Fall nitrogen recommendations for winter wheat
Preplant N considerations
1) Late-planted wheat should consider 30 lb N per acre preplant.
a) Dates for late-planted wheat are October 15 North of Interstate 40 and November 1 South of Interstate 40.
2) Wheat for grazing and grain should consider 60 lb N per acre preplant
3) Wheat following flood-irrigated rice in the rotation should receive 40 to 50 lb N per
acre preplant or shortly after planting or crop emergence.
The University of Arkansas Division of Agriculture Soil Fertility Team is currently revisiting and researching the recommendation for fall-applied N on late planted wheat. Fall N is essential for tiller development and stand establishment prior to winter dormancy and can impact wheat yields. Many states have fall N recommendations for late-planted wheat and they vary greatly from state to state. Residual soil N in the form of nitrate has been used as an indicator for wheat response to fall-applied N. Research from other states has indicated that wheat planted on soil with nitrate levels < 10 ppm generally have a positive yield response to fall-applied N. Further research is necessary under Arkansas growing conditions to determine more specific guidelines for fall-applied N to late-planted wheat. Please stay tuned in for future discussions on identifying nutrient deficiencies in winter wheat and late-winter N applications.
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