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70 5 Designs with several error termsyield of a forage crop. The main-plot treatment is Cutdate (D1-4 on the plan), and theindividual plots of the square have been split into pairs to allow for the two Nitrogentreatments (0 and 0.3). The subplot factor is nested below the usual block formula for aLatin square(Rows * Columns) / Subplots= Rows + Columns + Rows.Columns + Rows.Columns.Subplotsto give an extra stratum Rows.Columns.Subplots to represent the variation of thesubplots within the plots of the Latin square.The data are in spreadsheetfile Forage.gsh, and thevariate to be analysed is theyield of forage.Again, the two-way table ofmeans has two s.e.d's dependingon the level of the factor thatwas applied to the plots of thedesign.Figure 5.2Analysis of varianceVariate: YieldSource of variation d.f. (m.v.) s.s. m.s. v.r. F pr.Rows stratum 3 87.603 29.201 0.81Columns stratum 3 110.181 36.727 1.02Rows.Columns stratumCutdate 3 23019.485 7673.162 212.53