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A Yield-Related Measure of Earliness for Cotton, Gossypium Hirsutum L.¹

We propose a Production Rate Index (PRI) as a means of expressing crop maturity, or earliness for cotton (Gossypium hirsutum L.). The PRI values are judged to be generally more suitable than MMD values for earliness measures because they are yield-related; they express a production rate (i.e., amount produced per unit time). An example is given that compares the two measures applied to actual data.

Key Words: Crop maturity • Cotton breeding • Mean maturity date • Production rate index

² a Research. Agronomist and Research Geneticist, respectively; Southern Region, Agricultural Research Service, USDA, Texas A&M University Agricultural Research and Extension Center at Lubbock, Texas 79401.

Received for publication December 2, 1972.

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