Articles

The effect of evaporative cooling on yield and flower bud retention during spring on pistachio cultivar ‘Ariyeh’ (Pistacia vera L.) in a climate with moderate winter chilling and high spring temperatures

Article number
1346_11
Pages
83 – 90
Language
English
Abstract
Evaporative cooling of pistachio cultivar ‘Ariyeh’ (Pistacia vera L.) was used to counteract potential negative effects of high maximum day temperatures during autumn and spring on flower bud retention, fruit set, and yield in Prieska (29°40’S, 22° 45’E, 945 m a.s.l.), South Africa.
Cooling during autumn (May + June, Southern hemisphere), spring (August + September, Southern hemisphere), and the combination of autumn + spring were investigated during two seasons.
Flower bud retention during winter and early summer, flowering pattern, as well as yield, were evaluated.
The autumn cooling treatment flowered consistently first and spring cooling last.
Cooling effects on flower bud retention were only found during and after anthesis.
Autumn + spring cooling resulted in commercial yields for ‘Ariyeh’. The improved yield obtained indicates the important role of climatic conditions during entering and exiting endodormancy of pistachio nut trees.
Although some effects obtained are not easy to explain, the fact that evaporative cooling resulted in substantial yields in an area with sub-optimal pre-blossom temperatures and less than 40% of the required winter chill of pistachios emphasized its potential in orchard management.

Publication
Authors
A.M. Müller, K.I. Theron
Keywords
bud break, evaporative cooling, marginal climate, pistachio, spring temperature
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