Agronomy Journal Journal of Natural Resources and Life Sciences Education
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Published online 6 February 2007
Published in Agron J 99:405-414 (2007)
DOI: 10.2134/agronj2006.0027
© 2007 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
This Article
Right arrow Abstract Freely available
Right arrow Full Text Free
Right arrow Full Text (PDF) Free
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Derby, N. E.
Right arrow Articles by Franzen, D. W.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Derby, N. E.
Right arrow Articles by Franzen, D. W.
Agricola
Right arrow Articles by Derby, N. E.
Right arrow Articles by Franzen, D. W.
Related Collections
Right arrow Nitrogen
Right arrow Nutrient Management
Right arrow Site-Specific Analysis

Comparison of Nitrogen Management Zone Delineation Methods for Corn Grain Yield

Nathan E. Derby*, Francis X. M. Casey and David W. Franzen

Dep. of Soil Sci., North Dakota State Univ., Fargo, ND 58105-5638


Figure 1
View larger version (32K):
[in this window]
[in a new window]

  		Fig. 1. Plot layout with treatment designations and Order 1 soil survey.

 

Figure 2
View larger version (43K):
[in this window]
[in a new window]

  		Fig. 2. Zones based on bare soil color in 21.3-m grid format. Thin lines are original zone lines drawn on aerial image. Thick lines are the arbitrary boundaries between areas of varying N credit for soybeans in 2000. The N credits for 2001 fertilizer recommendation were 34, 22, and 45 kg N ha–1 for the west, center, and east portions of the field, respectively. The extracted plots in the lower two maps are Treatments V1 and V2, which were both based on bare soil color in 2001.

 

Figure 3
View larger version (29K):
[in this window]
[in a new window]

  		Fig. 3. Zones developed by Ward's hierarchical cluster analysis for 2002 season in 21.3-m grid format. The extracted plots in the lower map are the V2 treatments plots.

 

Figure 4
View larger version (68K):
[in this window]
[in a new window]

  		Fig. 4. Maps of standardized inverted deep ECa, elevation, and average of 5 yr ranked yield, summed to create the summation method zones by for 2003 and 2004 seasons. The V2 treatment plots are the extracted plots in the lower map.

 




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
The SCI Journals Crop Science Vadose Zone Journal
Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 2007 by the American Society of Agronomy.