Response of Soybean to Halosulfuron Herbicide

Table 2

Effect of halosulfuron on yield of soybean varieties with and without sulfonylurea- tolerant trait in the field studies conducted in Stoneville, Miss, USA in 2007^a.

	Field Study locations
	USDA			MAFES
Variety	Nontreated	Treated^b	Change^c	Nontreated	Treated^b	Change^c
	kg/ha		%	kg/ha		%
DP 4112 RR/S	3383	3222	−4	2426	2321	−4
DP 4888 RR/S	3480	3491	0	3244	3107	−4
DP 4919 RR/S	3333	3292	−1	2667	2397	−10
07-4492 RR/S	4641	4288	−7	3228	1788	−45
DP 5115 RR/S	3131	3055	−2	2783	2307	−17
DP 5335 RR/S	2648	2829	+7	2973	2846	−4
DP 4748 S	3555	3662	+3	3163	2878	−8
P 95M90 RR/S	3097	3217	+4	3397	3214	−5
AG 4903 RR/S	3456	3479	+1	3460	2660	−23
DP 4690 RR	4169	ND^d	—	2737	838	---^e
DP 5989	3422	ND	—	2594	1973	---^e
t-test (0.05)^f			NS			NS
LSD (0.05)^g			NS			18

^aAbbreviations: AG, Asgrow; DP, DeltaPine; P, ND, not determined; P, Pioneer; RR, Roundup Ready; S, sulfonylurea tolerant. ^bSoybean plants were treated postemergence with 0.034 kg  ai/ha halosulfuron. ^cRepresents % change in soybean yield in response to halosulfuron application. “+”and “−”signs indicate yield above and below the nontreated control, respectively, within varieties. ^dYield not determined (ND) due to nonharvestable crop conditions resulting from extreme injury from halosulfuron. ^eYield change not included in analysis to be consistent with data reported for the USDA location. ^f“NS” indicates no significant effect of halosulfuron application on soybean yield according to the t statistic (𝑃=.05) within individual varieties. ^g“NS” (USDA) and 18 (MAFES) indicate no significant difference and significant difference, respectively, in % yield change from halosulfuron application among soybean varieties according to Fisher’s protected Least Significant Difference (𝑃=.05) procedure.