Articles by Keyword: Phosphate

Search results for Phosphate

We found 19 results for you
  1. Factors Affecting Soil Phosphate Distribution and Reactions in Cape Forest Soils

    Item type: Journal Article • Journal: South African Forestry Journal
    The amounts of various forms of phosphate in some Cape soils and the adsorption of phosphate by these soils were investigated. The levels were low and only 2% was in available form. The major fraction of phosphate in the soil...
  2. Long term nitrogen and phosphorus application to veld

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The long term effects of a 5N x 3P factorial fertilizer application trial on hay yields, botanical composition and soil properties of veld are presented. Significant increases in hay yields were recorded during most years. There was a strong correlation...
  3. Fertilization of southern tall grassveld of natal: Effects on botanical composition and utilization under grazing

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The long‐term effects of nitrogen, phosphate and lime on change in botanical composition and utilization under grazing of Southern Tall Grassveld of Natal are presented. Nitrogen, phosphate, lime and type of nitrogen affected botanical composition significantly. Generally, fertilization had the...
  4. Habitat preferences of twenty‐three grass species in the Bankenveld

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Some grass species occur more frequently in certain habitats than in others. There is, however, uncertainty as to exactly which factors are responsible for this phenomenon. Species composition as well as habitat data were collected from plots situated on the...
  5. Response of subterranean clover to liming and phosphate fertilization on a low potassium soil

    Response of subterranean clover to liming and phosphate fertilization on a low potassium soil

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Several Trifolium varieties grown in an acid Bokkeveld shale soil responded positively to small additions of lime and P. Growth was probably limited by a K deficiency, and it is unlikely that Trifolium species could be successfully grown as cover...
  6. The influence of different P, NH<sup>+</sup>
               <sub>4</sub> and NO<sup>−</sup>
               <sub>3</sub> supply levels on the yield and P and Ca relationships in wheat

    The influence of different P, NH<sup>+</sup> <sub>4</sub> and NO<sup>−</sup> <sub>3</sub> supply levels on the yield and P and Ca relationships in wheat

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    In a water culture experiment with wheat, the influence on growth and nutrient uptake of varying the P supply from 0,02 to 5 mmol H2PO4 − dm−3 and the NH4 +:NO3 − ratio from 0:15 to 12:3, with a Hoagland...
  7. 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...
  8. 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...
  9. 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...
  10. Response of maize to ammonium nitrate, urea and cogranulated urea-urea phosphate

    Response of maize to ammonium nitrate, urea and cogranulated urea-urea phosphate

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Urea fertilizers may lose N by ammonia volatilization when applied in the field. In order to reduce this loss, modified urea compounds are being used. Not all of them reduce ammonia loss and improve crop yields. A field study was...