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Topdress and Side-Dress N Timing (06/25/20)

The stage of wheat and other small grains in North Dakota presently ranges from 4 leaf in later planted grain to heading in the earliest plantings.

The stage of wheat and other small grains in North Dakota presently ranges from 4 leaf in later planted grain to heading in the earliest plantings. In-season N application for yield increase in wheat/durum should be applied by early jointing. Later application will diminish any yield benefit. In-season applications can be made using urea treated with an NBPT urease inhibitor, or using stream bars or something like them, with UAN or any other liquid N product. If using stream bars, use only when wind does not break up the stream into tiny droplets, resulting in a broadcast application that may severely burn the plants.

In corn, it is important in North Dakota to apply the rest of any needed N by the end of V8. Application later than V8 will result in diminished yield in these northern latitudes because our corn hybrids will have already made their yield component decisions. In regions south of here, this window extends a couple leaves, but not in North Dakota. If equipment, labor and fertilizer sources are available, the fertilizers available for sidedress between the rows include anhydrous ammonia, coulter-applied UAN, UAN dribbled between the rows, UAN using y-drops or something like them, or urea applied between the rows. Urea broadcast over the whorl should be limited to 60 pounds N/acre (about 130 lb urea/acre) to avoid burning new leaves.

 

 

Dave Franzen

Extension Soil Specialist

701-799-2565

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