ABSTRACT: Weed control is one of the important and difficult practices in environment-sound agriculture.
This study was conducted to establish environment-sound weed control in paddy fields using rice bran
pellet. Application of rice bran pellet at a rate of 1~3 Mg ha-1 reduced weed occurrence by 46~69%
without using any chemical herbicide. However, rice bran application at a rate of greater than 2 Mg ha-1
increased protein content in milled rice and decreased palatability value. Therefore, fertilization rate before
transplanting needs to be reduced from N-P2O5-K2O = 55-45-40 kg ha-1 to 28-23-20 kg ha-1, in order to
decrease protein content and increase palatability value without decreasing rice yield. Pyroligneous acid and
brown rice vinegar had a relatively weak activity to inhibit weed emergence compared with rice bran.
When butachlor herbicide was applied at a rate of 0.75 kg ha-1, 50% of recommended rate, co-application
of rice bran pellet at a rate of 1 Mg ha-1 enhanced weed control value from 63% to 75%.
 
Key Words: weed control, rice bran pellet, environment-sound, paddy field