4.3 Time application
of N fertilizers to coincide with the period of maximum crop uptake.
4.4 N fertilization should
be split into at least two applications on irrigated crops requiring greater
than 100 pounds of N per acre.
-
Soils having severe leaching potential should be irrigated
and fertilized on every other row.
-
Use fertigation to apply in-season N fertilizer with high
efficiency irrigation systems.
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Multiple, reduced rate applications of N applied through
sprinkler irrigation systems will increase fertilizer efficiency
and reduce total N fertilizer applied.
4.7 The following recommendations
apply to crops and fields where the leaching potential is moderate to severe:
-
Follow alfalfa or other legumes with high N using crops such
as small grains or corn.
-
Follow shallow rooted crops (such as onions) in the rotation
with a deep rooted crop (such as corn) which will utilize excess N.
-
Use fall planted cover crops, such as rye or triticale, to
scavenge excess N in elevations where fall growth is possible.
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