The objective of this paper was to provide the development of on-the-go soil sensor for rice transplanter, particularly from a perspective of precision agriculture applications. Ultrasonic sensor, electrodes and platinum resistance thermometer were employed for topsoil depth (
TD) and apparent electrical conductivity (EC
a) measurement. Soil fertility value (
SFV) defined as new soil parameter, which consisted of EC
a /
TD. The results of field test revealed that the developed equipments could measure the
TD (R
2 = 0.999), and the
SFV had a strong relationship with measured EC (R
2 = 0.937).
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