Abstract：The effects of root exudates of tillering onion on cucumber（Cucumis sativus L.）soil nutrients and enzyme activities were studied，in which tillering onion cultivars with different allelopathic potentials were taken as donor plant and cucumber was used as accepter plant．Results showed that the root exudates of different tillering onion cultivars improved the contents of available nitrogen，organic matter，available phosphorus and available potassium，suggesting that root exudates of tillering onion increased the content of cucumber soil nutrients．At the concentration of 10 mL deionized water per plant，the root exudate from L06 manifested better effects．The root exudate with higher concentration increased the activities of catalase，peroxidase，invertase and urease．
