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Comparison of Late-Season Diagnostic Tests for Predicting Nitrogen Status of Corn

Richard H. Fox, William P. Piekielek and Kirsten E. Macneal

Dep. of Agron., 116 ASI Building, Penn State Univ., University Park, PA 16802



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  		Fig. 1. A modified Cate–Nelson graphic analysis relating chlorophyll meter (CM) readings of corn ear leaves sampled at the one-fourth milk line growth stage (MLGS) with relative grain yield

 


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  		Fig. 2. A modified Cate–Nelson graphic analysis relating relative chlorophyll meter (CM) readings of corn ear leaves sampled at the one-fourth milk line growth stage (MLGS) with relative grain yield

 


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  		Fig. 3. A modified Cate–Nelson graphic analysis relating visual ratings of corn ear leaves sampled at the one-fourth milk line growth stage (MLGS) with relative grain yield

 


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  		Fig. 4. A modified Cate–Nelson graphic analysis relating relative visual ratings of corn ear leaves sampled at the one-fourth milk line growth stage (MLGS) with relative grain yield

 


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  		Fig. 5. A modified Cate–Nelson graphic analysis relating stalk NO-3–N concentration at black layer with relative grain yield

 


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  		Fig. 6. A modified Cate–Nelson graphic analysis relating stalk NO-3–N concentration at the one-fourth milk line growth stage (MLGS) with relative grain yield

 




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