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Pasture & Hay Fertilization

2007 County Agent Update. Greg Schwab, Extension Soil Specialist UK Department of Agronomy. Pasture & Hay Fertilization. Nitrogen Management. Effects of Agrotain on Corn. Source: Southern Illinois University. NSN – Co-polymer. Experimental product Polymers absorb metals and other cations

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Pasture & Hay Fertilization

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  1. 2007 County Agent Update Greg Schwab, Extension Soil Specialist UK Department of Agronomy Pasture & Hay Fertilization

  2. Nitrogen Management

  3. Effects of Agrotain on Corn Source: Southern Illinois University

  4. NSN – Co-polymer • Experimental product • Polymers absorb metals and other cations • Mechanisms of improved N efficiency not well documented • Has not been shown to be beneficial under KY conditions

  5. 2007 N volatilization Study (Princeton, KY) All Treatments Received 75 lbs N/acre a ab abc abc abcd de e e

  6. All treatments applied V6

  7. Agrotain and Super Urea Hardin County No-till Corn Study All plots received 50 lbs N/acre at planting Side-dress

  8. “New” N Sources Ammonium Sulfate 21-0-0 • Not Subject to Volatilization Loss • Historically Expensive • By-product of Industrial Processes • Low Analysis • Contains Sulfur – Not needed in KY • More Acidic 5.4 lbs Lime /lb N • Urea 1.8 lbs Lime /lb N

  9. Nutrient Content of Manure

  10. A mixture of grass with at least 25% legumes will have a similar yield as pure grass + 300 lbs N/a N Value of the legume 300 x 0.45 = $135/a

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