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Fluid Journal : Fluid Journal 2008-2009
Seymore is a Distance M.S. degree student from Dodge City, KS, and Dr. Leikam is president of the Fluid Fertilizer Foundation in Manhattan, KS. with the water-soluble Zn level of the specific Zn fertilizer used. Likewise, the change in Zn soil test level was also directly related to the Zn application rate. Figure 1 presents the interaction between water-soluble Zn percentage of the Zn fertilizer and Zn application rate. At any given Zn application rate, the higher the water- soluble percentage of the material, the greater the effected change in DTPA Zn soil test. While the non-water-soluble Zn present in Zn oxysulfate does have some effect on long-term DTPA Zn soil tests, the water-soluble Zn fraction of these materials has a much greater effect. In order to increase DTPA Zn soil tests one Figure 1. Effect of various Zn sources on DTPA Zn soil test. part per million, about 5.0 lbs/A of broadcast water-soluble Zn was required. At the same time, it took 14.6 lbs/A of non-soluble Zn to effect a one-part-per-million DTPA soil test change. Stated another way, the water-soluble portion of Zn oxysulfate and Zn sulfate is about three times more effective in building DTPA Zn soil test values than the non-water- soluble fraction (Figure 1).
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