Completed projects and reports

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Increased profitability and water use efficiency through best use of limited water under supplementary irrigation : SRDC Final report CSE001
(SRDC, 2005) Inman-Bamber, NG
The objectives of this project towards increased profitability and water use efficiency was to:
SRDC Research Project final report Increased CCS, cane yield and water use efficiency by exploiting interactions between genetics and management
(2009) Inman-Bamber, NG
In October 2003 delegates at an international workshop on sugarcane physiology funded by SRDC concluded that priority should be directed at a better understanding of traits responsible for high yield and high sucrose content, in order to better design future genotypes. While pathways of sucrose accumulation were and are being investigated at the molecular and cellular levels, there was no concurrent work at the crop level. Consequently it is difficult to answer the questions- To what extent will genetic improvements be modified by management and the environment? and conversely, To what extent does management and environment influence the selection of varieties? These and other questions about the genotype x environment (GxE) interaction on sucrose accumulation and lodging were the major concerns of this project with sucrose accumulation as the predominant issue. This project forms part of a large effort now underway worldwide to find alternative methods to develop cultivars with improved sugar content. The main objective was to better understand the interactions between sugarcane genetics and the environment (including management) with respect to sugar accumulation. After four years of intensive work the project has delivered extensive new knowledge on the physiology of interactions between sugarcane genetics and the environment with respect to sugar accumulation and lodging and as such has met the main objective of the research.
Efficient use of water resources in sugar production; optimising the use of limited water under supplementary irrigation
(2000) Inman-Bamber, NG; Robertson, MJ; Muchow, RC; Wood, AW; Wegener, MK; Spillman, MF
About 60% of sugar produced in Australia depends on irrigation. In some regions, production would be impossible without irrigation; in others, irrigation is used to supplement rainfall. It can improve production and reduce risks in the more variable rainfall environments. The whole subject of supplementary irrigation has taken on a new focus in recent years as termsof- trade for cane growers continue to deteriorate, and as pressure mounts for more efficient management of a scarce national resource. Best practice with limited water, however, depends on complex biophysical and economic factors as well as sensitive off-site impacts. From a biophysical point of view, questions arise as to the probability of achieving the desired irrigation responses in the various regions and seasons, and the extent to which this is affected by crop water requirements at various stages and by variety and soil type. From a management point of view, the questions concern source of the water, the amounts available, and the best crop type and block on which to apply it. Finally, from an economic point of view, the questions concern the interactions between the above factors and the size of the investment required, the likely price of cane, and the probability of achieving sustained profitability from the investment during its lifetime. The aim of this project, therefore, was to address this complexity by developing and applying a generic methodology for assessing the payoffs of supplementary irrigation, taking account of the above factors.

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