Articles by Author: F G Adriaanse

Search results for F G Adriaanse

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  1. Die rol wat nitraat: ammoniumverhoudings speel in die effektiewe benutting van stikstof by <em>Zea mays</em> L.

    Die rol wat nitraat: ammoniumverhoudings speel in die effektiewe benutting van stikstof by <em>Zea mays</em> L.

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Die invloed van verskillende nitraat: ammoniumverhoudings by sub- en supra-optimale stikstofkonsentrasies op die opname en benutting van stikstof is ondersoek. Effektiewe stikstofbenutting is in terme van saadopbrengs per eenheid opgeneemde stikstof gemeet. Die beste nitraat: ammoniumverhouding was 3:1 by 100...
  2. Invloed van nitraat:ammoniumverhoudings op die ontwikkeling van <em>Zea mays</em> L.

    Invloed van nitraat:ammoniumverhoudings op die ontwikkeling van <em>Zea mays</em> L.

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Die invloed van drie nitraat:ammoniumverhoudings by twee stikstofkonsentrasies op planteienskappe is met blomtyd en na fisiologiese volwassenheid vir suiwerlyne gemeet. 'n Kwartssandkultuur is as groeimedium in 'n glashuis gebruik. Toenemende NH4 +-verhoudings het planthoogtes, blaaroppervlaktes en droƫmateriaalproduksie van verskillende plantkomponente...
  3. Die relatiewe belang van die vorm en konsentrasie van stikstof in die wortelsone op die ontwikkeling van <em>Zea mays</em> L.

    Die relatiewe belang van die vorm en konsentrasie van stikstof in die wortelsone op die ontwikkeling van <em>Zea mays</em> L.

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Die invloed van ses nitraat:ammoniumverhoudings by 200 mg N l1 in een proef en twee ander verhoudings by 50, 100 en 200 mg N l1 in 'n tweede proef is op droƫmateriaalproduksie en stikstofinhoud ondersoek. Die algehele beste behandeling was...
  4. Nitrogen fertilizer guidelines for small-scale farming on an irrigated duplex soil based on soil analyses

    Nitrogen fertilizer guidelines for small-scale farming on an irrigated duplex soil based on soil analyses

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Reported nitrogen fertilizer research results were inadequate to meet the needs of small-scale farmers in the Bushbuck Ridge area. The objectives of this study were to establish inorganic N optima for maize production and to calibrate soil responses to N...
  5. Relationships between Ambic 1 and Bray 1 extractable phosphorus in some South African arable soils

    Relationships between Ambic 1 and Bray 1 extractable phosphorus in some South African arable soils

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    South African analytical laboratories use different extractants for P in soils of which the most important are Bray 1, Ambic 1, Bray 2, Truog and Olsen. The fertilizer industry prefers to use Bray 1 extractions for fertilization recommendations and the...
  6. Relationship between inorganic soil nitrogen and maize grain yield with controlled traffic practices

    Relationship between inorganic soil nitrogen and maize grain yield with controlled traffic practices

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Traditional N fertilizer guidelines were based on relationships between N application rates and yield response. These relationships varied greatly according to residual inorganic N content in the soil. The objective of this study was to establish inorganic N threshold values...
  7. Extractable soil phosphorus threshold values for dryland maize on the South African Highveld

    Extractable soil phosphorus threshold values for dryland maize on the South African Highveld

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The principle objective of this study was to establish P fertilizer guidelines for dryland maize on the South African Highveld according to the sufficiency concept of soil extractable P. Data sets from nine different P fertilizer trials at various localities...
  8. Causes of prematurity in the Bloemfontein Academic Complex

    Causes of prematurity in the Bloemfontein Academic Complex

    Item type: Journal Article • Journal: South African Family Practice
    Background: Prematurity is globally the leading cause of neonatal mortality, morbidity and long-term disability. The Millennium Development Goals (MDG) of the United Nations, and specifically MDG 4, address child mortality. Neonatal mortality rates contribute to 37% of all under-five mortality,...