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Assessment of Pasture Biomass with the Normalized Difference Vegetation Index from Active Ground-Based Sensors

^a Dep. of Agronomy, Iowa State Univ., Ames, IA 50011-1010
^b Dep. of Plant and Soil Science, Univ. of Kentucky, Lexington, KY 40546-0312. Submitted with the approval of the Director, Kentucky Agric. Exp. Stn. as publication 06-06-119. Supported jointly by Kentucky Agric. Exp. Stn. and USDA CSREES Special Grant Animal Health and Grazing Systems

View larger version (21K): [in this window] [in a new window]   Fig. 1. Regression of herbage dry matter (DM) biomass determined with the rising plate meter (RPM) and the normalized difference vegetation index (NDVI) for the Spindletop hayfield in 2004 (wet year).

View larger version (14K): [in this window] [in a new window]   Fig. 2. Regression of the normalized difference vegetation index (NDVI) against herbage mass (dry matter [DM], kg ha–1) determined by direct harvesting in the Spindletop hayfield in autumn 2004 (wet year).

View larger version (16K): [in this window] [in a new window]   Fig. 3. Semivariograms of the normalized difference vegetation index (NDVI) data from the Animal Research Center pastures grazed by beef stockers at the following stocking rates (SRs): circle denotes light SR; triangle denotes intermediate SR; square denotes heavy SR.

View larger version (24K): [in this window] [in a new window]   Fig. 4. Relationship between the normalized difference vegetation index (NDVI) and herbage mass of all Animal Research Center stocking rate pastures using the optimal 2.0-m buffer radius (dry year).

View larger version (22K): [in this window] [in a new window]   Fig. 5. Histograms of herbage mass observations for Animal Research Center pastures grazed at three stocking rates (SRs). Each observation represents herbage mass per 0.46 m2 (56,000 observations per 3 ha).