Development of sensors, particularly sensors specifically developed for Site-Specific Crop Management, currently lags the other enabling technologies. Real-time sensors, i.e., those that can sense a soil or plant parameter and produce an estimate of the value of the parameter within a few seconds, are under development.Our research has exploited two technologies - spectral reflectance and ion-selective membranes, for sensing of soil parameters. We found that optical estimation of soil organic matter (SOM) and soil moisture content can be accomplished with wide-band and narrow band spectral reflectance data. A rugged portable NIR sensor was developed which was able to predict SOM (r2 = 0.89, SEP = 0.40% SOM) and soil moisture (r2 = 0.94, SEP = 1.88%). A system using ion-selective membranes, field effect transistors, and flow injection analysis was able to predict soil nitrates in manual soil extracts with r2 > 0.90.Research on the sensors for crop parameters has included the use of a light source and photodiodes to measure grain flow rate on a combine. A spring-loaded rod attached to a rotary potientiometer, was shown to count corn plants at harvest with errors in the 5% to 10% range. Preliminary results with a photoelectric sensor appears to have comparable accuracies, while also providing a measure of plant stem diameter.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Real-Time Soil and Crop Sensors - How Well Do They Work?


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    International Off-Highway & Powerplant Congress & Exposition ; 1996



    Erscheinungsdatum :

    1996-08-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Real-Time Omnidirectional Image Sensors

    Yagi, Y. / Yachida, M. | British Library Online Contents | 2004


    Real-time panoramic of multiple sensors

    Beauvais, Jason R. | SPIE | 2008



    Optically powered sensors: are they really fiber optic sensors?

    Werthen, J. G. / Andersson, A. G. / Wu, T. et al. | British Library Conference Proceedings | 1996


    Automotive ICs - they work

    Luce, R.L. | Tema Archiv | 1979