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- W2109155265 abstract "Evaporative cooling (EC) is an orchard practice used to decrease fruit temperature during the hottest part of the day. Fruit sunburn occurs easily when temperatures and light intensity are high, and this decreases packouts. EC has also been used successfully to improve colour of blushed apple and pear cultivars. The response of different apple and pear cultivars to EC was studied during 2003/2004 at Welgevallen Experimental Farm, Stellenbosch. EC was activated during the day at temperatures above 30C to reduce sunburn and between 18h00 and 21h00 at temperatures above 22C to improve colour development. Three treatments were evaluated: Control without EC, early application starting from the second week in December 2003, and late application starting 2 4 weeks before harvest, 2004. Experiments were done on two apple cultivars (‘Royal Gala’ and ‘Cripps’ Pink’) and two pear cultivars (‘Forelle’ and ‘Rosemarie’). Generally, fruit under EC had more sunburn than control fruit, due to failure of the system on a hot day. Underlying physiological responses of trees and fruit to EC were also investigated, particularly the phenomenon of acclimation and the potential for colour development and heat stress. In both apple cultivars a significant increase in fruit skin anthocyanin concentration and a decrease in phenolic content was found as the season progressed. In both pear cultivars there was a significant decrease in both anthocyanin and phenolic content. No significant differences were found in anthocyanin content between treatments in either the apple or pear cultivars. In both apple cultivars a higher phenolic content was found in the peel of the EC treatments. A decrease of up to four percent in leaf and fruit surface temperature was found under EC. No significant difference in trunk circumference was found in any of the cultivars. The late EC treatment in ‘Cripps’ Pink’ had a significantly faster rate of budbreak than the control and early EC treatments. Significantly higher stomatal conductance and transpiration was observed in leaves under EC. Knowledge about the various effects evaporative cooling and the subsequent lowering of ambient temperatures has on fruit trees and fruit could contribute greatly to producers’ ability to grow high quality fruit." @default.
- W2109155265 created "2016-06-24" @default.
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- W2109155265 date "2006-12-01" @default.
- W2109155265 modified "2023-09-26" @default.
- W2109155265 title "Evaporative cooling of apple and pear orchards" @default.
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