Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 3 January 2006
Published in Agron J 98:43-54 (2006)
DOI: 10.2134/agronj2005.0005
© 2006 American Society of Agronomy
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Economic Analysis of Spatial-Temporal Patterns in Corn and Soybean Response to Nitrogen and Phosphorus

D. M. Lamberta,*, J. Lowenberg-DeBoerb and G. L. Malzerc

a ERS-USDA, 1800 M St., N.W., Washington, DC 20036
b Dep. of Agricultural Economics, Purdue Univ., 403 West State St., West Lafayette, IN 47907-20566
c Dep. of Soil, Water, and Climate, Univ. of Minnesota, 1991 Upper Buford Circle, St. Paul, MN 55108



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  		Fig. 1. Scheme of the Windom VRT-N,P experiment showing a single response block as an example. Corn and soybean yield points correspond with the squares. In each P block, three treatments of P were applied. All N and P treatments were randomized.

 


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  		Fig. 2. Bare soil images (1996), hillside seepage areas (aerial photo, 2001), and kriged P and %OM soil tests. A = seepage area, P section 1; B = seepage area, P section 1; C = seepage area, P section 1; D = high organic matter (6–10%), with soil P tests between 7 and 11 mg kg–1 [ppm], P section 2; E1,F1 = hillside seepage area on the downward slope of the eroded hilltop area, and the eroded hilltop area, P section 2; E2,F2 = eroded hilltop area and hillside seepage area on the downward slope of the eroded hilltop, P section 3; G = high P area associated with an old dairy entrance (P > 15 mg kg–1 [ppm]). Field aspect and slopes are denoted by the vectors.

 


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  		Fig. 3. Spatial and temporal corn responses to N and P. Bars are 90% confidence intervals.

 


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  		Fig. 4. Spatial and temporal soybean responses to P. Bars are 90% confidence intervals.

 


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  		Fig. 5. Standardized linear response coefficient estimates to N and P for corn and soybean.

 




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