Browsing by Author "Van Tonder, Catherina Susara Magdelena"
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- ItemDie effek van plantgroeireguleerders op vrugontwikkeling van buite-seisoen kweekhuistamaties(Stellenbosch : Stellenbosch University, 1997) Van Tonder, Catherina Susara Magdelena; Stellenbosch University. Faculty of AgriSciences. Dept. of Agricultural Economics.ENGLISH ABSTRACT: The yield of greenhouse tomatoes produced out-of-season or during unfavourable environmental conditions is usually poor. Short photoperiod, low light intensities and low temperatures limit photosynthesis and therefore the production of carbohydrates, essential for the production of viable pollen. High temperatures contribute to deviations in flower morphology like splitting of the anther cone and style exsertion which therefore results in poor pollen transfer and low fruit set. Inadequate pollination results in seedless (Partenocarpic) fruit development with non-marketable sizes and shapes. Truss-vibration with an electric truss-vibrator is successfully used in greenhouses to enhance pollen transfer and pollination. However, truss-vibration is labour intensive and may increase the chance of damage to flowers. Therefore chemical manipulation of fruit development with plant growth regulators (PGR) offers an useful alternative.