</em> Nutrition

    Item type: Journal Article • Journal: South African Forestry Journal
    Bioassays have been developed which can provide diagnostics of the nutritional status of trees. They measure the flux of N, P or Rb for K into roots from standard solutions where the rate of influx is inversely related to nutrient...
  8. Postflexion and transforming larvae of <em>Gonorynchus gonorynchus</em> (Linnaeus, 1766)

    Postflexion and transforming larvae of <em>Gonorynchus gonorynchus</em> (Linnaeus, 1766)

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Postflexion larvae of Gonorynchus gonorynchus, previously undocumented, are described from the South-East Atlantic. Comparisons with descriptions of larval G. abbreviatus and larvae of another, still unidentified, species of Gonorynchus suggest slight to conspicuous differences in pigmentation between species.