Automated site-specific irrigation framework and evaluation

McCarthy, Alison (2016) Automated site-specific irrigation framework and evaluation. In: Irrigation Australia International Conference and Exhibition 2016: Irrigation - For Prosperity and Wellbeing, 24-26 May 2016, Melbourne, Australia.

Abstract

The spatial variability of plant available water content and irrigation requirement within a single field can be up to 200%. Measuring this variability typically requires either aerial vehicles (remotely piloted or piloted) with cameras and optical and depth sensors, or ground vehicles (e.g. tractors, mopeds) carrying electrical conductivity and optical sensors over the field. However, conducting these surveys multiple times during the season is time consuming. Alternatively, a fixed sensor could be installed in each management zone in the field, and the infield variability estimated using spatial interpolation. Fieldwork and spatial analysis has been completed to identify the errors in the spatial interpolation and impact on irrigation requirement calculated.

Fieldwork was conducted on 5 ha of two surface-irrigated cotton fields in 2014/15 in Yargullen, Queensland. A weather station and fixed soil moisture sensors were installed. Fortnightly spatial measurements of soil electrical conductivity, Normalised Difference Vegetation Index, Ratio Vegetation Index, optical reflectance and plant parameters extracted from camera images were collected. A spatial analysis was conducted to compare measured spatial variability and variability estimated using spatial interpolation between 1, 4, 10 and 50 locations in the field. The interpolation error reduced as the number of data points in the field increased. An artificial intelligence-based analysis was also conducted to identify the sensor locations that minimised error in interpolation for both soil and plant variability. This analysis indicated that there was only a 30% overlap in optimal locations for both soil and plant parameters.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Speech)
Refereed: No
Item Status: Live Archive
Faculty / Department / School: Current - Institute for Agriculture and the Environment
Date Deposited: 06 Jul 2016 23:32
Last Modified: 10 Jul 2017 03:10
Uncontrolled Keywords: variable-rate; automation; machine vision
Fields of Research : 07 Agricultural and Veterinary Sciences > 0701 Agriculture, Land and Farm Management > 070104 Agricultural Spatial Analysis and Modelling
09 Engineering > 0906 Electrical and Electronic Engineering > 090602 Control Systems, Robotics and Automation
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070302 Agronomy
Socio-Economic Objective: D Environment > 96 Environment > 9609 Land and Water Management > 960905 Farmland, Arable Cropland and Permanent Cropland Water Management
URI: http://eprints.usq.edu.au/id/eprint/29215

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