Phytotoxicity of Some Medicinal Plants Residues on Emergence andEstablishment Criteria of Canola

The effect of the phytotoxicity of black cumin, dragonhead, dill and soybeans was investigated on the emergence and earlygrowth criteria of canola. experiment was conducted as factorial based on a completely randomized design with threereplications under greenhouse conditions, shahrekord university, 2016. the experimental factors consisted of four speciesof plants (soybean, black cumin, dragonhead and dill), two fertilizer types (organic and chemical fertilizers) and two levelsof plant residue (without and with residue). the results showed that the black cumin residue in soil treated with bothorganic and chemical fertilizers reduced the dry weight of canola seedling. in soil fertilized with organic manure, theeffects of all four plants residues were the same. the chlorophyll b and carotenoid contents of canola seedling significantlydecreased in soil with chemical fertilizer and black cumin or dragonhead residues. in soil fertilized with organic manure,there were no significant differences in the effects of the soybean, black cumin and dill residues. in general, the cultivationof autumn canola should be delayed until the plant residues from black cumin, dragonhead, dill and soybean have beenremoved or until their effects have dissipated after harvest.