Acreages of alfalfa and red clover harvested for seed in Iowa vary a good deal from year to year. Weather and insect pests have kept average yields low, and have kept harvest prospects uncertain. Many farmers don't know on July 15 whether or not they will harvest any seed.
Wilsie, C. P.
"More Alfalfa-Red Clover Seed,"
Iowa Farm Science: Vol. 3
, Article 4.
Available at: https://lib.dr.iastate.edu/farmscience/vol3/iss10/4