Demand for water in Australia is increasing along with growing pressure to maximise the efficiency of irrigation water use and seek additional and alternative irrigation supplies. The scarcity of water supplies coupled with the need for urban communities to dispose of large quantities of treated recycled water from sewage treatment plants has led to increasing interest from urban and rural communities in the reticulation of this water for irrigating adjacent crop-production areas. Proposals to use recycled water inevitably lead to a complex range of issues that need to be addressed, including: • costs and benefits of supplying an additional source of water to current or new cropping systems; • optimum irrigation design and management, particularly where there are multiple sources of irrigation water; • management of overflow from on-farm water storages; and • environmental implications with regard to salinity, runoff, drainage, nitrate leaching, and environmental flows. Simulation models can capture many of the key factors and processes influencing irrigated crop production systems, and can play a useful role in exploring these issues. In this paper, we have described an approach that couples agricultural production system and economic models in a way that enables analysis of the likely benefits and risks of investing in recycled water, although the analysis is equally relevant to any assessment of the value of an additional source of irrigation water, particularly saline water. The approach has been illustrated with a case study of a mixed-crop farm in the Darling Downs region of Queensland, Australia, in which the farm-scale crop production, economic, and environmental implications of investing in recycled water were considered.
[1]
Brian Keating,et al.
DAM EA$Y—software for assessing the costs and benefits of on-farm water storage based production systems
,
2003
.
[2]
M. Robertson,et al.
The FARMSCAPE approach to decision support: farmers', advisers', researchers' monitoring, simulation, communication and performance evaluation
,
2002
.
[3]
Senthold Asseng,et al.
An overview of APSIM, a model designed for farming systems simulation
,
2003
.
[4]
Senthold Asseng,et al.
The new APSIM-Wheat Model: Performance and future improvements
,
2003
.
[5]
Graeme L. Hammer,et al.
APSIM: a novel software system for model development, model testing and simulation in agricultural systems research
,
1996
.
[6]
R. Dalal,et al.
APSIM's water and nitrogen modules and simulation of the dynamics of water and nitrogen in fallow systems
,
1998
.
[7]
T. L. Lyon,et al.
The Nature and Properties of Soils
,
1930
.
[8]
J. R. Kiniry,et al.
CERES-Maize: a simulation model of maize growth and development
,
1986
.
[9]
A. B. Hearn,et al.
OZCOT: A simulation model for cotton crop management
,
1994
.
[10]
W. J. Bond.
Effluent irrigation—an environmental challenge for soil science
,
1998
.