A plant height instrument which incorporates RTK (real-time kinematics) quality GPS positioning to establish an exact, unchanging soil elevation reference base while in motion. The positioning data provides the compensation necessary to accurately measure plant height while driving over uneven terrain, overcoming the instability inherent in sonar sensors used with mobile platforms due to irregular terrain. Background: Using a sensor-based approach on a mobile platform, this method of measuring plant height allows users to observe changes in plant growth over time and provides high-quality, high-density data in or near real-time. This system provides a significant advantage over the current method of hand measurements, with comparable accuracy but with the speed of a machine which can acquire data over large areas quickly. A mobile system capable of measuring plant height in real-time could be used directly or with existing tractor electronic control systems to dispense fertilizers or plant growth regulator chemicals at different rates based on a plant’s health status. Such variable rate application of fertilizers or plant growth regulator chemicals has the potential to improve agricultural production efficiencies, increase economic returns to farmers, and reduce environmental risk. Applications:
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