Preliminary Tests are multiple-row plots with two replications. Coefficients of variability are included with all replicated test data.
Discretion is used in including data with high CVs in the regional means.
If the CV is greater than 15, participants should include the reason, such as disease or environmental conditions. Lines may be heterogeneous for morphological traits the first year in the Uniform Tests but must be pure lines the second year of testing. It is the responsibility of the breeder to purify heterogeneous lines. Delayed leaf drop and green stems are not considered in assigning maturity. These maturity group ranges are based on long-term means over many locations.