It took the blistering, hot, drouthy summers of 1934 and 1936 to get Iowa farmers interested in bromegrass as a pasture crop. In those years- and in other hot, drouthy periods- bromegrass pastures have been far superior to bluegrass.
Wilsie, C. P. and Hughes, H. D.
Farm Science Reporter: Vol. 3
, Article 4.
Available at: http://lib.dr.iastate.edu/farmsciencereporter/vol3/iss1/4