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This lack of red colouration or consumer appeal was caused by decreased PAR transmission essential for fruit colouration ( (Arakawa et al., 1985),especially in the case of greeneblack and redeblack hailnets containing two black fibres in their structure (Fig. 2).Vice versa, fruits from apple trees under the coloured hailnetsdeveloped a greener ground colour with lower a and higherb values as well as larger hue values (‘Fuji’ 86 to 99 hue, ‘Pinova’78 to 92 hue, greeneyellow) than unprotected fruit with 59hueand 61hue for the same reason as the red top colour. In terms offruit quality, the coloured hailnets improved green (ground) colour,but hampered some of the red (top) colour of the apple fruit.Overall, (red) top and (green) ground colour of the apple fruit and hence consumer appeal were not only influenced by the hailnetcolour, but also by the number of black or white fibres in therespective coloured hailnet with increasing numbers of black fibresreducing the light. This is in line with fruit quality results fromapple under white or black hailnets of e.g.
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