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ESTIMATING COTTON LEAF AREA INDEX NONDESTRUCTIVELY WITH A LIGHT SENSOR

^a USDA-ARS, 810 Highway 12 East, Mississippi State, MS 39762
^b USDA-ARS, 230 Bennett LN, Bowling Green, KY 42104
^c Alabama A&M Univ., P.O. Box 1208, Normal, AL 35762

View larger version (22K): [in a new window]   Fig. 1. Schematic illustration of the under-canopy placement of the AccuPAR during measurement of cotton LAI. m = microcontroller; s = light sensor bar.

View larger version (21K): [in a new window]   Fig. 2. Regression of cotton LAI estimated nondestructively with AccuPAR (LAIa) on LAI measured destructively (LAId) during the 2002 and 2003 cotton growing seasons at Macon and Cruger and during the 2002 growing season at Coffeeville, MS. The fitted lines were constrained to pass through the origin. Each data point is an average of three or four replications. The respective slopes and r2 values for the fitted lines are (a) 1.14** and 0.81 for Macon, (b) 0.93** and 0.66 for Cruger, (c) 0.88** and 0.77 for Coffeeville, and 0.98 (NS) and 0.69 for the line (not shown) fitted to all data points. (** = slopes significantly departed from 1.0 at P < 0.01; NS = departure of slope from 1.0 not significant at P < 0.05).