Determining bio-herbicidal potential of rapeseed, radish and turnip extracts on germination inhibition of cutleaf ground-cherry (Physalis angulata L.) seeds.

A laboratory study was conducted to determine bio-herbicidal potential of fresh shoot and root extracts of rapeseed (Brassica napus L. ssp. oleifera DC.) cv Westar, round white radish (Raphanus sativus L.), garden radish (Raphanus sativus L.), black radish (Raphanus sativus L. var. niger), little radish (Raphanus sativus L. var. radicula) and turnip (Brassica campestris L. subsp. rapa) at various concentrations (20, 40 and 80 mL L-I) on cutleaf ground-cherry (Physalis angulata L.) seed germination. The experimental design was a Randomized Complete Block in a split plot arrangement with three replications. Fresh shoot and root extracts of Brassica species had different levels of germination inhibition rates. The highest germination inhibitions were obtained from rapeseed shoot extract with 58.7% and turnip root extract with 54.3%. Inhibitory effects of fresh shoot and root extracts increased with the increasing rate of extract concentrations.