Study of Eucalyptus Allelopathy Effect on Morphophysiological Parameters of Brassica napus L.

In this research effects of aqueous extracts (0, 5%, 15%, 30%) and decompose of Eucalyptus leaf (in ratio 0, 3%,6% with soil) on growth parameters, chlorophyll a, b, soluble sugars and phenolic compounds content of canola (Brassica nupus L) in pot condition were evaluated. The results showed that length, fresh and dry weight of canola were decreased when exposed to different concentrations of decompose while aqueous extracts of Eucalyptus leaf increased them. In addition aqueous extracts and decompose of Eucalyptus leaf increased chlorophyll a , b and rate of them in canola leaf. The findings also indicated canola leaf treatment with aqueous extracts of Eucalyptus increased the soluble sugars in comparison to the control but decompose of Eucalyptus leaf reduced these compounds. On the other hand, Phenolic compounds in canola leaf in response to Eucalyptus aqueous extracts were decreased while decompose of Eucalyptus leaf did nothave considerable effect on them