Posted by paul on May 03, 2010 at 08:02:44 from (76.77.197.242):
In Reply to: roundup ready corn posted by Don V on May 03, 2010 at 07:08:36:
Corn doesn't like competition. You want to spray when the weeds are 2 or so inches tall, can be taller, but hate to wait too long. Spray with a glyphosate (such as Roundup, but there are many cheaper 'generic' brands just as good). About a quart per acre, less water, like 10 gallons per acre, is actually better.
Repeat again just before the corn canopies, or if you see weeds.
This double shot will be hardest on perannuals like Canadian thistle, etc. As long as you invested the money in the seed cost, might as well get good value, and knock those bad weeds down.
Gloyphosate only kills green plants it hits, it becomes inert on the soil in a very short time, will not affect new sprouts.
It takes a while for glyphosate to do something - it travels down to the bottm of the root & kills from the bottom up. You don't want to mix with something that burns the wewed top off fast, the glyphosate won't have a chance to work.
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