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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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- Spring '12