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Published in Agron J 98:554-561 (2006)
DOI: 10.2134/agronj2005.0164
© 2006 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Univariate Distribution Analysis to Evaluate Variable Rate Fertilization

E. M. Pena-Yewtukhiwa, Gregory J. Schwabb,* and L. W. Murdockc

a Division of Plant and Soil Sciences, West Virginia Univ., P.O. Box 6108, Morgantown, WV 26506
b Dep. of Agronomy, Univ. of Kentucky, N-122 Agric. Sci. North, Lexington, KY 40546
c Univ. of Kentucky Research & Education Center, 1205 Hopkinsville Street, P.O. Box 469, Princeton, KY 42445-0469


Figure 1
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  		Fig. 1. Treatments and allocation of replications: gray = Flat 1; stripes = Variable 1; dots = Flat 2; black = Variable 2.

 

Figure 2
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  		Fig. 2. Nitrogen application rate at (A) Feekes 3 wheat growth stage and (B) Feekes 6 for Treatment 2 (Variable 1).

 

Figure 3
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  		Fig. 3. Nitrogen application rate at (A) Feekes 3 wheat growth stage and (B) Feekes 6 for Treatment 3 (Variable 2).

 

Figure 4
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  		Fig. 4. Frequency of (a) normalized difference vegetative index (NDVI) values calculated at the Feekes 6 wheat growth stage and (b) wheat yields for the Flat 1 treatment.

 

Figure 5
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  		Fig. 5. Frequency of (a) normalized difference vegetative index (NDVI) values calculated at the Feekes 6 wheat growth stage and (b) wheat yields for the Variable 1 treatment.

 

Figure 6
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  		Fig. 6. Frequency of (a) normalized difference vegetative index (NDVI) values calculated at the Feekes 6 wheat growth stage and (b) wheat yields for the Variable 2 treatment.

 

Figure 7
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  		Fig. 7. Frequency of (a) normalized difference vegetative index (NDVI) values calculated at the Feekes 6 wheat growth stage and (b) wheat yields for the Flat 2 treatment.

 

Figure 8
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  		Fig. 8. Comparison between recommended N rates by Variable 1 and Variable 2 algorithms (NDVI = normalized difference vegetative index).

 




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