Research Article
Winter Annual Weed Response to Nitrogen Sources and Application Timings prior to a Burndown Corn Herbicide
Table 4
Winter annual weed number in the spring following N application timings. Data were averaged over application timings.
| Nitrogen sources | 2006 | 2007 | 2008 | 2009 | 2010 | Average |
| ā | Weed number mā2 | 32% urea ammonium nitrate | 153 | 7 | 28 | 161 | 208 | 106 | Ammonium nitrate | 284 | 28 | 60 | 184 | 182 | 147 | Anhydrous ammonia | 123 | 1 | 95 | 89 | 171 | 95 | Polymer-coated urea | 204 | 14 | 74 | 142 | 201 | 125 | Nontreated control | 212 | 28 | 101 | 52 | 215 | 123 | Urea + NBPT (N-(n-butyl) thiophosphoric triamide) | 215 | 3 | 79 | 222 | 183 | 137 | Urea | 218 | 6 | 93 | 130 | 165 | 122 | LSD () | 77 | 15 | 46 | NS | NS | 26 |
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