RT Journal Article SR Electronic T1 Economic impact of varying swine manure application rates on continuous corn JF Journal of Soil and Water Conservation FD Soil and Water Conservation Society SP 460 OP 464 VO 46 IS 6 A1 Craig Chase A1 Michael Duffy A1 William Lotz YR 1991 UL http://www.jswconline.org/content/46/6/460.abstract AB Yields per hectare and whole-farm returns were evaluated under seven fertilization treatments. Five treatments used swine manure; the other two used a commercial fertilizer application and a check treatment. The 112.2-kl (12,000-gallon) surface manure application achieved the highest average yield per hectare. The commercial fertilizer treatment produced the third highest average yield, significantly below that of the 112.2-kl treatment. Average yield on the check treatment was significantly lower than the yields of all other treatments. Given a 100-sow herd and 101.3-ha (250-acre) farm, the 112.2-kl application rate would cover only 14.8 ha (37 acres). The remaining 865 ha (213 acres) would need commercial fertilization. Because of the required manure coverage, the 18.7-kl and 37.4-kl (2,000– and 4,000-gallon) injected treatments received the highest economic returns per hectare. Moreover, the 18.7-kl and 37.4-kl injected treatments produced the highest returns per hectare over a range of hectares and prices. Thus, there is an economic advantage for injecting versus surface application given comparable application rates. Moreover, a more efficient use of manure at lower rates (18.7 or 37.4 kl/ha) was both economical and labor-saving compared to disposal methods (112.2-kl/ha).