Management of Palmer Amaranth (Amaranthus palmeri) in Glufosinate-Resistant Soybean (Glycine max) with Sequential Applications of Herbicides

Table 6

Palmer amaranth control and soybean yield as influenced by the glufosinate rate and number of applications^a.

			Palmer amaranth control or soybean yield
Glufosinate application timing (WAP)				2011
2	3	4	2010^b	Nahunta soil series	Lynchburg soil series
								Palmer amaranth control
Yes	No	No	82 b	98 a	89 b
Yes	No	Yes	97 a	100 a	100 a
Yes	Yes	No	99 a	98 a	100 a
Yes	Yes	Yes	98 a	100 a	100 a
				Soybean yield (kg ha^−1)
Yes	No	No	1040 a	2950 b	3030 a
Yes	No	Yes	1020 a	3350 ab	2990 a
Yes	Yes	No	970 a	3360 a	2940 a
Yes	Yes	Yes	1240 a	3030 ab	2530 b
No	No	No	600 b	2780 b	870 c

^aMeans within a year or year and soil series combination for each parameter followed by the same letter are not significantly different according to Fisher’s Protected LSD test at 𝑃≤0.05. Data are pooled over glufosinate rates. Data for the nontreated control were not included in the statistical analyses to allow consideration of factorial treatment structure.
^bNorfolk soil series.