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Remote Sensing of Canopy Dynamics and Biophysical Variables Estimation of Corn in Michigan

^a Dep. of Crop and Soil Sciences, Michigan State Univ., East Lansing, MI 48824
^b Center for Precision Agricultural Systems, Washington State Univ., Prosser, WA 99350-8694
^c Dep. of Geography, Michigan State Univ., East Lansing, MI 48824

View larger version (40K): [in a new window]   Fig. 1. Seasonal (May–September) weekly average temperature (°C) and rainfall (mm) for the 1999 and 2000 growing seasons.

View larger version (29K): [in a new window]   Fig. 2. Variation in nitrogen sufficiency index (NSI) over time for irrigated and nonirrigated N treatments in 1999 and N treatments averaged over irrigation in 2000.

View larger version (27K): [in a new window]   Fig. 3. Variation in the relative reflectance of corn canopy as a function of wavelength near silking on 5 Aug. 1999 for both irrigated and nonirrigated N treatments and near silking on 4 Aug. 2000 for N treatments averaged over irrigation. PSNT, presidress nitrogen treatment.

View larger version (28K): [in a new window]   Fig. 4. The relationship between corn grain yield and spectral vegetation indices on 12 Aug. 1999 and 9 Aug. 2000. GNDVI, green normalized difference vegetation index; NDVI, normalized difference vegetation index; SRI, simple ratio index.

View larger version (29K): [in a new window]   Fig. 5. The relationship between corn grain yield and corn leaf chlorophyll and GNDVI and corn leaf chlorophyll on 12 Aug. 1999 and 9 Aug. 2000. GNDVI, green normalized difference vegetation index.

View larger version (18K): [in a new window]   Fig. 6. The relationship between modeled leaf area index (LAI) from vegetation indices and measured LAI for all N treatments for 2000 growing season. GNDVI, green normalized difference vegetation index; NDVI, normalized difference vegetation index; SAVI, soil adjusted vegetation index.