Adaptive Scheduling In Deficit Irrigation –
A Model-data Fusion Approach
Author(s)
M. M. Holloway-Phillips, W. Peng, D. Smith & A. Terhorst
Abstract
The technological demands required to successfully practice either targeted
irrigation control and/or deficit irrigation strategies are currently reliant on
numerical models which are often underutilised due to their complexity and low
operational focus. A simple and practical real-time control system is proposed
using a model-data fusion approach, which integrates information from soil
water representation models and heterogeneous sensor data sources. The system
uses real-time soil moisture measurements provided by an in situ sensor network
to generate site-specific soil water retention curves. This information is then used
to predict the rate of soil drying. The decision to irrigate is made when soil water
content drops below a pre-defined threshold and when the probability of rainfall
is low. A deficit strategy can be incorporated by lowering the irrigation \“refill”
point and setting the fill amount to a proportion of field capacity. Computer
simulations show how significant water savings can be achieved through
improved utilisation of rainfall water by plants, spatially targeted irrigation
application, and precision timing through adaptive control
Keywords: deficit irrigation, wireless sensor network, adaptive irrigation
scheduling, model-data fusion, irrigation decision tree.
1 Introduction
Australia is facing a severe water shortage due to below-average rainfall received
over the past decade. The agricultural sector is the hardest hit by this as
irrigation accounts for almost 65% of total water use nationally [1]. Long-term
climate forecasts suggest that this situation is unlikely to improve [2]. Therefore
Keywords
deficit irrigation, wireless sensor network, adaptive irrigationscheduling, model-data fusion, irrigation decision tree.
Related Book
Other papers in this volume
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