1College of Agronomy and Biotechnology，China Agricultural University，Beijing 100193，China|2College of Resources and Environmental Sciences，China Agricultural University，Beijing 100193，China
Abstract：This experiment was conducted to study the effects of self-root-grafting（as control），single-root-grafting and double-root-grafting on cucumber yield，rhizosphere microorganism population and enzyme activities in spring and autumn seasons．The results showed that both single-root-grafting and double-root-grafting could significantly increase cucumber yield，populations of soil bacteriam and actinomycetes，decrease the population of fungi and Fusarium oxysporum（cucumber pathogen）．The single-root-grafting significantly decreased the population of Fusarium oxysporum and increased the population of actinomycetes than the double-root-grafting．The order of rhizosphere soil urease，neutral phosphatase，invertase and catalase activity of cucumber produced in autumn were double-root-grafting > single-root-grafting > self-root-grafting（control）．
