Our study indicates that fresh and composted manure
have the potential to increase winter wheat yield but also
the level of weed competition. Menalled et al. (2004)
similarly documented that composted swine manure
increased the competitive ability of Amaranthus rudis
(common waterhemp) without increasing soybean (Gly-cine max) yield. Realization of maximum manure
benefits to crops may involve alternative application
methods.Petersen (2003)reported that weed N uptake
and weed biomass was 50% lower with subsurface
banded compared with surface broadcast liquid swine
manure. Additionally, weed management programs that
emphasize competitive crops and timely herbicide use
would help achieve the many advantages of manure
application to crop production