In this article:
Two shading experiments on the Sultana are described. In the main experiment light intensity was reduced by approximately 70% for different lengths of time between October and January.
During shading bunch weight was reduced and in the second experiment shades in position for the longer periods of time reduced berry size and yield.
In the season following fruitfulness and yields were severely depressed where light intensity had been reduced by 70% for at least four weeks between early November and mid-December.
It is concluded that light intensity is an important factor for fruit bud formation in the sultana; reduction of light is inhibitory, but only during the period of inflorescence initiation.
The effect of shading on fruitfulness and yield in the sultana
1963, Journal of Horticultural Science, vol 38, pages 85 – 94
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