Fig. 1. The WR-1RH,2C resulted in the highest level of broadleaf weed control both years (99% in 2001, 95% in 2002). The WR provided the longest timeframe for sequential cultivation, as compared to NR-2RH(1L) which only resulted in 65% broadleaf weed control in 2001 and 57% in 2002. (A) Wide row-1 rotary hoe, 2 cultivations (WR-1RH, 2C)-2002. (B, shown here) Narrow row-2 rotary hoeings (1 late) (NR-2RH(1L)-2002.
Image from Crop Management article:
Evaluation of Weed Control Strategies in Organic Soybean Production