Soil mapping is a key element to successfully implement Integrated Nutrient Management (INM) in high value crops.  SoilOptix^TM is a mapping service based on the use of gamma radiation technology that arrived in Chile in 2019. Since then, around 2000 ha have been mapped, mainly in fruit orchards and vineyards.

The technology has demonstrated its value in determining the most limiting factors in new and old orchards, and the possibility of correcting them in a site-specific manner.

The identified limiting factors (LF) have varied widely and have included low P values, excess Na, high salinity, copper toxicity, and low buffer capacity, among others.

Another important use for the technology is the site-specific estimation of N mineralization as well as the available N, and from them a better N balance and a proper estimation of the Nitrification Inhibitor (NI) rates.

Finally, for new orchard plantations, a zoning based on gamma radiation (counts per second) or texture, is a useful tool for irrigation design.