01547naa a2200241 a 450000100080000000500110000800800410001902400390006010000160009924501520011526000090026752008030027665000180107965300120109765300230110965300150113270000160114770000170116370000260118070000190120670000150122577300650124010466142023-06-28       2003    bl uuuu     u00u1 u    #d7 a10.1016/S0925-4005(02)00399-42DOI1 aARTIGAS, J.  aDevelopment of a screen-printed thick film nitrate sensor based on a graphite-epoxy composite for agricultural applications.h[electronic resource]  c2003  aThe present report describes the development of a thick-®lm sensor with intended applications for soil analysis. A probe incorporates three sensors, each at a different depth and featuring a copper plate as the reference electrode. In addition, the probe also contains all necessary instrumentation required for processing the sensor signal and to transmit it via radio. The developed sensors were calibrated in situ using two different soil compositions by adding standard solutions. Results show a quasi-Nernstian response in soil, in response to the addition of fertilisers. Extracts of soil samples analysed by the Kjeldahl method were compared with results from the probe. This comparison con®rms that the sensors are capable or measuring chemical parameters in situ in an automated fashion.  asoil analysis  aIn situ  aNitrate monitoring  aSoil probe1 aJIMENEZ, C.1 aLEMOS, S. G.1 aNOGUEIRA, A. R. de A.1 aTORRE NETO, A.1 aALONSO, J.  tSensors and Actuators part Bgv. 88, n. 3, p. 337-344, 2003.