An early harvest this year makes it a good year to try cover crops. Cover crops can help improve soil tilth, take up excess nutrients, and improve spring planting conditions. Annual ryegrass, and tillage radishes are especially popular. If you are looking for "free" nitrogen, you might try a clover or hairy vetch. No-Till Farmer has a good article with lots of information.
Cover crops can also help take up excess nitrogen and keep it out of tile water. Here is an interesting video about cover crops. This video has more information about specific cover crops.
Its too late for this year, but Soil and Water Conservation Society is sponsoring Cover Crops - Practical Strategies for your Farm in Altoona, Iowa on December 13 and 14.
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