Electrical conductivity and elevation mapping
Soil electrical conductivity mapping using the Veris 3100 conductivity instrument.
Through our reseach, we have found that soil conductivity is a valuable layer of information on the soil resource and its influence on the yield variability that is shown in crop yield maps. Soil conductivity mapping at a similar scale to crop yield mapping is proving to be very usefull in the interpretation of crop yield maps, directing the location of soil testing to minimise the required number of samples and in helping to delineate different management zones within paddocks.
Some information on how the Veris 3100 works and a look at the data available from a conductivity survey should provide a useful background to those considering this service.
Paddock elevation mapping using survey-grade differential global positioning system (DGPS) receivers.
Our research has also shown that mapping paddock elevation provides another valuable insight into the yield variability that is shown in crop yield maps. Elevation and slope has a direct influence on soil forming processes and on soil water movement within a paddock. Relative elevation may also be important in soil water storage patterns and micro-climate variability (e.g. frost hollows or decreased incidence of solar radiation). Normally, elevation mapping need only be performed once using high quality DGPS unless changes to a paddock level are made.
This service can be provided at the same time as a conductivity survey or performed separately.
Take a look at some examples of yield, elevation and conductivity maps.