Many of the old permanent bluegrass pastures in Iowa can almost be made “ to feed two cattle where one fed before.” We found this out from a study of the problem at Mt. Pleasant during the 6 years, 1933 to 1938. In the past 3 years some 250 Iowa farmers in 45 counties have cooperated in demonstrating the possibilities of increasing the returns from permanent pastures by introducing clover into old grass sods and from applying lime and phosphate fertilizer in addition to reseeding.
Hughes, H. D. and Thorp, L. J.
"Putting New Life Into Pastures,"
Farm Science Reporter: Vol. 1
, Article 2.
Available at: http://lib.dr.iastate.edu/farmsciencereporter/vol1/iss1/2