Armstrong Research and Demonstration Farm
Manure application during the mid-summer months is a problem on many farms. Row crops occupy most of the crop acres. Producers inquire as to the advisability of applying liquid swine manure to established alfalfa fields. 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 alfalfa.
Iowa State University
Barnhart, Stephen K., "Liquid Swine Manure as a Fertilizer Source for Established Alfalfa" (2001). Iowa State Research Farm Progress Reports. 1815.