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Tables 1 and 2 from:


Grey, T. L. 2007. Utility of residual herbicides in no-till double-crop glyphosate resistant soybean production. Online. Crop Management doi:10.1094/CM-2007-0122-01-RS..



Table 1. Mid-season weed control with residual herbicides and glyphosate in double-crop glyphosate-resistant soybean.

Residual
treatment		 Treatment
timingx		 Rate
(kg ai/ha)		 POST
treatment		 Tall morninglory Sicklepod
Williamson Plains Williamson Plains
2003 2004 2003 2003 2004 2003
% control
Nontreated PRE — None 11 cx 25 c 9 b 15 c 28 c 0 c
Pendimethalin PRE 0.56 None 49 b 85 ab 78 a 59 b 50 b 61 b
Pendimethalin PRE 0.56 Glyphosatey 80 a 81 ab 93 a 89 a 89 a 94 a
Imazethapyr PRE 0.07 None 77 a 91 a 93 a 58 b 51 b 60 b
Imazethapyr PRE 0.07 Glyphosate 66 ab 84 ab 93 a 84 a 82 a 97 a
Clomazone PRE 1.4 None 62 ab 69 ab 83 a 81 a 66 b 73 b
Clomazone PRE 1.4 Glyphosate 72 a 77 ab 93 a 91 a 91 a 95 a
Glyphosate EPOST 0.84 None 65 ab 65 b 76 a 83 a 67 b 94 a
Glyphosate EPOST 0.84 Glyphosate 55 ab 69 ab 93 a 88 a 91 a 96 a

 x Abbreviations: PRE = pre-emergence; EPOST = 1 week after planting early post emergence; POST = 3 weeks after planting post emergence.

 y Glyphosate at 0.84 kg ae/ha for all POST treatments.

 z Mean separation Fisher's protected LSD test, letters within a column indicate F-value was significant at P < 0.05.

Table 2. Mid-season weed control and glyphosate-resistant soybean yield with residual herbicides and glyphosate in double-crop systems.

Residual
treatment		 Treatment
timingx		 Rate (kg ai/ha) POST treatment Large crabgrass Florida beggarweed Wild poinsettia Yield
(kg/ha)
% control
Nontreated PRE — None 14 dz 0 d 0 c 3020 b
Pendimethalin PRE 0.56 None 73 c 71 c 69 b 3170 ab
Pendimethalin PRE 0.56 Glyphosatey 89 ab 91 ab 89 a 3400 a
Imazethapyr PRE 0.07 None 79 bc 73 c 88 a 3060 b
Imazethapyr PRE 0.07 Glyphosate 88 ab 97 a 97 a 3110 ab
Clomazone PRE 1.4 None 80 bc 83 b 63 b 3260 ab
Clomazone PRE 1.4 Glyphosate 91 a 95 a 91 a 3400 a
Glyphosate EPOST 0.84 None 74 c 94 a 89 a 3230 ab
Glyphosate EPOST 0.84 Glyphosate 85 bc 96 a 92 a 3240 ab

 x Abbreviations: PRE = pre-emergence; EPOST = 1 week after planting early post emergence; POST = 3 weeks after planting post emergence.

 y Glyphosate at 0.84 kg ae/ha for all POST treatments.

 z Mean separation Fisher's protected LSD test, letters within a column indicate F-value was significant at P < 0.05.




© 2007 Plant Management Network.