Variable	Description
Ring		Plot number at NDFF (1-9)
Depth    	soil depth sample was obtained
%Sieve 		% of sample retained by 62.5 um sieve
%Finer 		% of sample passed through 62.5 um sieve. Fraction used for 
		lazer Digisizer analysis.
%>62.5um	Sand fraction of sample, %Sieve + fraction determined to be
		>62.5 um by lazer Digisizer.
%15um		Coarse Silt fraction determined to be between 62.5um and 15 um
		by lazer Digisizer.
%3um 		Fine Silt fraction determined to be between 15um and 3um by 
		lazer Digisizer.
%<3um		Clay fraction determined to be less than 3um by lazer Digisizer.


Methods:  Soil fractions of samples collected at NDFF([NDFF_Soil_Texture.xls]) in 1997 before CO2 treatment commenced.  Samples were processed through 62.5 um sieve to remove sand fraction then analysized for fine soil particle size on Micromeretics Saturn DigiSizer 5200.(see  http://soilslab.dri.edu/instrument_dig.htm)
Contributed by:
S.Zitzer