摘要 : We investigated the allelopathic potential of soil from Eucalyptus species (E. grandis, E. urophylla and E. grandis CHI urophylla) plantations on the germination and early growth of 4 crops [maize (Zea mays), bean (Phaseolus vulga... 展开 We investigated the allelopathic potential of soil from Eucalyptus species (E. grandis, E. urophylla and E. grandis CHI urophylla) plantations on the germination and early growth of 4 crops [maize (Zea mays), bean (Phaseolus vulgaris), watermelon (Cucurbita pepo) and squash (Citrullus vulgaris)]. Soil samples were collected from different soil horizons (AO, Al and B) and at varying distances from eucalyptus trees and used for growth studies. These soils had variable effects (inhibitory to slightlystimulatory) on test crops. Inhibitory effect was minimum on maize and maximum on black bean. Among the three Eucalyptus species, E. grandis CHI urophylla was most inhibitory against maize, bean and watermelon growth, whereas, E. grandis adversely affected the squash. The soils from Eucalyptus species contained water soluble phenolics and their amount varied with soil horizons. The soil from AO horizon was most inhibitory, suggesting the accumulation of bioactive allelochemicals in this horizon. The study concluded that soil from eucalyptus spp contains inhibitory principles that affected the germination and early growth of crop plants. 收起