Optimizing Irrigation Efficiency using Deep Reinforcement Learning in the Field

• URL: http://arxiv.org/abs/2304.01435v1
• Date: Tue, 4 Apr 2023 01:04:53 GMT
• Title: Optimizing Irrigation Efficiency using Deep Reinforcement Learning in the Field
• Authors: Xianzhong Ding, Wan Du
• Abstract summary: Agricultural irrigation is a significant contributor to freshwater consumption. Current irrigation systems do not account for future soil moisture loss. This paper proposes a solution to improve irrigation efficiency, which is called DRLIC.
• Score: 4.091593765662773
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Agricultural irrigation is a significant contributor to freshwater consumption. However, the current irrigation systems used in the field are not efficient. They rely mainly on soil moisture sensors and the experience of growers, but do not account for future soil moisture loss. Predicting soil moisture loss is challenging because it is influenced by numerous factors, including soil texture, weather conditions, and plant characteristics. This paper proposes a solution to improve irrigation efficiency, which is called DRLIC. DRLIC is a sophisticated irrigation system that uses deep reinforcement learning (DRL) to optimize its performance. The system employs a neural network, known as the DRL control agent, which learns an optimal control policy that considers both the current soil moisture measurement and the future soil moisture loss. We introduce an irrigation reward function that enables our control agent to learn from previous experiences. However, there may be instances where the output of our DRL control agent is unsafe, such as irrigating too much or too little water. To avoid damaging the health of the plants, we implement a safety mechanism that employs a soil moisture predictor to estimate the performance of each action. If the predicted outcome is deemed unsafe, we perform a relatively-conservative action instead. To demonstrate the real-world application of our approach, we developed an irrigation system that comprises sprinklers, sensing and control nodes, and a wireless network. We evaluate the performance of DRLIC by deploying it in a testbed consisting of six almond trees. During a 15-day in-field experiment, we compared the water consumption of DRLIC with a widely-used irrigation scheme. Our results indicate that DRLIC outperformed the traditional irrigation method by achieving a water savings of up to 9.52%.

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