Interference of Selected Palmer Amaranth (Amaranthus palmeri) Biotypes in Soybean (Glycine max)

Table 3

Percent reduction in soybean yield caused by season-long interference by Palmer amaranth in field experiment.^a,b

Palmer amaranth biotype	Yield reduction
	%
Individual Palmer amaranth biotypes^c
Emanuel (GR)	24a
Macon (GR)	17b
Wayne (GR)	16b
Crisp (GS)	24a
Emanuel (GS)	22a
Johnston (GS)	24a
Palmer amaranth biotypes grouped by response to glyphosate^d
GR	19z
GS	23y

aData are pooled over five 30 cm distance increments from Palmer amaranth and runs (years) of the experiment. Abbreviations: GR, glyphosate resistant; GS, glyphosate susceptible.
bMeans within a parameter and analysis followed by the same letter are not significantly different according to Fisher’s Protected LSD test at 𝑃≤0.05.
cConsists of six Palmer amaranth biotypes.
dConsists of a group of three glyphosate-resistant and a group of three glyphosate-susceptible Palmer amaranth biotypes.