An evaluation of dual-row and wide-row planting in the Bundaberg district

High density planting provides the sugar industry with an opportunity for increased productivity and profitability as well as other beneficial changes to farming practices. Early adoption of two fonns of high density planting-dual-row and wide-row systems-has reached significant levels in the Bundaberg district with approximately 1600 ha planted. Yield data from 1998 and 1999 from 261 commercial blocks were reviewed to evaluate these planting systems against conventional practices. Overall, two-thirds of dual-row and wide-row blocks recorded superior yields compared to class average yields for the same mill zones, and collectively indicated a significant net gain. In particular, spring plant cane and ratoons responded well to these planting methods. However, yield differences were highly variable and strongly indicated that inadequate management leading to poor establishment, poor weed control, and insufficient moisture, negate potential yield benefits, and lead to inferior yields. This concern was supported by a doubling of net gain demonstrated on faIms in the upper 30% level o[ productivity for mill zones. The data show that dual-row and wide-row planted fields have performed significantly better overall than conventionally planted blocks, and indicate real promise as alternative planting systems.