Weed Control in Dicamba-Resistant Soybean with Glyphosate/Dicamba Applied at Various Doses and Timings

Table 2

Significance of main effects and interaction for percent visible soybean injury 1 WAA, soybean moisture content at harvest, and soybean yield treated with glyphosate/dicamba at various POST application rates and timings at five Ridgetown, ON, sites (2016–2018) and two Exeter, ON, sites (2017-2018).

Main effects	Injury^† (%)	Moisture (%)	Yield (T·ha^−1)
Application timing
5 cm weed height	0.2^a	15.2^b	2.8^b
15 cm weed height	0.5^a	14.9^ab	3.1^ab
25 cm weed height	1.6^b	14.6^a	3.2^a
Glyphosate/dicamba rate
Untreated control	0^a	16.1^b	1.7^b
900 g·ae·ha^−1	0.1^b	14.6^a	3.4^a
1350 g·ae·ha^−1	0.7^c	14.6^a	3.5^a
1800 g·ae·ha^−1	1.3^c	14.5^a	3.5^a
Interaction
R × T	NS	NS	NS

Note. NS: not significant at level; POST: postemergence; R: herbicide rate; T: application timing; WAA: weeks after herbicide application. Means followed by the same letter within a column are not significantly different according to a Tukey–Kramer multiple range test at . Differences among simple effects are not presented due to negligible R × T interactions. Significance at and levels denoted by and , respectively. ^†No soybean injury was observed at the 4 WAA evaluation.