It is an approach whereby plants are supplied with nutrients based on their inherent spatial and temporal variability, and that SSNM is an approach which enables plant nutrients to be supplied at the best time and place for them. SSNM uses a variety of tools including remote sensing, GPS, GIS systems, VRT, yield monitoring as well as different tools of SSNM. As a result of the invention of the SSNM system, it has now become possible to apply prescription fertilizers throughout a field and manage soil nutrient variations throughout the field. Despite the fact that farmer's fields exhibit significant heterogeneity in terms of their ability to supply nutrients and their crops' responses to nutrients, fertiliser application recommendations are frequently based on crop response data averaged across wide areas. Therefore, general advice for fertiliser application may cause farmers to apply too much fertiliser in some places and not enough in others, or to apply the wrong balance of nutrients to their soil or crop. In contrast to blanket guidance, Site-specific Nutrient Management (SSNM) is a method meant to optimize soil nutrients to match the crop needs over time and space, following four key principles in order to achieve this. Remote sensing-based nutrient stress detection and data integration in a GIS can support site-specific fertiliser and soil amendment treatments. Thus, fertilizer usage efficiency would be increased as a result, along with nutrient losses being reduced.