Development of real time and continuous sensing systems for soil physical and mechanical properties provides a\r\nvaluable tool to obtain inexpensive and rapid information of soil current status and future management in the context of\r\nprecision agriculture. This study aimed to design, fabricate and evaluate a mechanical transducer to measure aggregate sizes\r\nin real time by determining dynamic strain behavior of commercially available spring tines in field experiments. Dynamic\r\nstrain was measured with strain gauges mounted on the spring tines and respective circuits. Signals acquired from strain\r\ngauges were received and saved by a data-acquisition system and then analyzed. The results of field experiment data was\r\ncorrelated to standard sieve data. The results show that the transducer�s output voltage increases with increasing aggregates\r\nmean diameters and estimated liner equation was D=13. 827V-33.536 with a correlation coefficient of R2=0. 93. Mean\r\nweight diameter (MWD) was obtained with putting the average of the output signals in the equation. Calculated diameter of\r\nthe mechanical transducer was approximately 25% higher than standard sieve analyses.
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