|Author:||Nuruddin, M. M. ; Madramootoo, C. A. ; Dodds, G. T.|
|Book Group Author:||NA|
Tomatoes (cv. Sunstart) were grown in a greenhouse. Two available soil water (ASW) deficit thresholds, 65 and 80%, at which plants were irrigated to field capacity were factorially combined with five irrigation timing patterns: (1) no water stress; (2) stress throughout the entire growing season; (3) stress during first cluster flowering and fruit set; (4) stress during first cluster fruit growth; and (5) stress during first cluster fruit ripening. Crop yields, water use efficiency, including maximum and minimum equatorial fruit diameters and fruit height were measured. Quality parameters of soluble solids, pH, and fruit colour were also measured. Water stress throughout the growing season significantly reduced yield and fruit size, but plants stressed only during flowering showed fewer but bigger fruits than completely non-stressed plants. Consequently, on a weight basis, the stressed at flowering and non-stressed plants had similar yields. Non-stressed and flowering-stressed fruits showed lower soluble solids and a lighter colour of red ripe fruit than the other stress treatments. There were no significant differences in yield or quality between the two stress levels (65 vs. 80% ASW depletion before irrigation). Water stress only during flowering resulted in better yields and quality than stress at other specific developmental stages or at all times, but equal or poorer yields and water use efficiency than non-stressed plants.
|Pages:||1389 - 1393|
colour, crop growth stage, crop quality, crop yield,flowering, fruit set, fruits, growth, irrigation, pH, plant development,plant water relations, protected cultivation, ripening, tomatoes, waterstress, water use efficiency, Lycopersicon esculentum, Lycopersicon,Solanaceae, Solanales, dicotyledons, angiosperms, Spermatophyta, plants,eukaryotes, anthesis, color, cultivation under glass or plastic,hydrogen ion concentration, potential of hydrogen, watering,Horticultural Crops (FF003) (New March 2000), Plant Physiology andBiochemistry (FF060), Plant Water Relations (FF062), Plant Production(FF100), Soil Water Management (Irrigation and Drainage) (JJ800)(Revised June 2002) [formerly Soil Water Management], Crop Produce(QQ050), Food Composition and Quality (QQ500)