The sample size of Y1∼Y5, z for each field experimental plot on Psathyrostachys juncea Nevski.

a100-seed was taken as one sample, at a seed water content of 7∼10%, then 10 of the 100-seed sample in each plot were averaged to obtain one sample of seed weight (Y5) of the plot; the total sample size (n) of Y5 = 10×105 = 1050 in 2003.bTotal sample size (n) = Sample size of plots (N) × Sample size of each plot (n), e.g., the number of spikelets fertile tiller-1 from 36 fertile tillers in each plot in 2003 was counted, then averaged as spikelets fertile tillers-1 (Y2) of the plot, so, the total sample size (n) of Y2 = 105×36 = 3780.