The files in this subdirectory ("pub/ndp037/IBSNAT")
provide data for a number of parameters, including all of the
carbon dioxide enrichment response measurements, plus daily weather, 
soil profile properties (e.g., initial soil moisture and nitrogen 
conditions), and irrigation and fertilizer treatments.  The file 
structures of these data conform to the International Benchmark 
Sites of Agrotechnology Transfer (IBSNAT) standards, developed in 
1986 by plant growth modelers for crop model input and output 
files. 
     Persons interested in using these IBSNAT-formatted data files
are advised to consult "suppl.wp," a Word Perfect 5.1 file provided
in the subdirectory "pub/ndp037" and also included as part of the
written documentation of NDP037, available upon request from CDIAC.
This supplemental text provides detailed descriptions of the contents
and formats of the IBSNAT-formatted data files.
     Within this subdirectory ("pub/ndp037/IBSNAT"), the IBSNAT-
formatted data files are provided in subdirectories denoting the 
experiment year (i.e., "pub/ndp037/IBSNAT/1983," "../IBSNAT/1984,"
"../IBSNAT/1985," ".. /IBSNAT/1986," and "../IBSNAT/1987").  An
additional subdirectory, "pub/ndp037/IBSNAT/retrieval," provides a 
FORTRAN retrieval code ("retrvl.for") developed by G. W. Wall and 
M. L. Reaves (U.S. Water Conservation Laboratory, Phoenix) to 
facilitate use of these data.  The subdirectory "pub/ndp037/IBSNAT/
retrieval" also includes a "readme" file that explains the use of
the retrieval code.