Measurement of Light Interception by Navel Orange Orchard Canopies: Case Study of Lindsay, California
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Volume 132, Issue 1
Abstract
Photosynthetically active radiation (PAR) intercepted by orange orchards (Frost Nucellar navel) having different canopy sizes was measured to determine the relationships with crop coefficient ( and ) values and crop evapotranspiration (ET) . Three separate experiments were carried out near Lindsay, Calif. during the months of July and August 2004 to compute the fraction of light PAR intercepted by mature and immature orange orchards. Periodic readings of PAR data were compared with near simultaneous measurements of net radiation , heat transfer through exposed flux plates , and incident total solar radiation . The PAR data were used to calculate canopy light interception and the results were compared with those computed from the and data. The other sensors were studied as possible substitutes for the more expensive PAR light bar. Light interception by the different canopies was related to crop coefficient ( and ) values that were determined by micrometeorological measurement of and Penman–Monteith reference evapotranspiration and .
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Acknowledgments
The writers thank the California Citrus Research Board for supporting this research. We give special thanks to Sun Pacific for letting us study their orchard for several years. We also want to thank Don Roark and Martin Mittman for permission to conduct research in their orchards during this experiment. In addition, we are grateful to University of Catania for supporting Dr. S. Consoli during her work in California.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 132 • Issue 1 • February 2006
Pages: 9 - 20
Copyright
© 2006 ASCE.
History
Received: Nov 2, 2004
Accepted: Mar 17, 2005
Published online: Feb 1, 2006
Published in print: Feb 2006
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