Articles by Author: La Denny

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  1. The Effects of Five Herbicides on <em>Pinus patula</em> Saplings when Applied “Over-the-top” for Woody Weed Control

    Item type: Journal Article • Journal: South African Forestry Journal
    Five herbicides were applied over-the-top to Pinus patula saplings to determine which ones are tolerated by pines. At concentrations adequate for woody weed suppression, clopyralid and metsulfuron methyl were found most promising; glyphosate, fosamine-ammonium and triclopyr ester resulted in excessive...
  2. Variable Effects of Glyphosate and Triclopyr Used for the Control of American Bramble, <em>Rubus cuneifolius</em> agg, in Pine Plantations

    Item type: Journal Article • Journal: South African Forestry Journal
    American bramble, Rubus cuneifolius agg, is a weed in pine plantations but information about the efficacy and long-term effects of herbicides is limited. Two trials are described in which observations continued for five and three years respectively. In the first...
  3. Herbicide treatments applied to stems and stumps of bugweed, <em>Solanum mauritianum</em>

    Item type: Journal Article • Journal: South African Forestry Journal
    Herbicide treatments applied to stems and stumps are necessary for bugweed, Solanum mauritianum, Scop because it is not always possible to spray the aerial parts when the plants are at an ideal height. Triclopyr in diesel and 2,4-D:2,4-DP ready-to-use were...
  4. Some effects of varying the duration, frequency and intensity of grazing on the growth of steers on veld

    Some effects of varying the duration, frequency and intensity of grazing on the growth of steers on veld

    In a grazing trial on open granite sandveld near Bulawayo, Rhodesia, three periods of stay in a paddock, namely, 5, 10 and 20 days, are being used in all combinations with 4 and 8 paddock units to give a range...
  5. A comparison of continuous and rotational grazing on veld at two stocking rates

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Two rotational grazing procedures, a four‐paddock system with a 10‐day period of stay and an eight‐paddock system with a 5‐day period of stay, were compared with continuous grazing on veld. The trial was conducted 40 km south of Bulawayo in...
  6. Biology, natural selection and the prediction of maximal wave-induced forces

    Biology, natural selection and the prediction of maximal wave-induced forces

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Appropriate interpretation of body form often requires knowledge regarding the maximal force that an organism is likely to encounter in its lifetime. In many situations, prediction of maximal forces is nearly impossible, but the statistical distribution of ocean waves allows...
  7. The response of <em>Cyperus papyrus</em> (L.) and <em>Miscanthidium violaceum</em> (K. Schum.) Robyns to eutrophication in natural wetlands of Lake Victoria, Uganda

    The response of <em>Cyperus papyrus</em> (L.) and <em>Miscanthidium violaceum</em> (K. Schum.) Robyns to eutrophication in natural wetlands of Lake Victoria, Uganda

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Interrelationships between nutrient concentrations and aerial biomass, root numbers, length and rhizomes size in Cyperus papyrus (L.) (papyrus) and Miscanthidium violaceum (K. Schum.) Robyns (synonymous to Miscanthus violaceus (K. Schum) Pilg.) were established in five different wetlands around the northern...
  8. Environmental impact of seasonal integrated aquaculture ponds ('fingerponds') in the wetlands of Lake Victoria, Kenya: an assessment, with the aid of Bayesian Networks

    Environmental impact of seasonal integrated aquaculture ponds ('fingerponds') in the wetlands of Lake Victoria, Kenya: an assessment, with the aid of Bayesian Networks

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The potential effect on ecosystem integrity of the use of natural wetlands for seasonal wetland fishponds ('fingerponds'), integrated with vegetable production for livelihood demands, was evaluated using experimental sites at Lake Victoria, Kenya. Soluble reactive phosphorous and total phosphorus, ammonium,...