Many producers experienced a loss of pasture or hay fields due to flooding in recent years. Dr. Stephen Barnhart, ISU Agronomy Extension, provides some great recommendations in a recent posting. You can read his commentary here: http://www.extension.iastate.edu/CropNews/2010/0312barnhart2.htm
He makes some great points, including the importance of nitrogen in reestablishment, & the value of variety selection. He also cited the need for the soil pH to be correct.
SuperCal 98G is a great fit for pasture/forage renovation or establishment. Due to its high quality & soil solubility, it will work very effectively to reduce soil acidity in the critical seeding year. We have many producers report that they customarily apply 200-400# with other crop nutrients, either prior to, or as part of, seeding the forage. I always used this product when direct seeding alfalfa in Nebraska, with fabulous results!
I would also suggest including some SuperCal SO4 when working with the conditions Dr. Barnhart discusses. Reestablishing soil microbiology is imperative to a successful seeding, & microbes are often suffering from compaction and/or anaerobic (lack of oxygen) conditions due to flooding. SO4 will provide calcium and sulfur for both the microbes & the establishing crop, & can also help in reducing seedling disease in this environment.
Here's to a great forage year!