48. Don't Assume That No-till Requires More Herbicide
|
 |
When you change tillage systems, weed pressures change.
For instance, some weeds can increase in no-till-weeds such as
foxtail, fall panicum, marestail, hemp dogbane, and common milkweed.
|
 |
However,
certain weed problems, such as velvetleaf, actually become less of
a problem with no-till. But regardless of the changing weed pressures,
university weed scientists have developed successful no-till systems
using herbicides that give both burndown and residual control with
little or no increase in herbicide use. |
 |
Some
labels do call for slightly increased rates in no-till, compared to
conventional tillage. But in some cases, you may be able to decrease
herbicide use in no-till by taking advantage of certain cover crops
or mulches. In these instances, it may be necessary to use more combinations
of herbicides, such as contact herbicides plus preemergence or postemergence
herbicides. |
 |
To
some no-till farmers, doing any form of cultivation means you no longer
have a no-till system. But other no-tillers see no problem with using
some cultivation as needed. The drawback is that cultivation buries
crop residue, reduces moisture conservation, and can create ridges
and furrows that increase water runoff on sloping fields. |
|