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Within-field nitrogen response in corn related to aerial photograph color

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Abstract

Precise management of nitrogen (N) using canopy color in aerial imagery of corn (Zea mays L.) has been proposed as a strategy on which to base the rate of N fertilizer. The objective of this study was to evaluate the relationship between canopy color and yield response to N at the field scale. Six N response trials were conducted in 2000 and 2001 in fields with alluvial, claypan and deep loess soil types. Aerial images were taken with a 35-mm slide film from ≥1100 m at the mid- and late-vegetative corn growth stages and processed to extract green and red digital values. Color values of the control N (0 kg N ha−1) and sufficient N (280 kg N ha−1 applied at planting) treatments were used to calculate the relative ratio of unfertilized to fertilized and relative difference color values. Other N fertilizer treatments included side-dressed applications in increments of 56 kg N ha−1. The economic optimal N rate was weakly related (R 2 ≤ 0.34) or not related to the color indices at both growth stages. For many sites, delta yield (the increase in yield between control N and sufficient N treatments) was related to the color indices (R 2 ≤ 0.67) at the late vegetative growth stage; the best relationship was with green relative difference. The results indicate the potential for color indices from aerial photographs to be used for predicting delta yield from which a site-specific N rate could be determined.

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Authors and Affiliations

  1. Agribusiness, Plant and Animal Department, Brigham Young University, Idaho, Rexburg, ID, USA

    J. D. Williams

  2. USDA-ARS, Cropping Systems and Water Quality Research Unit, Columbia, MO, 65211, USA

    N. R. Kitchen

  3. Plant Science Division, University of Missouri, Columbia, MO, 54211, USA

    P. C. Scharf

  4. Plant Science Division, University of Missouri, Portageville, MO, 63873, USA

    W. E. Stevens

Authors
  1. J. D. Williams
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  2. N. R. Kitchen
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  3. P. C. Scharf
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  4. W. E. Stevens
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Correspondence to J. D. Williams.

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Williams, J.D., Kitchen, N.R., Scharf, P.C. et al. Within-field nitrogen response in corn related to aerial photograph color. Precision Agric 11, 291–305 (2010). https://doi.org/10.1007/s11119-009-9137-x

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  • DOI: https://doi.org/10.1007/s11119-009-9137-x

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