Articles by Keyword: Nitrate Ammonium Ratio

Search results for Nitrate Ammonium Ratio

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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 droëmateriaalproduksie 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 droëmateriaalproduksie en stikstofinhoud ondersoek. Die algehele beste behandeling was...
  4. The effects of N-source, shading and root zone cooling on two <em>Disa</em> hybrids

    The effects of N-source, shading and root zone cooling on two <em>Disa</em> hybrids

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Although the Disa genus contains more than 130 species, the most commonly grown is Disa unifiora and its hybrids. The evergreen Disas are indigenous to South Africa and have great potential for marketing as cut flowers or pot plants but...
  5. The effect of nitrogen on the development and photosynthetic activity of <em>digitaria eriantha</em> steud. subsp. <em>eriantha</em>

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Digitaria eriantha Steud. subsp. eriantha, plants were grown under controlled conditions and treated with different concentrations and forms of nitrogen. The plants showed a preference for nitrate nitrogen, as opposed to ammonium nitrogen, with greater total dry matter production and...
  6. The influence of different forms and concentrations of nitrogen on the growth and metabolism of <em>digitaria eriantha</em> and <em>chloris Gayana</em> grown under saline conditions

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Chloris gayana and Digitaria eriantha plants were watered with nutrient media containing a high concentration of sodium chloride (150 mM) and either high (200 mg/l) or low (25 mg/l) concentrations of nitrate nitrogen and ammonium nitrogen. Dry mass and leaf...
  7. The effect of form and level of nitrogen fertlization on the yield of <em>Digitaria eriantha</em> Steud*

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    On dryland Digitaria eriantha ammonium sulphate and limestone ammonium nitrate were superior to potassium nitrate and urea. With reference to the level of nitrogen fertilization it was found that levels in excess of 300 kg N/ha, and up to 400...
  8. The influence of nitrate and ammonium forms of nitrogen fertilizer on the growth and osmoregulation of <em>digitaria eriantha</em> and <em>Chloris gayana</em> grown under saline conditions

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Digltaria eriantha and Chloris gayana were grown under controlled conditions for three months and were treated with a nutrient solution containing 150 mMol NaCl and the following nitrogen sources: 25 or 200 mg/l NH4 +‐N or NO3 −‐N or no...
  9. The effect of source of nitrogen on the dry matter yield, nitrogen and nitrate‐N content of <em>Lolium multiflorum</em>

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Three sources of N fertilizer (urea, limestone ammonium nitrate (LAN) and ammonium sulphate) showed no consistent significant trends in terms of the dry matter yield and nitrogen or nitrate‐N content of midmar ryegrass. Ammonium sulphate was found to acidify the...
  10. A vacuum filtration and leaching method for the colorimetric determination of ammonium and nitrate nitrogen in soils

    A vacuum filtration and leaching method for the colorimetric determination of ammonium and nitrate nitrogen in soils

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The extracting solution and soil were separated by using vacuum filtration, followed by continuous leaching. The procedure was evaluated by spiking five different topsoil samples (having a wide range of physical and chemical properties) with ammonium nitrate and determining the...