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Fluid Journal : Fluid Journal 2002-2004
3 Fluid Journal Winter 2003 sites (Figure 4). N fertilizer rates to maximize yield were 150 lbs/A at Cheyenne, 117 lbs/A at Box Butte, 109 lbs/A at Kimball, and 75 lbs/A at Banner. 2000. We observed linear relationships between fertilizer N and corn yield at the Box Butte and Kimball sites, whereas fertilizer N had no impact on corn yield at Banner and Cheyenne (Figure 5). At the latter two sites, corn growth apparently was impacted by the unfavorable growing conditions to such a degree that residual N and N from mineralization were sufficient to supply adequate N. Because yields varied greatly among sites during the two years, data were expressed on a relative basis (i.e., all yields expressed as a percentage of the N treatment with the highest yield at a given site and year) to normalize the response to N supply (Figure 6). Data from the Banner site in 2000 were excluded because at this site essentially no crop was produced. There was a strong relationship between N supply and relative yield. To achieve maximum yield, an N supply of 168 lbs/A was necessary. To optimize yield an N supply of 112 lbs/A was needed. Dr. Blumenthal is assistant professor and Dr. Lyon is professor, Department of Agronomy, University of Nebraska. 0 10 20 30 40 50 60 70 80 0 20 40 60 90 120 140 Nitrogen fertilization (lb N/acre) Grain yield (bu/acre) Banner Cheyenne Kimball Box Butte Figure 5. Effect of N fertilizer on corn yield, 2000. 50 60 70 80 90 100 0 50 100 150 200 250 Soil + Fertilizer N (lb N /acre Relative Yield (%) Figure 6. Relative corn yield as affected by N supply from the soil and fertilizer.
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