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Fluid Journal : Fluid Journal 2005-2007
Spring 2006 FLUID JOURNAL Page 2 Regardless of the method of P application, response to P fertilization should have been observed across all trials. This is because initial soil test P levels were all below 100 percent sufficiency. Despite this, only 50 percent of the trials showed significant response to applied P. The significant grain yield response to P at Lahoma can be explained by the fact that the soil had a relatively low level of initial soil P compared to the other two sites. This suggests that wheat grain yield can be improved by supplementing P in foliar form when the plant is in need. Over all site and years, PUE was higher when P was foliar applied at 4 lbs/A of P2O5. PUE was as high as 86, 16, and 100 percent at Lake Carl Blackwell (2002), Lahoma (2002), and Lahoma (2003), respectively, when 4 lbs/A of P2O5 was foliar applied at post anthesis. Dr. Girma is research associate, Dr. Raun is regents professor, Dr. Zhang is professor, Department of Plant and Soil Sciences, Oklahoma State University. Dr. Mosali is postdoctoral fellow, the Samuel Roberts Noble Foundation, Ardmore, Oklahoma. Figure 1. Mean corn grain yields (bu/A) for treatments at Guymon and Perkins, Oklahoma, 2002. Figure 2. Mean wheat grain yields (bu/A) for treatments at Lahoma, Oklahoma, 2002-2004.
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