Abstract:

Effects of crop stubbles and fertilization on the percentage of seeds damaged by pest of soybean continuous cropping (SCC) was studied by completely randomized experiment in Longzhen Farm of Heilongjiang during 2003-2005. The results for 3 years showed that the interaction of the crop stubbles and fertilizations on the percentage of seeds damaged by pest of SCC had no significant influence, and the change of the percentage of seeds damaged by pest among the interaction combinations had no obviously regular either. The main effect of fertilizations on the percentage of seeds damaged by pest of SCC had significantly and very significantly influence, however, the effect of fertilizer kinds and the amounts on the percentage of seeds damaged by pest of SCC had no regular either. The stubble main effect of 2003 and 2004 on the percentage of seeds damaged by pest of SCC had no significant influence; but the one of 2005 had very significant influence. The results from the 3 year trails showed that the percentage of seeds damaged by pest of SCC in soybean stubble was all higher than that in alfalfa and maize stubble in same year, which mean the more the years of SCC get, the heavier the percentage of seeds damaged by pest happen.