WEED CONTROL

Herbicide Residue

Ally (metsulfuron) at 0.1 oz 75DF/A may carry over in soil for
more than three crop years. The most important factor affecting
Ally carryover is soil pH. The rate of Ally breakdown increases
as soil pH decreases. Ally should not be applied to soils with a
pH above 7.9. Rotational crop restrictions for Ally are found on
page 64 of the 1996 North Dakota Weed Control Guide in the table,
"Rotation Restrictions for Crops Grown in North Dakota." The
minimum recropping interval for durum wheat is 10 months. A
recropping interval of 22 months and 22 inches of cumulative
precipitation should occur before planting proso millet or
safflower on fields west of Hwy 1. A recropping interval of 34
months and 34 inches of cumulative precipitation should occur
east of Hwy 1 for these crops. These crop rotation intervals must
be followed. In addition, a field bioassay should be conducted
before planting susceptable crops.