Productivity of an ultra-continental steppe was determined at the Tuva study site from 1978 to 1985. Measurement of monthly dynamics of above-ground plant biomass were made for each growing season (May-August). Cumulative above-ground net primary production was estimated for some years. These data are part of a series of grassland data sets recently assembled and checked by Dr. Tagir Gilmanov, ... which cover a wide range of climate and "continentality" (increasing maximum summer temperatures, decreasing precipitation) from the North-West to the South-East of the Commonwealth of Independent States (former USSR). Climate data for this site are also available: see Any Other Relevant Information in section 11 of this document. More information on the entire Net Primary Production Project can be found at the NPP homepage.