%0 Conference Proceedings %T Effects of heavy metals and organic matter on nematode population in soil %A Semsar, Hanieh %A Fotovat, Amir %A Lakzian, Amir %A Khorassani, Reza %A Mahdikhani Moghadam, Esmat %J 11th International Conference on the Biogeochemistry of Trace Elements %D 2011