Heavy metal Pb stress on germination and growth of 5 clover varieties

摘要

@@Introduction There are more than 360 species of clover all over the world.Cultispecies such as Trifolium repens,Trifolium p ratense and etc.were widely used nowadays.Clover was not only used as forage,but also used as green manures (Carmela Bahiyyih et al.,2005 ).As the problem of heavy metals contaminating soil is more and more seriously,the plant growth characteristics with heavy metals stress were studied by more and more people.