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Published in Agron J 98:968-977 (2006)
DOI: 10.2134/agronj2005.0200
© 2006 American Society of Agronomy
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Aerial Color Infrared Photography for Determining Early In-Season Nitrogen Requirements in Corn

Ravi P. Sripadaa,*, Ronnie W. Heinigerb, Jeffrey G. Whitec and Alan D. Meijerb

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


Figure 1
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  		Fig. 1. Linear-plateau fit of corn grain yield response to N applied at growth stage V7 (NV7) for different rates of N applied at planting (NPL) at the different experimental sites (Table 2) during 2002 and 2003. Each point is the mean of four replicates. Absence of a line indicates that optimum N rate was derived using a series of linear contrasts. PBRS, Peanut Belt Research Station, Lewiston-Woodville, NC; TRS, Tidewater Research Station, Plymouth, NC; IR, irrigated; NI, nonirrigated.

 

Figure 2
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  		Fig. 2. Relationships between optimum N rate at growth stage V7 (NV7) and Relative Green Difference Vegetation Index (RGDVI) (a) separated by irrigation and (b) separated by year. * and ** indicate significance at the 0.05 and 0.01 probability levels, respectively.

 

Figure 3
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  		Fig. 3. Models showing the relationships of optimum N rate at growth stage V7 (NV7) with (a) Green Difference Vegetation Index (GDVI) and (b) normalized near infrared (Norm NIR), both excluding the treatments that had an optimum NV7 rate of 0 kg ha–1. ** indicates significance at the 0.01 probability level.

 




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