Triketone derivatives and herbicides for lowland fields

摘要

Triketone derivatives represented by the following formula (I) and salts thereof, CHEM wherein Y1, Y2, Y3, n, p, R1, R2, R3 and R4 are as defined in the disclosure, and herbicidal compositions for paddy fields containing at least one of these compounds. The triketone derivatives and the herbicidal compositions for paddy fields are less injurious to paddy rice and have a broad spectrum of control against paddy field weeds with small application rates.