Using pot experiment,spatial and temporal heterogeneity of allelopathic potential of living-roots of four common winter-wheat cultivars in amended soil of the Loess Plateau of China was investigated for four consecutive growing seasons through bioassay aqueous extraction from the top soil(0~20 cm) in conjunction with typical statistics theory.There is a significant difference(P=0.01) in allelopathic expression in rhizosphere soil among different wheat cultivars.With regard growth and development processes,r...
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