Influence of Soybean (Glycine max) Population and Herbicide Program on Palmer Amaranth (Amaranthus palmeri) Control, Soybean Yield, and Economic Return

Table 2

Palmer amaranth population as affected by preemergence herbicides at Rocky Mount, NC, during 2010 and 2011.^a

Year	Field	Palmer amaranth population
		No preemergence herbicide	S-metolachlor	S-metolachlor plus fomesafen
		Plants m^−2
2010	B13	124a	4b	1b
2010	E2	165a	10b	6b
2011	B13	74a	5b	0b
2011	C11	163a	4b	0b
2011	E3	76a	5b	0b

^aMeans within a year and field combination followed by the same letter are not significantly different based on Fisher’s Protected LSD test at P ≤ 0.05. Data are pooled over soybean populations and herbicide resistance traits. Postemergence herbicides have not been applied when Palmer amaranth density was recorded.