College of Life and Environment Sciences, Shanghai Normal University, Shanghai, 200234, China.
*Correspondence author: E. Mail: dzlin@shnu.edu.cn; lindz@cc.miyazaki-u.ac.jp
1Agricultural Faculty, Miyazaki University, Miyazaki City, 889–2192, Japan.
We evaluated the allelopathic effects of Canna indica on paddy weeds. Aqueous extracts (1, 2, 4, 8%, w/v) from its powdered naturally withered aerial parts inhibited the seed germination and seedling growth of lettuce (Lactuca sativa L.) and two major weed spp. [barnyardgrass (Echinochloa crusgalli L.) and monchoria (Monocharia vaginalis P.)]. All C. indica dried powders at 50, 100, 150 gm−2 significantly inhibited the emergence and dry weights of weeds in paddy field but had no adverse effects on growth of transplanted rice. These results showed that C. indica plants might be used as a natural herbicide to control weeds in paddy field.
Allelopathy, Canna (Canna indica L.), weed control, rice field
