Abstract:

The allelopathy of Lagenaria siceraria var. hispida leaf water extract on cucumber, radish and tomato was studied by adopting indoor petri dish bioassay in order to provide the scientific basis of continuous cropping barrier solution in production practice. The results showed that water extract of leaf had significant inhibiting effects on seed germination rate of cucumber, radish in concentrations of 10 g/L, 50 g/L and 90 g/L. The germination rate of cucumber, radish was lower than control. The seed germination rate of tomato was increased at lower concentrations, and decreased at higher concentration. Plant height and fresh weight of cucumber were inhibited in all concentrations. The plant height and fresh weight of radish and tomato were inhibited in 90 g/L, and stimulated in 10 g/L, 50 g/L. The water extract of leaf had significant inhibiting effects in all concentrations on root of cucumber and radish. The roots of tomato were stimulated in 10 g/L and inhibited in 50 g/L, 90 g/L. It was suggested that Lagenaria siceraria var. hispida should be intercropped with tomato and radish, while should be avoided to intercrop with cucumber.