Authority MAXX/XL

Active ingredients: 
sulfentrazone, chlorimuron
Site of action groups: 
14, 2
Manufacturer: 
FMC
EPA reg number: 
MAXX 279-3413; XL 279-9560
Restricted use product or combination: 
No
Rate (per A): 
Authority XL/MAXX application rates on soils with 2 to 4% OM: coarse-textured - 6 to 7 oz; medium-textured - 7 to 8 oz; fine-textured - 8 to 9.6 oz. Authority XL application rate when followed by a POST application of glyphosate in Roundup Ready soybeans or glufosinate in LibertyLink soybeans, on soils with 2 to 4% OM: coarse-textured - 3.2 to 4 oz; medium-textured - 3.2 to 4.8 oz; fine-textured - 4 to 5 oz.
Application timing: 

Preplant or preemergence up to 3 days after planting.  To minimize risk of crop injury, apply a week or more prior to planting. When applied after planting, apply prior to soybean seed germination to reduce injury to emerging soybean seedlings.

Comments: 
Do not apply Authority XL on soils with pH greater than 7.6. Authority XL rates are not pH-dependent, but rotation intervals for all crops except small grains are extended to at least 18 months for soil pH between 7.2 and 7.6, regard- less of rate. Authority MAXX rotation intervals are not pH-dependent.
Rotation intervals: 

Time to wait to plant following application (months; NR = no restrictions) for Authority MAXX/XL: corn - 10; wheat - 4; oats - 12; alfalfa - 12; clover - 18; soybeans - NR; tomatoes - 15/12; popcorn - 10; sweet corn - 18