The timing and method of manure and fertilizer

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Unformatted text preview: d method of manure and fertilizer applications determine the availability of nitrogen to the crop, but also the potential for loss. Spring applications with immediate incorporation will conserve ammonium from volatilization losses. Fall cover crops act as a “nutrient savings account” by taking up residual N from the growing season or fall manure applications and, thereby, reducing leaching losses. The nutrients in the cover crop become available for the next crop (by mineralization) after the sod is rotated. NH3 ammonia Volatilization losses are higher for manures and urea fertilizers that are surface applied and not incorporated (by tillage or by rain) into the soil. Manure contains N in two primary forms: ammonium and organic N. If manure is incorporated within one day, 65% of the ammonium N is retained; when incorporated after 5 days the ammonium N will have been lost through volatilization. Organic N...
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