International Scholarly Research Notices

Research Article

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

Table 5

The influence of preemergence and postemergence herbicides on Palmer amaranth control 2 weeks after POST application.^a


Preemergence herbicides^b	Postemergence herbicides^c	2010	2011
		Field B13	Field B13	Field C11
		%

None	No	6d	0b	14d
S-metolachlor	No	65c	92a	62c
S-metolachlor plus fomesafen	No	88ab	99a	90b
None	Yes	82b	93a	65c
S-metolachlor	Yes	89ab	100a	87b
S-metolachlor plus fomesafen	Yes	91a	100a	98a

^aMeans within a year and field followed by the same letter are not significantly different according to Fisher’s Protected LSD test at P ≤ 0.05. Data are pooled over herbicide resistance traits and soybean populations.
^bS-metolachlor and S-metolachlor plus fomesafen applied at 1500 and 1200 + 270 g ha⁻¹, respectively.
^cGlufosinate and glyphosate applied to appropriate herbicide-resistant cultivar at 560 and 840 g ha⁻¹, respectively.