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Effects of photo-selective nets on tomato (Solanum lycopersicum) plant growth and fruit quality at harvest.Tinyane, PhushudI Peter. January 2013 (has links)
M. Tech. Agriculture. / Investigates the effect of photo-selective nets on plant growth parameters (plant height, leaf area, leaf chlorophyll, stem diameter, flowering intensity, and fruit settings), pest and disease incidence, and yield (number of fruits per plant) in three selected cultivars.Secondly, to investigate the effect of shading on fruit quality parameters (fruit mass, firmness, colour, soluble solids content, and titratable acidity) and health promoting compounds (ascorbic acid, lycopene content, β-carotene, total phenols and flavonoids, and antioxidant scavenging activity) in three selected tomato cultivars.
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The effect of calcium chloride postharvest dips and concentrations of the improvement of storage and shelf-life of 'classic round' tomatoes (solanum lycopersicum, L.)Matsunyane, Keitumetse Delician January 2022 (has links)
Thesis (M.Sc. (Horticulture)) -- University of Limpopo, 2017 / Tomato is popularly consumed as fresh vegetable or processed product due to its
nutritional and health benefits. However, due to its high perishability, tomato cannot
be stored for longer duration. Therefore, the aim of this study was the determination
of appropriate dipping times into different calcium chloride concentrations to
preserve the postharvest quality, storage and the shelf-life of tomato fruit. 'Classic
round' tomato fruit were harvested at their pink maturity stage. The experiment was
carried out as a completely randomized design (CRD), factorial arranged as 4 × 3 ×
8. Treatment factors were: 4 × CaCl2 (0, 0.0045, 0.01 and 0.03%), 3 × dipping times
(0, 30 and 60 minutes) and 8 × shelf-life (0 - 7 days). Fruit were stored at 15⁰ C for
30 days, thereafter, held under room temperature for 0 - 7 days of shelf-life while
collecting data. During shelf-life period, fruit were evaluated for weight loss, firmness,
colour, TSS, TA, pH, physiological and pathological disorders. The interaction
between the treatments and dipping times showed a significant effect on weight loss,
firmness, colour parameters [L*, b*, chroma and hue angle (⁰)], total soluble solids
(TSS), titratable acidity (TA), pH, decay and black mould occurrence. However,
significant interactive effects were not shown on a* colour component and chilling
injury. In conclusion, calcium chloride (CaCl2) improved the quality and shelf-life of
'Classic round' tomato fruit. Calcium chloride concentration 0.01% was effective at
30 minutes dipping time, meanwhile, 0.03% CaCl2 was effective at 60 minutes
dipping time. Therefore, 0.01 and 0.03% can be recommended for commercial
preservation use for tomato fruit quality and shelf-life. / Agricultural Research Council-Tropical and Subtropical Crops (ARC-TSC) and
National Research Foundation (NRF)
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Influence of bagging materials on maturity indices and post-harvest quality of 'roma vf' and 'tinker' cherry tomatoesMafotja, Mokgadi Pollet January 2022 (has links)
Thesis (M.Sc. (Horticulture)) -- University of Limpopo, 2022 / The purpose of this study was to assess the impact of pre-harvest bagging materials
on maturity indices and post-harvest quality of cherry tomatoes. At pre-harvest, fruit
were bagged with blue and transparent plastic bags of 0.075- and 0.025-mm
thickness, respectively. The non-bagged fruit were considered as control treatment.
The experiment was carried out in a randomized complete block design arranged in
a 2 × 3 factorial arrangement with three replications. Physical quality parameters
such as; colour changes (L*, a*, b*, C*, h˚, and ΔE), firmness, weight loss and size
were assessed. Physico-chemical parameters such as pH, total soluble solids, and
total titratable acidity were also evaluated. Bagging had a significant effect on the
quality of both cherry tomato cultivars. The results showed that bagging cherry
tomatoes at 1.5 cm diameter with blue and transparent plastic bags accelerated
maturity. Moreover, bagging with transparent plastic bags enhanced exocarp colour,
reduced weight loss, retained larger size, increased pH and TTA, with an increase in
TSS when compared with blue plastic bags and control, respectively at 12 days of
shelf-life. In conclusion, the findings demonstrate that pre-harvest bagging has the
potential to improve maturity indices and post-harvest quality of cherry tomatoes.
Therefore, pre-harvest bagging can be used as an alternative method to enhance
cherry tomato fruit quality and shelf-life. / NRF
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