Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 19 September 2005
Published in Agron J 97:1443-1451 (2005)
DOI: 10.2134/agronj2004.0314
© 2005 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Aerial Color Infrared Photography for Determining Late-Season Nitrogen Requirements in Corn

Ravi P. Sripadaa, Ronnie W. Heinigerb, Jeffrey G. Whitea,* and Randy Weiszc

a Dep. of Soil Science, North Carolina State Univ., Raleigh, NC 27695-7619
b Dep. of Crop Science, Vernon James Res. and Ext. Center, 207 Research Rd., Plymouth, NC 27962
c Dep. of Crop Science, North Carolina State Univ., Raleigh, NC 27695-7620



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  		Fig. 1. Quadratic-plateau fit of corn grain yield response to N applied at VT (NVT) for different rates of N applied at planting (NPL) at (a) the Tidewater Research Station (TRS, Site 6) during 2000 and (b) the Peanut Belt Research Station (PBRS, Site 9) during 2001. Each point is the mean of three replicates.

 


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  		Fig. 2. Model showing the relationship between economic optimum pretassel N rate (NVT) rate and Relative Green Difference Vegetation Index (RGDVI). Data from 2002 were not used in developing the model.

 


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  		Fig. 3. Relationships between economic optimum pretassel N rate (NVT) rate and Relative Green Difference Vegetation Index (RGDVI) and the best-fit linear-plateau models separated by irrigation.

 


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  		Fig. 4. Relationships between economic optimum pretassel N rate (NVT) rate and Relative Green Difference Vegetation Index (RGDVI) and the best-fit linear-plateau models separated by year.

 




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