Allelopathy between Medicago sativa and weeds

The allelopathy between weeds and alfalfa were studied andthe results showed that Calamintha graclis, Cerastium sp., Alopecurus aequalis and Youngia japonica showed allelopathy to alfalfa. The seed germination of alfalfa treated with soak solution of C. graclis was significantly lower than that of the control; A. aequalis had a significant negative impact on seedling length of alfalfa; both the seed germination and seedling length of alfalfa treated with the soak solution of C. sp. and Y. japonica were lower than those of the control. The allelochemics of C. graclis, C. sp. and Y. japonica, A. aequalis were water soluble and ethanol soluble respectively. The response of different alfalfa varieties varied, FGC901 was more sensible than GT 13R+FD8.