At the same time, results show that weed can evidently increase or decrease inducing effect, the ratio between weed and rice is big, inductivity is changed remarkably.

• 不同稗稻密度比，对水稻化感诱导效应的影响不同，稗稻密度比高，水稻叶化感诱导效应显著增强，而水稻茎、根化感诱导效应显著减弱。