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Wireless Soil Moisture Monitoring

Measurement and monitoring of soil moisture is becoming commonplace for irrigation management and to quantify drainage. In some crops wireless soil moisture monitoring using soil moisture sensors that continuously measure soil moisture and telemeter the measurements to a web base are suitable. Not all sensors are the same, so how do you choose and get the best from sensors?

There are many companies making soil moisture sensors to measure the soil’s dielectric constant and convert to volumetric water content (V%).  All of the sensors are sensitive to both soil temperature and salinity (conductivity). Temperature and conductivity are simple to measure (easier than soil moisture), but the relationship with V% is complex.

All sensors measuring the dielectric constant require calibration to read volumetric soil moisture. The calibration could be a universal “factory calibration”, one based on soil texture (e.g. sand, silt or clay) or most preferably a field calibration.

HydroServices has been testing and using dielectric sensors in various locations for a number of years. Every sensor measures a different volumetric soil moisture content – even at the same location. HydroServices expertise and experience has found the factory calibration does not provide an accurate soil moisture measurement. Field calibration is needed and essential.

Sites installed by HydroServices are field calibrated to obtain accurate volumetric soil moisture (V%). Field Capacity (or Full Point), Available and Readily Available Water, Saturation and Wilting Point are determined by HydroServices

Irrigation Management Contacts

Phil Neill
Manager, Irrigation Management
M: 027 457 9863
P: +64 3 341 0970
phil@hydroservices.co.nz

Mark Fitzgibbon
Mid/South Canterbury Area Manager
M: 027 457 0413
P: +64 3 341 0970
mark@hydroservices.co.nz
Job Quantock
North Canterbury Area Manager
M: 027 534 3886
P: +64 3 341 0970
job@hydroservices.co.nz

Melanie Smith
North Island Area Manager
21 Ruahapia Road, RD 2
Hastings 4172
M: 027 444 7349
P: +64 6 873 4045
melanie@hydroservices.co.nz
SCHEDULING ORDER FORM

Please note emailed reports require rainfall and irrigation records emailed to This email address is being protected from spambots. You need JavaScript enabled to view it. and broadband is an advantage.

TERMS AND CONDITIONS: Payment must be made by the 20th of the month following the date of the invoice, unless prior arrangement for extended credit has been made. Interest of 18% will be charged monthly on overdue accounts. Debt collection will be taken at the discretion of HydroServices Limited after 60 days. This cost will be added to your account. Any instructions received by HydroServices from the client for the supply of our services, shall constitute acceptance of the temrs and conditions contained above.

What we will do for you!

If you are planning to install or have a wireless soil moisture site, we can:

  • Install your device and sensors, and carry out a field calibration.
  • Calibrate the sensor(s) with accurate soil moisture measurement using a neutron probe. 3 - 5 measurements are taken over a range of soil moisture contents. A precise relationship of volumetric soil moisture (V%) will be developed to convert sensor measurements.
  • Determine field capacity and irrigation trigger level(s)
  • Monitor integrity of telemetered
  • Provide recommendations for irrigation timings and amounts
  • Quantify drainage below the root zone
  • Provide an end of season summary of rainfall and irrigation applied
  • Provide advice on management changes to improve irrigation efficiency and effectiveness
SCHEDULING ORDER FORM

Please note emailed reports require rainfall and irrigation records emailed to This email address is being protected from spambots. You need JavaScript enabled to view it. and broadband is an advantage.

TERMS AND CONDITIONS: Payment must be made by the 20th of the month following the date of the invoice, unless prior arrangement for extended credit has been made. Interest of 18% will be charged monthly on overdue accounts. Debt collection will be taken at the discretion of HydroServices Limited after 60 days. This cost will be added to your account. Any instructions received by HydroServices from the client for the supply of our services, shall constitute acceptance of the temrs and conditions contained above.