Abstract
Sensing of chlorophyll status in corn, which is a good indicator of nitrogen sufficiency; at V6 growth stage based on spectral measurements is limited by changes in cloud cover and solar angles and soil background. Toward this end, hyperspectral characteristics of corn plants with variable chlorophyll levels, variable cloud cover, and variable solar angles are presented. Investigation has found that spectral reflectance response patterns (SRRPs) of corn plants at the same chlorophyll level (in SPAD units), acquired as cloud cover and solar angle change between 0950 and 1450 h, show consistent divergence/convergence characteristics, which are unique and qualitatively correlated to the chlorophyll level Furthermore, a strong correlation was obtained between chlorophyll readings to the near infrared/green (NIR/G) ratio (r 2=0.94, root mean square error=1.44 SPAD units) at constant solar irradiance. The higher correlation between NIR/G ratio and SPAD readings has been accredited to the proper positioning of a sensing probe.
| Original language | English (US) |
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| Pages | 2657-2672 |
| Number of pages | 16 |
| State | Published - Dec 1 2000 |
| Event | 2000 ASAE Annual International Meeting, Technical Papers: Engineering Solutions for a New Century - Milwaukee, WI., United States Duration: Jul 9 2000 → Jul 12 2000 |
Other
| Other | 2000 ASAE Annual International Meeting, Technical Papers: Engineering Solutions for a New Century |
|---|---|
| Country/Territory | United States |
| City | Milwaukee, WI. |
| Period | 7/9/00 → 7/12/00 |
All Science Journal Classification (ASJC) codes
- Engineering(all)