10Beuss S A, Buhler D D, Gunsolus J L. Effects of soil depth and aggregate size on weed seed distribution and viability in a silt loam soil[J]. Applied Soil Ecology, 2001, (16) :209 ~ 217.
10Creech J E, Johnson W G. Survey of broadleaf winter weeds in Indiana production fields infested with soybean cyst nematode (Heterodera glycines)[J]. Weed Technology, 2006,20 (4) : 1066 - 1075.