STP1078

    Soil Organic Matter Sensing for Precision Herbicide Application

    Published: Jan 1990


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    Abstract

    A prototype sensor which used near infrared (NIR) reflectance techniques to determine the organic matter content of the surface layer of soil was developed and was tested both in the laboratory and in the field. Laboratory predictions yielded an r2 of 0.89 and a standard error of prediction of 0.23% organic carbon (0.40% organic matter) with 30 representative Illinois soils. Limited in-furrow field operation of the sensor produced a much higher standard error (0.53% organic carbon), due to the movement of the soil past the sensor as scanning was accomplished. Although improvements in sample presentation techniques are required before the sensor can be used in real-time field operation, the current configuration could provide rapid, on-site organic matter determination for mapping and subsequent application rate control using a positioning system.

    Keywords:

    organic matter, near infrared, diffuse reflectance, pesticide application, multivariate calibration


    Author Information:

    Sudduth, KA
    Agricultural EngineerSupervisory Agricultural EngineerPresident, USDA-Agricultural Research Service, Agric. Engineering Bldg., Univ. of MissouriUSDA-Agricultural Research Service, 376 AESB, Univ. of IllinoisAGMED Engineering Services, ColumbiaUrbanaSpringfield, MOILIL

    Hummel, JW
    Agricultural EngineerSupervisory Agricultural EngineerPresident, USDA-Agricultural Research Service, Agric. Engineering Bldg., Univ. of MissouriUSDA-Agricultural Research Service, 376 AESB, Univ. of IllinoisAGMED Engineering Services, ColumbiaUrbanaSpringfield, MOILIL

    Funk, RC
    Agricultural EngineerSupervisory Agricultural EngineerPresident, USDA-Agricultural Research Service, Agric. Engineering Bldg., Univ. of MissouriUSDA-Agricultural Research Service, 376 AESB, Univ. of IllinoisAGMED Engineering Services, ColumbiaUrbanaSpringfield, MOILIL


    Paper ID: STP25375S

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP25375S


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