The main objective of this paper is to present a yield monitor specifically designed for the implementation of
precision agriculture in sugar cane crops. The overall system includes a mass flow sensor, a global positioning
system receiver, and a data acquisition system. The concept for the sensor is based on the sugar cane yield
monitor sensor developed previously at The State University of Campinas. A modified version of the sensor
was designed to address the specific needs of a harvesting system, including several sensors to eliminate signal
interference, and to monitor the harvesting operation. Field testing of the sugar cane yield monitor system was
done during the 2004–2005 harvesting season. The system was mounted on a Case 7700 sugar cane harvester.
In order to evaluate the accuracy of the system, each loaded truck was weighed on an electronic platform scale
upon arrival at the sugarcane mill. The results showed that the output of the sugar cane yield monitor and the
harvested load weight present a correlation of 066, and the system performance was stable and reliable during
tests. A sugar cane yield map was generated in a 43 ha area plot of a sugar plantation, located in Araras, the
state of Sa˜o Paulo, Brazil. The results showed that the yield monitor designed and evaluated is accurate, with a
mean error of 43% where the maximum error never exceeds 64%, and is capable of measuring the yield
variability.
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