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.