| Soil Moisture Probes are
installed to measure the level of moisture in the soil
profile. The EnviroPro probes used at the BIGG sites are
80cm long and fitted with 8 sensors, spaced 10cm apart. |
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| The head of the probe is buried 10cm below the soil surface. The effective measurement depths are then 15, 25, 35 to 85cm. Setting the probe below the surface does however mean that no reading is provided in the top few cm of the profile. In an irrigated cropping situation, monitoring at 10cm is a must. But in a dryland situation, the moisture in the top 10cm is used very quickly and will not play a major part in management decision-making. | |
| The ‘Soil Moisture – Separate Graph’ is quite informative, as it shows with considerable resolution, where in the profile water is being held and where it is being used. It is also very useful in finding out how deep in the profile a rain event has penetrated. | |
| Compared to the ‘Soil Moisture – Separate Graph’, a more intuitive view is the ‘Stacked Soil Moisture Graph' For a ‘Stacked Soil Moisture Graph' the lines for individual sensors are positioned in depth order (i.e. the line for the shallowest sensor (e.g. 15cm) is always at the top of the screen and the line for the deepest sensor (e.g. 85cm) is always at the bottom). This presentation makes the graph very easy to read, but the downside is that the vertical resolution is reduced. | |
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