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    Soil water sensors reveal subsoil conditions – Part 5: Calibration of instruments

    by Frikkie Koegelenberg, Pr Eng and Hendrik Jordaan In the last edition of this series, we take a quick look at the calibration of instruments and the importance thereof. We thank the ARC Agricultural Engineering in South Africa for making their manual on soil water sensors available to the readers of ProAgri Zambia. Calibration is […] More

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    Soil water sensors reveal subsoil conditions – Part 4: Frequency delay measurements by means of capacitance and heat pulse measurements

    by Frikkie Koegelenberg, Pr Eng and Hendrik Jordaan Frequency delay measurement is based on the measurement of the dielectrical constant of soil or materials. The frequency delay measurement is also called the radio frequency (RF) capacitance technique. We thank the ARC Agricultural Engineering in South Africa for making their manual on soil water sensors available […] More

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    Soil water sensors reveal subsoil conditions- Part 3: Pulse delay measurements

    by Frikkie Koegelenberg, Pr Eng and Hendrik Jordaan The pulse delay measurements method by means of Time Domain Reflectometry (TDR), as well as the frequency delay method, are vested in the principle of measuring the dielectrical constant of materials. The dielectrical constant of a material is the measuring of the capacity (electrical permissiveness) of a […] More

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    Soil water sensors reveal subsoil conditions

    Part 2: The neutron soil moisture meter and tensiometer by Frikkie Koegelenberg, Pr Eng and Hendrik Jordaan Since the neutron soil water sensor measures the absolute amount of water in volumetric units in the soil, this technique will also directly give an indication of the amount of water, in millimetres, to be irrigated. The method […] More