Graduate Project
 

Nitrogen and chlorophyll relations to low altitude photographed reflectance of perennial ryegrass

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  • This study was conducted to test a photographic method of determining the relationship, if any, between the spectral reflectance and measured levels of nitrogen and chlorophyll in plots of ryegrass turf. Color and color infrared aerial photos were taken of a grid of 375 plots of ryegrass in June and September of 1993. The spectral data from the photos was used to evaluate and quantify the relationship between recorded reflectance and sampled nitrogen and chlorophyll levels. Regression analysis indicated a relationship, but not conclusively, between most of the biophysical characteristics and the spectral data. The strongest correlations were found between levels of chlorophyll b and the green edge of September's color infrared photo. A strong correlation was also found between chlorophyll and nitrogen levels in June. Mean reflectance of the plots was found to decrease as chlorophyll and nitrogen concentrations increased. Reflectance from the turf may have been affected by various physical, environmental, and atmospheric factors.
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