Hoshmand (2006) described a split plot design to test grain yield of corn with respect to corn hybrids (split plots) and nitrogen (in whole plots). The experiment was replicated at two blocks.
data(corn)A data frame with 40 observations on the following 4 variables.
yieldCorn yield in bushels per acre.
hybridType of hybrid, P = pioneer, levels were: A632xLH38 LH74xLH51 Mo17xA634 P3732 P3747.
NNitrogen addition in lbs/acre 0 70 140 210.
blockA blocking factor with levels 1 2.