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GRAIN AND OIL CROPS

Guidelines for Comparisons among Different Maize Maturity Rating Systems

^a Agric. & Agri-Food Canada, Eastern Cereal & Oilseed Res. Ctr., Ottawa, Ontario, K1A 0C6, Canada
^b Pioneer Hi-Bred Int., Plant Breeding Div., Willmar, MN, 56201 USA

dwyerl{at}em.agr.ca

Several systems are extensively used to rate maize (Zea mays L.) maturity in North America, including growing degree days, crop heat units, and Minnesota relative maturity rating days. Correspondence between the different systems varies with the temperature range of the environment, because of different bases of calculation and unit size. However, general guidelines for conversion from one system to another would aid communication among researchers, producers, distributors, and extension personnel, particularly where regional preference for one system exists, but information developed in another region is shared. Simple regression equations were developed from a data set with 4 years, 28 hybrids, and 19 locations (between 39° and 48° N lat). Coefficients of determination were 0.91, indicating that these equations could be used as a general guideline to compare maturity ratings developed using the different systems.

Abbreviations: CHU, crop heat units • GDD, growing degree days • GTI, general thermal index • MRMR, Minnesota relative maturity rating

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