sob1,

If you have ragweed in your pasture, there could be some good reasons and reseeding may not be the answer.

First, Identify the weed. Make sure it is ragweed you are dealing with. It is my expierience that local names for weeds vary from the actual name. There are more than one type of ragweed, there is also a giant ragweed for instance.
Make sure you know what the weed really is. You may need the help of a crop specialist.

Second, Just reseeding the pasture will not always cure the weed problem. Get soil tests before reseeding and get special samples from the ragweed patches, there may be a fertility problem that keeps the grasses from competeing with the ragweeds. Sometimes, soil dranage is an issue, if the soil is wet in these areas especially in late spring, this could cause the grass to drowned out and ragweed seeds will germinate in late spring and summer and take over.

Pasture maintinence is a fine art, and seed is expensive. plowing it under and starting over is not always a bad idea. And I cannot even to begin what problems overgrazing can cause.

but if chemical aplication is the way you decide to go. I would use 2,4-d ester. it's cheap ($1.50/acre) it's safe to almost all grasses, and it will kill ragweed, small brush, and most other broadleaf weeds, even some perenials. you may have to use more than one application during the year. Just make sure you check the label before you let the animals back in to graze.

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