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cultivated saltbush There are plants that indicate that there is a salinity problem with your soil. Some plant species can tolerate high salt concentrations and grow in these areas while others can only live in lower concentrations. Zones or concentric circles of plants can be seen in some areas indicating a change . . . → Read More: Are there visual indicators of Salinity problems? This is some salt scald areas of Grant Wardle’s Straithairlie farm near Boyup Brook in Western Australia. Salinity affects nearly 50% of farmed land in WA. Note how the salt at the surface has eliminated most of the vegetation except for some hardy, salt-tolerant grasses. Grant’s challenge was how to restore vegetation along . . . → Read More: Grant improved his long-term production through Salinity Mapping. measuring the water level in a standpipe with a piezometer A piezometer is a small-diameter observation well used to measure the hydraulic head of groundwater in aquifers. Similarly, it may also be a standpipe, tube, vibrating wire piezometer or manometer used to measure the pressure of a fluid at a specific location in . . . → Read More: What is a Piezometer? Unambiguous measurement of soil salinity can only be done on samples in the laboratory. Typically the chloride (Cl-) concentration on a dry weight basis is taken to be representative. However, sampling is destructive and the chloride content varies both spatially and with time. So, only with a large number of samples taken systematically under . . . → Read More: Can we measure soil salinity change? To solve salinity and other environmental issues we need to manage whole catchments, not just little parts. One town or one farm upstream can cause problems for others downstream. The satellite image shows a section of the Murrumbidgee catchment with three of it’s sub-catchments. Dark green/brown represents areas of remnant vegetation . . . → Read More: Salinity is a Water Catchment issue. Salinity, which has developed by changing land use and management, is called secondary salinity. It is caused by a change in the water balance, leading to more water in the soil and a rising watertable. This mobilises stored salts, which rise with the watertable towards the surface. Clearing for agriculture has been the major . . . → Read More: Secondary Salinity and it’s long-term effects. |
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