Preliminary tests made by the Iowa Agricultural Experiment Station of Hubam, the annual white sweet clover discovered in 1916 by H. D. Hughes of the Farm Crops Section at this station, indicate that this crop will probably prove to be the best green manure crop to seed with small grain in the spring and plow down in the fall of the same year, on soils which are well drained and not acid.
These tests also indicate that it will make an excellent summer and fall pasture crop for cattle and sheep, as it makes a leafy and succulent growth following the removal of a small grain crop, or following the removal of a hay crop when seeded alone. They further indicate that Hubam clover will prove to be a satisfactory emergency leguminous gay crop to seed when red clover or alfalfa fail.
Wilkins, F. Scott, "Hubam Clover" (1922). Circular. Paper 76.