Abstract
Liquid hog manure is frequently spring-applied prior to corn planting, but concern regarding compaction, planting delays, and nitrogen losses have increased corn producer interest in side dressing. The objective of this study was to compare available nitrogen in side-dressed liquid hog manure versus 28% urea ammonium nitrate (UAN) in terms of fertilizer nitrogen equivalent, yield response, grain protein, soil compaction, and end of season soil nitrates. Field experiments were conducted at three sites in southwestern Ontario from 2003 to 2005. Three rates of liquid hog manure (zero, low, and high) and five rates of UAN (0, 53, 106, 159, 220 lb of N per acre) were applied at side-dress timing in corn. Available nitrogen in side-dress applications of liquid hog manure was equally effective as UAN in supplying corn nitrogen requirements based on comparisons of yield and grain protein concentration. Drier conditions at side-dress timing reduced soil compaction risks and yield reductions arising from possible root pruning were not observed. Side-dressed liquid hog manure should be applied at rates of available nitrogen that correspond to crop nitrogen demand, since like UAN, excess applied nitrogen will be susceptible to late season losses.
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