Winter Annual Weed Response to Nitrogen Sources and Application Timings prior to a Burndown Corn Herbicide

Table 5

Henbit biomass prior to a burndown herbicide application as affected by nitrogen fertilizer source and fertilizer placement in 2008, 2009, and 2010. Data were averaged over N application timings.

Nitrogen source	2008	2009	2010	Average
	g m^−2
Anhydrous ammonia	143	39	66	82
Anhydrous ammonia + nitrapyrin at 560 g ai ha^−1	114	15	35	55
Polymer-coated urea broadcast	275	24	33	109
Polymer-coated urea strip-till placement	83	13	25	40
Nontreated	117	4	31	51
Nontreated strip-tillage only	107	18	21	49
Noncoated urea broadcast	233	47	14	98
Noncoated urea strip-till placement	87	28	13	42
LSD ()	108	NS	NS	38