We harvested our first crop of alfalfa/orchard grass hay on May 21. In order to know how much fertilizer to put on the hay ground we have to take soil cores and send them in for analysis. This will tell us what we need to put on for good hay yields for the rest of the season (alfalfa usually yields 3 cuttings a year, sometimes 4 in a good year).
Recommendations from the University of Nebraska indicate that alfalfa requires P and K for good yields. A worksheet for calculating hay expenses from Iowa State University might be useful as well. For historical perspective, look at this 1912 publication on growing alfalfa in Iowa.
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