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

Table 9

Estimated economic return as influenced by soybean population, preemergence herbicide, or postemergence herbicide in Field E3 during 2011.^a

Treatment factor	Economic return
	$ ha^−1
Soybean population ^b
Low	585b
High	1017a
Preemergence herbicide ^c
None	415b
S-metolachlor	962a
S-metolachlor plus fomesafen	1026a
Postemergence herbicide ^d
No	562b
Yes	1039a

^aMeans within a treatment factor followed by the same letter are not significantly different according to Fisher’s Protected LSD test at P ≤ 0.05.
^bLow and high soybean populations in Field E3 during 2011 were 193,000 and 533,000 plants m⁻², respectively.
^cS-metolachlor and S-metolachlor plus fomesafen applied at 1500 and 1200 + 270 g ha⁻¹, respectively.
^dPostemergence herbicides included glufosinate and glyphosate applied to appropriate herbicide-resistant cultivars at 560 and 840 g ha⁻¹, respectively.