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Estimating Winter Wheat Tiller Density Using Spectral Reflectance Sensors for Early-Spring, Variable-Rate Nitrogen Applications

^a Eastern Shore Agric. Res. and Ext. Cent., 33446 Research Drive, Virginia Polytechnic Inst. and State Univ., Painter, VA 23420
^b Dep. of Crop and Soil Environ. Sci., 424 Smyth Hall, Virginia Polytechnic Inst. and State Univ., Blacksburg, VA 24061

View larger version (38K): [in a new window]   Fig. 1. Inherent variability in winter wheat tiller density and subsequent N rate recommendation across linear transects at three locations in Virginia.

View larger version (13K): [in a new window]   Fig. 2. Relationship between normalized difference vegetation index (NDVI) measurements collected from the same areas traveling either across or with the planted wheat rows using a hand-held spectral reflectance sensor.

View larger version (29K): [in a new window]   Fig. 3. Relationship between winter wheat tiller density and normalized difference vegetation index (NDVI) measurements collected using a hand-held spectral reflectance sensor for 22 site-years in Virginia, 2000 to 2002.

View larger version (38K): [in a new window]   Fig. 4. Linear regression trendlines relating winter wheat tiller density and normalized difference vegetation index (NDVI) measurements collected using a hand-held spectral reflectance sensor for 22 site-years in Virginia, 2000 to 2002.

View larger version (28K): [in a new window]   Fig. 5. Relationship between winter wheat tiller density and normalized difference vegetation index (NDVI) measurements collected using a hand-held spectral reflectance sensor with 95% confidence intervals for 18 site-years in Virginia, 2000 to 2002.