Weed Control and Corn (Zea mays) Response to Planting Pattern and Herbicide Program with High Seeding Rates in North Carolina

Table 1

Influence of herbicide program on common ragweed density 6 weeks after treatment (WAT), corn grain yield, and days from planting to silking during 2011^a.

Herbicides applied postemergence^b	Herbicide rate	Common ragweed	Corn
		Density 6 WAT	Grain yield	Time to silking
	g ha^−1	Number m^−2	kg ha^−1	d
No POST herbicide	—	19^a	3290^b	70^a
Dicamba	140	0^b	4140^a	68^c
Glyphosate or glufosinate	560 or 840	1^b	4140^a	68^c
Atrazine	1100	2^b	3910^ab	69^b
Atrazine plus dicamba	1100 + 140	0^b	4180^a	69^b
Atrazine plus dicamba plus glyphosate or glufosinate	1100 + 560 or 840	0^b	4710^a	69^b

^aMeans within a column followed by the same letter are not significantly different at . Data are pooled over hybrid and planting patterns.
^bGlufosinate and glyphosate applied to the appropriate herbicide-tolerant hybrid. S-metolachlor was applied PRE over the entire test area immediately after planting.