Model-based evaluation of low-cost drip-irrigation systems and management strategies using saline water |
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| Authors: | Louise Karlberg Per-Erik Jansson David Gustafsson |
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| Institution: | (1) Stockholm Environment Institute (SEI), Box 2142, 103 14 Stockholm, Sweden;(2) Department of Land and Water Resources Engineering, Royal Institute of Technology (KTH), 100 44 Stockholm, Sweden |
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| Abstract: | A drip-irrigation module was developed and included in an ecosystem model and tested on two independent datasets, spring and
autumn, on field-grown tomato. Simulated soil evaporation correlated well with measurements for spring (2.62 mm d−1 compared to 2.60 mm d−1). Changes in soil water content were less well portrayed by the model (spring r
2 = 0.27; autumn r
2 = 0.45). More independent data is needed for further model testing in combination with developments of the spatial representation
of below-ground variables. In a fresh-water drip-irrigated system, about 30% of the incoming water was transpired, 40% was
lost as non-productive evaporative flows, and the remainder left the system as surface runoff or drainage. Simulations showed
that saline water irrigation (6 dS m−1) caused reduced transpiration, which led to higher drainage and soil evaporation, compared with fresh water. Covering the
soil with plastic mulch resulted in an increase in yield and transpiration. Finally, two different drip-irrigation discharge
rates (0.2 and 2.5 l h−1) were compared; however the simulations indicated that the discharge rate did not have any impact on the partitioning of
the incoming water to the system. The model proved to be a useful tool for evaluating the importance of specific management
options.
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