Development of capacitive sensor for measuring soil water content

Engenharia Agrícola

Alan K. Rêgo Segundo²  José H. Martins¹  Paulo M. De B. Monteiro¹  Rrubens A. De Oliveira¹  Delly Oliveira Filho¹ 

[1] ,UFV Departamento de Engenharia Agrícola Viçosa MG ,Brasil

关键词: process control;    control system;    irrigation system;    controle de processo;    sistema de controle;    sistema de irrigação;   

DOI  :  10.1590/S0100-69162011000200006

来源: SciELO

【 摘 要 】

The irrigation management based on the monitoring of the soil water content allows for the minimization of the amount of water applied, making its use more efficient. Taking into account these aspects, in this work, a sensor for measuring the soil water content was developed to allow real time automation of irrigation systems. This way, problems affecting crop yielding such as irregularities in the time to turn on or turn off the pump, and excess or deficit of water can be solved. To develop the sensors were used stainless steel rods, resin, and insulating varnish. The sensors measuring circuit was based on a microcontroller, which gives its output signal in the digital format. The sensors were calibrated using soil of the type “Quartzarenic Neosoil”. A third order polynomial model was fitted to the experimental data between the values of water content corresponding to the field capacity and the wilting point to correlate the soil water content obtained by the oven standard method with those measured by the electronic circuit, with a coefficient of determination of 93.17%, and an accuracy in the measures of ±0.010 kg kg-1. Based on the results, it was concluded that the sensor and its implemented measuring circuit can be used in the automation process of irrigation systems.

【 授权许可】

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