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A SCM Programmed Suspension Weighing Lysimeter for Evapo-transpiration Measurement of Pot planted Crops

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  131620542,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: http://dx.doi.org/10.13031/aim.20131620542) @2013
Authors:   Wenting Han, Chao Zhang, Junjie Guo, Qiao Jun, Pute Wu
Keywords:   [Lysimeter ET micro-controller pot planted crops.]

Abstract. A weighing lysimeter measuring ETs of pot planted crops was developed with 150kg of weighing capacity and 150g of measurement precision. The hardware parts of the lysimeter includes a micro-controller, data collection and display module, real time clock, storage module, communication and power modules. The circuits for these parts were designed. The data collection software for the host computer and the micro-controller of the lysimeter were written in C# and C respectively. The performance of this lysimeter was tested and the results showed that without human supervision, the micro-controller was able to automatically collect, display, store and communicate data through serial interface to the host computer. The lysimeter was characterized by high stability and repeatability and its absolute and maximum relative error were 150g and 0.75%, respectively; and the ET results of pot planted crops obtained with the instrument were proved well matched with their actual ET of pot planted crops with time.

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