"Allelopathic Effects of Euphorbia helioscopia and Papaver rhoeas on Germination and Initial Seedling Growth of Cereal Crops and Weed seeds"

A laboratory study was conducted to investigate the allelopathic effect of aqueousextracts of fresh roots and leaves of sunspourge and field- poppy weeds on germinationand growth of four different plant species; wheat, barley, wild mustard and seabiousseeds. Maximum stimulation ratio of germination percentage was observed on barleyseeds with sunspourge root extract was 23.46%. Maximum stimulation ratio of wheatroot length was 59.16% with sunspourge leaf extract and was 33.02% for barley withfield poppy root extract, while poppy leaf extract reduced wild mustard and seabious rootlength ratio by 37.22% and 29.99% respectively. The highest stimulatory ratio of wheatshoot length was 10.84% with poppy leaf extract at the same time reduced seabiousshoot length by 18.52%. Maximum increasing of wheat fresh weight was 88.76% withpoppy leaf extract and was 87.94% with sunspourge extract leaf for barley whilesunspourge leaf extract decreased wild mustard fresh weight by 77.64%. The highestincreasing ratio of barley seedling dry weight recorded with sunspourge leaf extract was32-85%.