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Fluid Journal : Fluid Journal 2005-2007
12 Fluid Journal FALL 2006 Taking advantage of information that has been recently developed with new P fertilizer technology can be of substantial benefit for 2006 winter wheat and the 2007 growing season. The realization of P fertilizer benefits has been a reality for many years and a key to North American growers competing in world markets. Getting the most out of P or any other fertilizer input is a necessity for success in lowering production costs per unit and Studies have shown new polymer technology combined with fluid P has significant effects on P-use efficiency and crop yields. Fluid P Performance Improved With Polymers Figure 1. Effects of fluid starter and polymer on corn yield and plant P concentration, Scandia, KS, 2003-2005. competing successfully in those markets. Recent studies at Kansas State and other universities have verified that a polymer chemistry improves P fertilizer-use efficiency. The dicarboxylic copolymer Avail® is a high-charge density polymer (cation exchange capacity of approximately 1,800 meq/100gams) that sequesters multivalent cations that would normally form insoluble precipitates with P fertilizer. It can be added to P fertilizer solutions DRS. BARNEY GORDON AND TERRY TINDALL SUMMARY A new polymer technology (Avail®) has been shown to significantly improve phosphorus (P)-use efficiency when added to P fertilizers. The high-charge density of the polymer inhibits P fixation reaction by acting as a platform for sequestration of P fixing cations calcium (Ca) and magnesium (Mg) in high pH soils, and iron (Fe) and aluminum (Al) in low pH environments. Higher concentrations of the polymer have been required in fluid fertilizers than when coated on solid P sources because of a less precise geometry of the affected microenvironment of the fluid band. 225 220 215 210 205 200 195 190 .28 .26 .24 .2 POLYMER POLYMER Yield - bu/A Ear leaf P concentration % %
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