Abstract
<abstract> <bold>Abstract.</bold> Radio propagation behavior plays an important role in the applications of wireless sensor networks (WSNs) in agricultural environments. Previous researches about the performance of radio transmission are limited due to the lack of understanding of effects from various growth stages of plants. In this study, the radio propagation of nodes of WSNs was evaluated at specific growth stages of corn plants (VT and R5) through a field experiment. Average power gain was estimated by measuring the received signal strength indication (RSSI) at the VT and R5 growth stages of corn plants at different antenna heights and directions of transmission paths in a corn field. Path loss models developed for growth stages of corn plants were verified at these two specific growth stages. The results showed that the increase of dry matter of corn plants at VT and R5 affected the path loss exponent even if the antenna height did not change. Energy decayed faster at VT than at R5 when the antenna was kept 60% Fresnel zone clear.
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