Electromagnetic soil surveys (EM) and variable rate irrigation are two tools that when used together can have maximum impact on your bottom line and allows for optimisation of the VRI system. On top of this, systems such as the Lindsay Precision VRI and FieldNET can produce a proof of placement map which can be used for analysis with other layers. This feature adds to the power of the EM-VRI combo……….

http://www.h2grow.nz/2016/06/fieldnet-and-em-surveying-ultimate.html