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This study was conducted during 1996 and 1997 in a mature pecan orchard gradually thinned over 3 years. Twenty-five percent of the trees were first removed in 1993, 1994, or 1995. The orchard thinned in 1994 was further thinned to 50% in 1995. Diffuse photon flux density of photosynthetic active radiation (PAR) was measured within the tree canopy before and after tree thinning. Sunlight penetration measurements were taken on eight tree sides as follows (N, S, E, W, NE, SE, NW, NE), 24 readings were taken on each tree side three times a day. As expected, penetration of PAR inside the tree canopy increased as thinning reduced tree density. PAR levels recorded at 9, 12 or 15 daytime hours within the tree canopy increased as the solar time increased. Lower light values were found in the north side of the tree canopy compared to other tree sections.

248 Sunlight Penetration within the Tree Canopy after Tree Removal in Crowded Pecan Orchards