Research Article
Winter Annual Weed Response to Nitrogen Sources and Application Timings prior to a Burndown Corn Herbicide
Table 1
Soil test values, nitrogen fertilizer application dates, and weed harvest dates prior to a burndown herbicide application for objectives 1 and 2.
| Year | Organic | Cation | pH | Bray 1 P | Exchangeable (1 M NH4AOc) | N fertilizer dates | Winter annual | Matter | Exchange capacity | (0.01 M CaCl2) | K | Ca | Mg | Autumn | Early preplant | Weed harvest |
| | g kg−1 | kg−1 | | kg ha−1 | | | | Objective 1 | | | | | | | | | | | 2006 | 29 | 14.7 | 6.1 | 80 | 350 | 4703 | 477 | 4 Nov. 2005 | 5 Apr. | 24 Apr. | 2007 | 26 | 13.4 | 6.4 | 34 | 305 | 5001 | 379 | 7 Nov. 2006 | 16 Mar. | 8 May | 2008 | 20 | 14.1 | 6.3 | 40 | 270 | 5017 | 442 | 11 Oct. 2007 | 7 Apr. | 6 May | 2009 | 26 | 17.3 | 6.5 | 52 | 315 | 6161 | 583 | 3 Nov. 2008 | 4 Apr. | 28 Apr. | 2010 | 28 | 15.4 | 6.8 | 31 | 233 | 6112 | 408 | 6 Nov. 2009 | 1 Apr. | 5 May | Objective 2 | | | | | | | | | | | 2008 | 24 | 14.0 | 6.2 | 52 | 297 | 4760 | 428 | 20 Nov. 2007 | 7 Apr. | 24 Apr. | 2009 | 30 | 18.1 | 6.6 | 44 | 293 | 6648 | 519 | 3 Nov. 2008 | 4 Apr. | 4 May | 2010 | 28 | 13.9 | 6.8 | 77 | 326 | 5454 | 367 | 6 Nov. 2009 | 1 Apr. | 16 Apr. |
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