Construction of a soil electrical conductivity sensor: a multidisciplinary proposal
Keywords:Conductivity, Sensor, Fertirrigation
The electrical conductivity of the soil is an important variable in agriculture. Their knowledge is essential in fertirrigation and can assist in soil management1. Thus, the proposal of this work is the development of a sensor to determine the electrical conductivity of the soil at low cost. To determine the electrical conductivity, the second law of Ohm (R = ρ (l / A)) is used. The equation of this law relates the electrical resistance of a conductor, with the length of the wire, area of straight section of the wire and the resistivity (or specific resistance of the material). Physically, the electrical conductivity (σ) is the inverse of the resistivity (ρ). Thus, with a microcontroller, an Arduino, a control resistor and conductive plate electrodes, a simple circuit is created to measure the electrical conductivity. The input voltage is 5v, the resistance of the control resistor is 500kohms, with this information the current in the circuit is calculated and the voltage drop in the circuit and consequently the electrical conductivity of the ground is determined.
CASTRO CN. Definição de unidades de gerenciamento do solo por meio da sua condutividade elétrica e variáveis físico-químicas, em Piracicaba/SP [dissertation]. Piracicaba: Universidade de São Paulo; 2004.131p.
MOLIN JP, GIMENEZ LM, PAULETTI V, SCHMIDHALTER U, HAMMER J. Mensuração da condutividade elétrica do solo por indução e sua correlação com fatores de produção. Engenharia Agrícola. 2005; 25(2): 420-426.
NADAI HLL, NACHREINER ML, MENEGATTI LAA, MOLIN JP. Estudos preliminares de um sensor de condutividade elétrica do solo para aplicação em agricultura de precisão [Internet]. 2000. [cited 2018 mar 20]. Available from: http://www.ler.esalq.usp.br/download/gmap/iniciacao/EstudosPreliminaresdeumSensor2000.pdf.
PINCELLI ALS. Desenvolvimento e ensaios de um sistema de mensuração de condutividade elétrica do solo, em Piracicaba/SP [dissertation]. Piracicaba: Escola Superior de Agricultura Luiz de Queiroz -Universidade de São Paulo; 2004. 87p.
ROQUE, W. Desenvolvimento de um multi-sensor eletronico para medida da umidade, temperatura e condutividade elétrica do solo, em Campinas/SP[dissertation]. Campinas: Faculdade de Engenharia Elétrica e de Computação; 2008. 42p.
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