Plant quality seasonality and sheep grazing in an alpine May 01 2011· All plant tissue were grounded and homogenized 1 mm sieve size by a plant mill Culatti type DFH48 This yielded a uniform powder of plant mass that was dried 60 °C for 48 h before subsamples were added to pre weighed Zn capsules for C and N analysis by combustion in Flash EA 1112 automatic elemental analyzer Thermo Finnegan Milan