Northern Research and Demonstration Farm
Manure application during the mid-summer months is a problem on many farms. Corn or soybeans occupy most of the crop acres. Producers inquire as to the advisability of applying liquid swine manure to established bromegrass or an annual forage grass crop. A series of studies was initiated in 1998 at the Northern Iowa Research Farm to investigate the suitability of liquid swine pit manure as a fertilizer source for annual and perennial grass forage crops.
Iowa State University
Barnhart, Stephen K., "Liquid Swine Manure as a Fertilizer Source for Annual and Perennial Grass Forage" (2001). Iowa State Research Farm Progress Reports. 1805.