  Technological advances in the Internet of Things (IoT) have lead the way for
technology to be used in ways that were never possible before. Through the
development of devices with low-power radios, Wireless Sensor Networks (WSN)
can be configured for almost any type of application. Agricultural has been one
example where IoT and WSN have been able to increase productivity, efficiency,
and output yield. Systems that previously required manual operation can be
easily replaced with sensors and actuators to automate the process such as
irrigation and disease management. Powering these devices is a concern as
batteries are often required due to devices being located where electricity is
not readily available. In this paper, a comparison is performed between three
wireless technologies: IEEE 802.15.4 (Zigbee), Long Range Wireless Area Network
(LoRaWAN), and IEEE 802.11g (WiFi 2.4~GHz) for agricultural monitoring with
energy harvesting capabilities. According to experimental results, LoRaWAN is
the optimal technology to use in an agricultural monitoring system where power
consumption and network lifetime are a priority. The experimental results can
be used for the selection of wireless technology for agricultural monitoring
following application requirements.
