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Evaluation of electrical resistivity imaging (ERI) for in situ mapping of drip irrigation and fertigation wetting patterns


Ridgers, J and Hardie, M and Swarts, N and Close, D, Evaluation of electrical resistivity imaging (ERI) for in situ mapping of drip irrigation and fertigation wetting patterns, Proceedings of the Soil Science Australia National Soil Science Conference 2014, 23-27 November 2014, Melbourne, Australia, pp. 1-4. (2014) [Refereed Conference Paper]

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Copyright 2014 Australian Society of Soil Science Incorporated

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Drip fertigation is regarded as a precise and efficient method of supplying water and nutrients to tree crops. Despite its widespread use in a range of agricultural industries, there is limited research into the distribution of water and solutes after fertigation and irrigation events. Here, we compare Electrical Resistivity Imaging (ERI) with dye tracer patterns and soil nitrate distribution in a commercial apple orchard in southern Tasmania. Fertigated calcium nitrate was applied with dye tracer through pressure compensated drippers along the treeline of the orchard row. This was followed by a single irrigation event the next day via in-line drippers, split into high and low treatments over the fertigated area. Two dimensional ERI was conducted over a 16 meter length of crop row, immediately before and at four occasions post fertigation. ERI was shown to be a potentially useful tool for mapping infiltration of irrigation and nitrate, as changes in resistivity appeared to be correlated with infiltration, although the contribution to the change in resistivity from irrigation as opposed to the solute content of the fertigation could not be determined. Dye analysis indicated infiltration of water resulted from preferential flow processes whereas infiltration of the nitrate indicated it was absorbed by organic matter within the A1 horizon.

Item Details

Item Type:Refereed Conference Paper
Keywords:electrical resistivity, soil water, drip irrigation, fertigation, apple
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Agriculture, land and farm management
Research Field:Agriculture, land and farm management not elsewhere classified
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Terrestrial systems and management not elsewhere classified
UTAS Author:Ridgers, J (Mr James Ridgers)
UTAS Author:Hardie, M (Mr Marcus Hardie)
UTAS Author:Swarts, N (Dr Nigel Swarts)
UTAS Author:Close, D (Professor Dugald Close)
ID Code:98117
Year Published:2014
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2015-02-02
Last Modified:2018-04-05

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