New Zealand Journal of Crop and Horticultural Science abstracts

Model of the effects of a range of shelter orientations on shading patterns in kiwifruit (Actinidia sp.) blocks

J. Zhang¹

Agriculture New Zealand
Private Bag 9024
Hastings, New Zealand

S. Scarrow²
H. T. Barnes³

Agriculture New Zealand
P.O. Box 792
Tauranga, New Zealand

Present addresses: ¹Pistachio Growers Association Incorporated, RMB 2579, Robinvale, VIC 3549, Australia. ²Fruition Horticulture, P.O. Box 792, Tauranga, New Zealand. ³New Zealand Vegetable and Potato Growers Federation, P.O. Box 10 232, Wellington, New Zealand.

Abstract Although shelterbelts in kiwifruit (Actinidia sp.) orchards reduce the negative effects of wind, they reduce the direct sunlight received. The shadow lengths of shelters 10 m taller than the kiwifruit canopy in theoretical blocks (150 x 50 m) orientated in 10° intervals from 0° (north-south) to 90° (east-west) were calculated at every minute for New Zealand locations. These shadow lengths allowed calculation of sunlight duration at each of 6439 transect points across the 0.6 ha canopy blocks. From these the average sunshine minutes of blocks were compared on a number of dates for various shelter orientations and locations. Contour maps displayed the variation in sunshine duration received across blocks at Tauranga in December, March, and June. There appears to be no obvious disadvantage of shelter orientations of 10°-40° compared with 0° (north-south). Lack of sunlight uniformity in blocks is discussed in relation to potential for fruit segregation at harvest.

Keywords kiwifruit; Actinidia; shelter; orientation; sun; shadow; wind; model

H03044; Online publication date 11 November 2004 Received 30 April 2003; accepted 30 August 2004
New Zealand Journal of Crop and Horticultural Science, 2004, Vol. 32: 407-417
0014-0671/04/3204-0407 $7.00 © The Royal Society of New Zealand 2004

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New Zealand Journal of Crop and Horticultural Science abstracts

Model of the effects of a range of shelter orientations on shading patterns in kiwifruit (Actinidia sp.) blocks

J. Zhang1

Agriculture New Zealand Private Bag 9024 Hastings, New Zealand

S. Scarrow2 H. T. Barnes3

Agriculture New Zealand P.O. Box 792 Tauranga, New Zealand

Present addresses: 1Pistachio Growers Association Incorporated, RMB 2579, Robinvale, VIC 3549, Australia. 2Fruition Horticulture, P.O. Box 792, Tauranga, New Zealand. 3New Zealand Vegetable and Potato Growers Federation, P.O. Box 10 232, Wellington, New Zealand.

J. Zhang¹

Agriculture New Zealand
Private Bag 9024
Hastings, New Zealand

S. Scarrow²
H. T. Barnes³

Agriculture New Zealand
P.O. Box 792
Tauranga, New Zealand

Present addresses: ¹Pistachio Growers Association Incorporated, RMB 2579, Robinvale, VIC 3549, Australia. ²Fruition Horticulture, P.O. Box 792, Tauranga, New Zealand. ³New Zealand Vegetable and Potato Growers Federation, P.O. Box 10 232, Wellington, New Zealand.