Allelopathic Effects of Conyza canadensis Water Extract on Seed Germination and Seedling Growth

In order to investigate the effects of allelo-pathic substances Conyza canadensis on seed germination and seedlings, this study was designed explore allelopathic water extract (CCE) pakchoi, spinach lettuce. Germination rates three crops (pakcholi, spinach, lettuce) during germination, root length, seedling height, fresh weight two (pakcholi were measured under different concentrations CCE treatment (20, 40, 60, 80, 100 g/L). The effect index also calculated. results showed that had a varying degree inhibitory rate seeds crops. Spinach lettuce have significant from C. canadensis. At higher concentration CCE, significantly decreased (P<0.01). After crop measured, It found but it promoting height "low promotion-high inhibition"