Volume 61 Number 4 Article 26 Pages: 174-178
Year 2007 Month 10
Title: Hail Net Effect on Photosynthetic Rate and Fruit Color Development of 'Starkrimson' Apple Trees
Authors: A. Romo-Chacon, J.A. Orozco-Avitia, A.A. Gardea, V. Guerrero-Prieto and J.M. Soto-Parra
Citation
Abstract:
Photosynthetically active radiation (PAR) distribution, net photosynthesis (Pn) and fruit color were measured
on ‘Starkrimson Delicious’ apple (Malus × domestica Borkh.) trees and fruits protected against hail by white or
black nets, as well as unprotected controls.
PAR levels were reduced by 45 and 63% by white and black nets respectively.
Net color and canopy position showed a highly significant interaction for PAR distribution.
The inner
canopy of trees under black hail nets received the least PAR. PAR measured in the upper canopy was significantly
higher than in the lower canopy.
No significant differences in Pn were found between trees under white nets and
controls, but both were higher than trees under black nets.
Highly significant differences were found for canopy
position; the lower-internal canopy position yielded the lowest Pn values.
Fruit color followed the same pattern of
influence of canopy position and orientation.
Fruit color measurements L-value and hue angle (°h) were directly
affected by hail nets.
Fruits in the upper tree stratum had better color, with lower L and °h values.
Fruit color was
mostly defined by fruit position within the canopy.
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