Killing weeds and reseeding pasture
I have a pasture in Hermiston that is full of weeds. When is the best time of year to spray the weeds using 2,4-D? I want to reseed with a mixture of timothy, orchard, and crimson clover. What would be the best percentage of each seed, and how many pounds of seed per acre? Will be used for forage and hay.
Umatilla County Oregon
Ideally, you would want to spray 2, 4-D before the target plants have gone to seed. If there are as many weeds as you describe, it may take several years to deplete the seed bank that is already there, therefore planting clover will drastically limit your ability to use herbicides for weed control.
Penn State Extension Services has some great information on individual species of forage crops which can help with your later questions. (http://extension.psu.edu/plants/crops/forages/species).
Oregon State Extension Services is also working on a Forage Information System, http://forages.oregonstate.edu/fi, which also has some great general information. This sight is still being developed so there may be some pages that are not active yet.
If you have any other questions please feel free to contact the extension office at 541-278-5403 and ask for Chris Schachtschneider.