Farming systems and production management

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Improving the performance of chopper systems in cane harvesters : SRDC Final report BS188S
(1999) Norris, CP; Davis, RJ; Hockings, PR
Commercialisation of lightweight elevator and advanced secondary cleaning system for sugarcane harvesters : Final report BSS251
(2002) Davis, RJ; Norris, CP
The Australian sugar industry is facing the challenge of increasing extraneous matter (EM), depression of ccs, sugar quality issues, and increasing harvesting and transport costs per tonne of final product. In addition, Likewise, cane loss remains a major background issue. Leslie and Wilson (1996) identified EM as a major contributor to the depression of ccs in the northern canegrowing regions. If low EM is seen as paramount by the industry, either cleaning the cane at the mill in dedicated cleaning plants, or improved performance of cleaning systems on harvesters, is required.Improving the performance of harvester cleaning systems is not easy because a number of fundamental problems exist. Rational review of the function of trash removal from a stream of billets and trash, particularly under wet trash conditions, indicates that effective cleaning is extremely difficult to achieve in one pass through any cleaning system. This is due because tof the interactions between the leaf material and billets of cane.The goal of this project was to development of a pre-production prototype lightweight harvester elevator and integrated secondary cleaning system. The project was commercially driven and built on the knowledge gained from the SRDC-funded project BSS210 in which h. The application of high-speed conveyor technology and advanced pneumatic cleaning concepts were integrated into a cane harvester. The design criteria targeted enhanced machine performance through reduced cane loss and EM, whilst reducing machine weight and improving machine stability.
Facilitation of best practice to reduce extraneous matter and cane loss : SRDC Final report BSS189
(2002) Whiteing, C; Norris, CP
Green cane harvesting and trash blanketing are important agronomic production techniques in the northern sugar producing areas. Cane losses are accepted to be higher with green cane harvesting and extraneous matter levels can be high, especially in difficult conditions. A series of harvester trials was conducted throughout the north from 1997 to 2000 to quantify the performance characteristics of current cane harvesters. Samples taken in the field and at the mill were assessed to determine the effect of harvester pour rate and extractor fan speed on extraneous matter. In addition, cane loss was measured using yield data and collection of scrap cane from the extractor systems. Mill weighbridge data and laboratory analysis enabled the impact of harvesting on industry returns to be quantified.Results indicate that current harvester designs have limited ability to clean cane effectively without excessive cane loss, especially at current harvesting rates. The results of trials at commercial pour rates imply that significant cane losses, up to 20 t/ha in some cases, are occurring in the harvesting process.Harvesting Best Practice (HBP) guidelines have been developed to enable harvester operators make informed decisions about operational settings. The guidelines aim to produce high quality cane with minimal cane loss. Extension of this information to growers, millers, harvester operators and manufacturers has encouraged more efficient harvesting and widespread recognition of the limitations of current harvesting technology. Adoption of HBP in the Mulgrave district has potentially reduced losses by a conservative estimate of 3-4 t/ha. This equates to 50,000 more tonnes of cane or a 5% boost in productivity for a district cutting one million tonnes.

Farming systems and production management

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