If roundup herbicide is used on a 40 acre corn field, is it safe to seed the same 40 acres in brome/alfalfa hay in mid-Oct.'07 and expect a decent hay production by May/June '08?
My husband and I are farmers. Roundup is a kill all weeds chemical that according to package directions will remain effective for a period of approximately seven days. So, additional seeding of the area should wait for that seven days to expire before planting…just to play it safe. As to whether or not you can expect a decent hay crop….that depends on your location. Here in Minnesota, the alfalfa would not get a chance to really germinate and set good roots before freeze up thus having a lot of winter kill.



Roundup binds to the clay soil particles. So how's your soil? You should be fine, no residual effect from the Roundup.
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I agree with fluffie, round up will disperse with the new tilling.
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Try this web site.
http://www.agric.gov.ab.ca/app23/processquery?function=products
Hope this helps.
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You can call the company & ask for info.
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My husband and I are farmers. Roundup is a kill all weeds chemical that according to package directions will remain effective for a period of approximately seven days. So, additional seeding of the area should wait for that seven days to expire before planting…just to play it safe. As to whether or not you can expect a decent hay crop….that depends on your location. Here in Minnesota, the alfalfa would not get a chance to really germinate and set good roots before freeze up thus having a lot of winter kill.
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yes…the herbicide is only good for 60-90 days then it loose its effectiveness
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