Articles by Author: H F Visser

Search results for H F Visser

We found 69 results for you
  1. The Effects of Nitroacta (Urea formaldehyde) on the Survival and Growth of <em>Pinus elliottii</em>

    Item type: Journal Article • Journal: South African Forestry Journal
    A pot trial testing the effect of no nitrogen, one level of urea and three levels of urea formaldehyde (Nitroacta) on the survival and growth of Pinus elliottii Engelm. is described. Survival, shoot increment, root/shoot ratio and mycorrhizal infection were...
  2. Bookreviews

    Bookreviews

    Item type: Journal Article • Journal: South African Journal of African Languages
  3. Screening for DIMBOA (benzoxazinone) concentration among South African inbred maize lines and sorghum cultivars

    Screening for DIMBOA (benzoxazinone) concentration among South African inbred maize lines and sorghum cultivars

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Twenty-seven popular South African inbred maize lines, four commercial maize cultivars, two sweet corn cultivars and two grain sorghum cultivars were screened by means of a rapid, semi-quantitative method to determine DIMBOA concentration. Significant differences were found between inbred lines...
  4. Growth responses of inbred maize lines with high and low DIMBOA (benzoxazinone) contents to atrazine

    Growth responses of inbred maize lines with high and low DIMBOA (benzoxazinone) contents to atrazine

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The growth response of five inbred maize lines with high and low DIMBOA content were compared in the presence of 3 and 12 ppm atrazine. A growth-promoting effect of atrazine on roots, mesocotyls and coleoptiles was observed in dark-grown seedlings...
  5. Ultrastructural changes in the leaves of <em>Zea mays</em> L. plants treated with atrazine

    Ultrastructural changes in the leaves of <em>Zea mays</em> L. plants treated with atrazine

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Veinal chlorosis was induced in the lower leaves of young maize plants following treatment with atrazine (2-chloro-4-ethylamino-6- isopropylamino-s-triazine). An ultrastructural investigation indicated that mesophyll chloroplasts, consisting of grana, thylakoids and stroma showed severe disintegration. The seemingly unaffected bundle sheath chloroplasts...
  6. Qualitative estimation of atrazine, hydroxyatrazine and 6-methoxy-2-benzoxazinone (MBOA) in maize plants

    Qualitative estimation of atrazine, hydroxyatrazine and 6-methoxy-2-benzoxazinone (MBOA) in maize plants

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A rapid and simple method for the extraction and quantification of the herbicide atrazine, the atrazine hydroxylating agent in maize plants DIMBOA, and the hydroxylated product hydroxy-atrazine, is described. These substances were quantified by means of HPLC techniques, employing a...
  7. <em>In vivo</em> atrazine hydroxylation in maize plants exposed to five different temperature regimes

    <em>In vivo</em> atrazine hydroxylation in maize plants exposed to five different temperature regimes

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Maize plants exposed to atrazine at temperatures ranging from 10°C to 30°C showed increased hydroxylation of atrazine to form the non-toxic hydroxy-atrazine metabolite as temperature increased to 25°C, above which hydroxylation decreased again. When exposed to 12 ppm atrazine, accumulation...
  8. Atrazine metabolism in field-grown maize and the effect of atrazine phototoxicity on yield

    Atrazine metabolism in field-grown maize and the effect of atrazine phototoxicity on yield

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Maize was grown under field conditions, applying conventional farming practices. Atrazine was sprayed pre- emergence at concentrations of 1,25 I ha−1ai. and 5 I ha−1ai. Severe phytotoxicity symptoms were visible from the first- to about the sixth-leaf stage i.e. 25–30...