Seven Greenseeker sensors were mounted on a mobile platform to measure cotton NDVI.  These sensors were connected to a CAN bus along with a data logger and DGPS. Two ultrasonic sensors were also mounted on the platform to measure crop height.  The ultrasonic sensors were not connected to the CAN bus, but were connected to the data logger.  Four of the Greenseeker sensors were mounted directly over the crop row and three were mounted to sense the area between the rows.  This system was used to measure NDVI and plant height on several cotton studies involving nitrogen rates and plant growth regulator applications.  This presentation will cover the basic instrumentation system and correlation with manual plant measurements such has height, node count, and height to node ratio.