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72 5 Designs with several error terms5.4 PracticalSpreadsheet file Rice.gsh containsdata from an experiment that studied theeffect of three levels of nitrogenfertilizer on the yields of six varieties ofrice (Gomez & Gomez, 1984, StatisticalProcedures for Agricultural Research,page 110).The experiment used a strip-plotdesign. This is a replicated row andcolumn design. Each replicate had threecolumns and six rows. Within eachreplicate, the nitrogen levels wererandomized onto the columns, and thevarieties were randomized onto therows. So the block structure isRep / (Row * Column)and the treatment structure isVariety * NitrogenAnalyse the yields.Figure 5.3