Source of variation	Degrees of freedom
Total	343
Correction for the mean	1
Replicate or block	6
Genotype	258
Check	13
New	244
Check versus new	1
Check × block	78
Row linear within block	7
Column linear within block	7
Row linear × column linear within block	7
Row quadratic within block	7
Column quadratic within block	7
Row quadratic × column quadratic within block	7
Row cubic within block	7
Column cubic within block	7
Residual or error	22