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The use of heat-sums to predict harvest dates following potassium chlorate (KClO3) application in longan.

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Diczbalis, Y. and Drinnan, J. (2010) The use of heat-sums to predict harvest dates following potassium chlorate (KClO3) application in longan. Acta Horticulturae, 863 . pp. 345-350. ISSN 0567-7572

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Article Link: https://doi.org/10.17660/ActaHortic.2010.863.45

Publisher URL: https://www.actahort.org/books/863/863_45.htm


The ability to initiate and manipulate flowering with KClO3 allows flowering of longan, to be triggered outside of the normal flowering season (July-September) in Australia. Fruit maturity following normal flowering will occur approximately six-eight months (180-220 days) from flowering, depending on variety. Out of season flowering will result in differing times to maturity due to different temperature regimes during the maturity period. Knowing how long fruit will take to mature from different KClO3 application dates is potentially a valuable tool for growers to use as it would allow them to time their applications with market opportunities, e.g. Chinese New Year, periods of low volumes or periods of high prices. A simple heat-sum calculation was shown to reliably quantify fruit maturity periods, 2902 and 3432 growing degree days for Kohala and Biew Kiew respectively. Growers can use heat-sum as a predictive tool to allow for efficient planning of harvesting, packaging and freight requirements.

Item Type:Article
Business groups:Horticulture and Forestry Science
Keywords:Application date; flowering; fruits; harvesting date; heat; heat sums; Dimocarpus longan var. longan; longans; maturity; maturity stage; temperature relations; packaging.
Subjects:Agriculture > Agriculture (General) > Fertilisers
Plant culture > Harvesting, curing, storage
Plant culture > Fruit and fruit culture > Culture of individual fruits or types of fruit
Live Archive:07 Feb 2011 00:25
Last Modified:17 Jan 2023 04:06

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