Browsing by Author "Strauss, H. C."

Now showing 1 - 4 of 4
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    The effect of plant spacing on the water status of soil and grapevines
    (South African Society for Enology and Viticulture, 1989) Archer, E.; Strauss, H. C.
    The effect of plant spacing on soil water content and plant water status is described. The higher root densities of narrower plantings resulted in a more rapid depletion of soil water content. This resulted in a more negative leaf water potential which, in turn, resulted in earlier stomatal closure, affecting transpiration rate negatively. Consequently grapes from narrower spaced vines ripened under higher water stress conditions than those from wider spaced vines.
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    Effect of shading on the performance of vitis vinifera L. cv. cabernet sauvignon
    (South African Society for Enology and Viticulture, 1989) Archer, E.; Strauss, H. C.
    The effect of shading on the performance of Cabernet Sauvignon was studied. Significant different levels of canopy density were created using the growth of neighbouring vines, thus ensuring no artificial change in natural light composition. Light penetration in these canopies differed significantly between treatments. Berry mass, bunch mass and yield as well as skin colour were decreased with increasing levels of shading, while pH, K-concentration and TT A were increased. Tartaric acid decreased while malic acid increased with an increase in shading. Wine quality was negatively affected.
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    The effect of vine spacing on some physiological aspects of vitis vinifera L. (cv. pinot noir)
    (South African Society for Enology and Viticulture, 1990) Archer, E.; Strauss, H. C.
    The effect of vine spacing on leaf temperature, radiant energy, some canopy characteristics, leaf-water potential, stomata! conductance, the rate of transpiration and the rate of photosynthesis was measured and discussed. With more closely spaced vines, canopies were less dense than with more widely spaced vines mainly because of less vigorous shoot growth. The consequent better sunlight penetration favoured the physiology of more closely spaced vines early in the season. During the latter part of the season the situation was reversed and the physiology of more widely spaced vines was favoured mainly because of better water supply.
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    The effect of vine spacing on the vegetative and reproductive performance of vitis vinifera L. ( cv. Pinot noir)
    (South African Society for Enology and Viticulture, 1991) Archer, E.; Strauss, H. C.
    Data concerning growth, yield, grape composition and wine quality are presented for five years. Closer spacing reduced cane mass and yield per vine but increased them per hectare. Less dense canopies as well as a larger leaf area: fruit mass ratio with more closely spaced vines au~mented grafe and wine quality. Given the specific circumstances of this trial, a vine spacing resulting in between 1,0 m and 2,0 m soil surface per vine proved to be optimum for Pinot noir.