Weed Control and Grain Sorghum (Sorghum bicolor) Tolerance to Pyrasulfotole plus Bromoxynil

Table 4

Grain sorghum response and yield as influenced by pyrasulfotole plus bromoxynil combinations in 2009.

Herbicide^1,2	Dose	Timing^3	Chlorosis^4		Stunting		Yield
			Yoakum	Lubbock	Yoakum	Lubbock	Lubbock
	Kg ai/ha			%			Kg/ha
Untreated	—	—	0	0	0	0	5312
Pyrasulfotole (P)	0.03	EP	8	5	8	7	7963
+Bromoxynil (B)	0.20
+Atrazine (A)	0.58
P	0.04	EP	10	9	9	7	7389
+B	0.25
+A	0.58
P	0.03	EP	4	2	2	27	7547
+B	0.20
+A	0.58
+2,4-D Amine	0.22
P	0.03	EP	5	4	18	7	7896
+B	0.20
+A	0.58
+dicamba	0.13
Atrazine	0.58	EP	2	2	3	1	8058
+bromoxynil	0.21
P	0.03	MP	9	27	7	10	8093
+B	0.20
+A	0.58
P	0.04	MP	12	30	8	13	7928
+B	0.25
+A	0.58
P	0.03	MP	8	14	6	2	6816
+B	0.20
+A	0.58
+2,4 Amine	0.22
P	0.03	MP	5	12	9	5	7165
+B	0.20
+A	0.58
+dicamba	0.13
Atrazine	0.58	MP	15	17	1	10	7135
+bromoxynil	0.21
P	0.03	EP + MP	19	38	19	20	8588
+B	0.20
+A	0.58
LSD (0.05)			7	4	9	6	1709

1All herbicide treatments with the exception of atrazine + bromoxynil included ammonium sulfate at the rate of 3.9 kg/378 L.  
²Agridex at 1.0% v/v added to all treatments at Yoakum while R-11 at 0.25% was added to all treatments at Lubbock.
³Abbreviations: EP (early postemergence), grain sorghum 5 to 10 cm tall; MP (mid postemergence), grain sorghum 30 to 41 cm tall.
⁴Rating scale, 0: no chlorosis or stunting, 100: plant death. Chlorosis and stunting ratings taken 10 days after herbicide application.