Characterization of the Ist and IInd group of cereals Ist group:- groove (rýha) is on the bottom side of the kernel - hollow stalk- lesser demands for warmth, higher demands for moisture- winter and spring forms- rapid initial development - they need long day (14 - 16 hours) for formation of generative organs (ears)IInd group:- kernel is without groove- stalk is filled by the pith (dřeň)- higher demands for warmth, lesser demands for moisture- only spring forms- slow initial development - they n...