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Expression of Variability in Corn as Influenced by Growth Stage Using Optical Sensor Measurements

K. L. Martin^a, K. Girma^a, K. W. Freeman^a, R. K. Teal^a, B. Tubaa^a, D. B. Arnall^a, B. Chung^a, O. Walsh^a, J. B. Solie^b, M. L. Stone^b and W. R. Raun^a,*

^a Dep. of Plant and Soil Sciences, Oklahoma State Univ., Stillwater, OK 74078
^b Dep. of Biosystems and Agricultural Engineering, Oklahoma State Univ., Stillwater, OK 74078

View larger version (15K): [in this window] [in a new window]   Fig. 1. Mean normalized difference vegetative index (NDVI) and CV from NDVI readings determined from four separate rows, 30 m in length, during growth stages ranging from V3 to R5, EFAW Experiment Station, 2003.

View larger version (13K): [in this window] [in a new window]   Fig. 2. Mean normalized difference vegetative index (NDVI) and CV from NDVI readings determined from four separate rows, 30 m in length, during growth stages ranging from V6 to R5, Lake Carl Blackwell Experiment Station, 2003.

View larger version (14K): [in this window] [in a new window]   Fig. 3. Mean normalized difference vegetative index (NDVI) and CV from NDVI readings determined from four separate rows, 30 m in length, during growth stages ranging from V3 to R5, EFAW Experiment Station, 2004.

View larger version (13K): [in this window] [in a new window]   Fig. 4. Mean normalized difference vegetative index (NDVI) and CV from NDVI readings determined from four separate rows, 30 m in length, during growth stages ranging from V3 to R5, Lake Carl Blackwell Experiment Station, 2004.