Abstract:Field experiments, simulations and chemical analysis were used to study allelopathy of the aqueous extracts of upper parts of soybean in the stage of podding in rotational, continuous and alternate cropping on the germination and seedling growth of soybean. Allelochemicals in the aqueous extracts were analysed by gas chromatography mass spectrometry (GC/MS). The results showed that radical elongation of soybean were significantly inhibited by the aqueous extracts of soybean in continuous cropping at the co...