Volume l is made up of 176 pages in an A4 loose ring binder with full colour figures.  
 
The Tetrazolium Working Sheets Volume I includes detailed and standardised description to conduct and evaluate tetrazolium tests for the determination of viability from forest and shrub seed.
  
The working sheets present 120 agricultural, in as much as the testing of the species took place similar. The description is illustrated with pictures of the seed morphology, the cutting instructions and the different stages of non-viable seeds. The working sheets support the 'International Rules for Seed Testing' by providing detailed working plans to the seed testing laboratories. This publication is a result of the experiences of the daily routine work of a seed testing laboratory and the optimisation of competent members of the ISTA Tetrazolium Committee from all over the world. The Tetrazolium Working Sheets contribute perfectly to one of the main aims of ISTA: Harmonization in international seed testing.