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Fall Surface-Applied Urea Timelines
During late October/November, there may be days where soils are not deeply frozen, but frozen enough to hold up fertilizer applicators. On the warming side of the freeze and thaw cycle, where water can still move into the soil, urea can be applied with little danger of loss. This time of year, urea can stay on the surface for a week with nearly zero loss. When snow melts into the soil, it will move the urea into this soil, protecting it from losses due to volatilization or surface water movement. As the winter deepens, this opportunity will be lost, for although the more frozen soil will hold up equipment, it also will not permit movement of urea into the soil. Surface water movement that could move urea is hard on the pocketbook and the environment. Pay attention to the freeze-thaw cycle and apply urea on the thaw side of the cycle.
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