This study was carried out to evaluate the effectiveness of selected inter-row weeders to control weeds in rice at advanced states growth and effect of weeding cycles on yield and vegetative treats of rice under organic and System of Rice Intensification (SRI). Four Inter-row weeders of different specifications were selected and evaluated. The experimental field was located at Block D, Sawah Sempadan Tanjun Karang Irrigation Scheme Malaysia. A split plot design with four main plots (machines) and four sub plot treatments (rpm levels) was used in four replications. Results revealed that number wedding cycles was significant at P (≤ 0.05) on yield and vegetative paddy height, with means at three cycles of weeding yielding 13.1tons/ha and 60.05cm respectively. However, due high percentage of crop damage resulting from limited machine ground clearance none of the machines was able to weed at 40 Days after Transplanting (DAT). The effect of machine revolution per minutes on weeding efficiency, field capacity and crop damage were also observed to be significance.

Keywords: Organic rice, weeding cycles, System of rice intensification (SRI), Yield and Vegetative treats.