Estimation of the above-below ground plant biomass amount in terrestrial ecosystems is one of the most important components of climatic change programs and global carbon cycle modelling. Biomass of plant is one of the significant subjects in the studies carried out on climatic changes. For that reason, plant biomass samples were taken from different areas and different plant species in Southeastern Anatolian Region (SAR). In this study, the net plant biomass production amounts were tried to be determined with geo-statistical modelling by evaluating the results of 2293 plant biomass samples taken from the region. For that purpose, Ordinary Kriging in ArcGIS software was used and mapped. In the study, when available land uses were evaluated, the most dominant product was noticed to be wheat. According to this, samples were taken from wheat, pasture, barley, lentil, cotton and corn areas. In this study, samples were taken from 2293 points. The most sampling was performed from the areas of wheat agriculture. Average surface ground NPP amount varied between 154.66 and 1237.74 g m(-2), and the highest amount was determined in corn plant. Average under-soil NPP amounts were determined in wheat with 149.36, in barley with 63.31, in lentil with 55.90, in pastures with 41.41, in cotton with 172.73, and in corn with 437.66 g m(-2). For the analysis of the data, SPSS 10.0 statistical software was used, and the data were analysed at the level of p < 0.01-0.05.