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Fluid Journal : Fluid Journal 1996-1998
1 Fluid Journal Winter 1998 Summary: University trials have demonstrated that fluid fertilizers in combination with a biodegradable polymer (carpramid) affect growth and production of corn, wheat, and cotton. Under controlled conditions, microscopic examination of enhanced root growth reveals greatly increased root branching and root hair development. Controlled condition studies indicate that the polymer labeled with C-14 is not taken up by the plant and acts externally on the root system. Plant analyses described in patents covering the product (carpramid, marketed as AmiSorb), as well as recent field data, show enhanced nutrient absorption. Not all soils and cropping conditions result in increased crop yield responses to the polymer More remains to be learned as management of this production input is refined and specific conditions affecting responses are determined. Extensive field trials in the United States have indicated excellent crop yield responses to fluid fertilizers in combination with carpramid, marketed as AmiSorb. Row crop studies have shown best overall responses when carpramid was banded at planting, followed by additional applications at sidedressing or through fertigation. Starter fertilizer and topdressed applications have been effective for winter wheat. Carpramid or AmiSorb used in these trials is a synthetic thermal protein produced from the amino acid aspartic acid. Characteristics of the anionic polymer include its high cation exchange capacity arising from the carboxyl groups of amino acid molecules, approximately 300 milliequivalents/l00 grams of the 40 percent active ingredient liquid formulation. Molecular weight is approximately 5,000. Crops responding to fluid fertilizers in combination with this carpramid are summarized below. Corn Illinois. In a 1997 Illinois study, Drs. Larry Murphy and J. Larry Sanders Crops Respond To Fluids In Combination With Carpramid Polymer Researchers report favorable responses in corn, wheat, and cotton in exten- sive field trials across U.S. Figure 1. Corn hybrid responses to fluid starter in combination with 1 qt/A of carpramid, Illinois, Behymer Crop Consulting. 511 720 838 150 140 130 160 170 180 190 Yield - bu/A Control Fluid Fertilizer and Ami Sorb Burris Hybrid Check Starter Starter + 1 qt/A AmiSorb Starter + 2 qt/A AmiSorb 190 180 200 210 220 230 Yield - bu/ Figure 2. Corn yield responses to fluid starter in combination with carpramid, Gordon, Kansas State University. fluid starters in combination with carpramid showed yield increases as high as 14.2 bu/A (Figure 1). The study also included comparison of three hybrids. All plots received fluid starter attheper-acrerateof20N+20P205+7 K2O + 1 qt chelated Zn. Rate of the carpramid was 1 qt/A with the starter. Kansas. Fluid starter was used with carpramid in an irrigated, ridge-till study in Kansas. The carpramid was included at the rates of 1 and 2 qts/A in a fluid starter with a high N:P205 ratio. One quart of the carpramid in the starter, placed two inches to the side and two inches below the seed at planting, produced no yield increase.
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