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Published in Crop Sci 6:527-531 (1966)
© 1966 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Morphological Measures of Earliness of Crop Maturity in Cotton1

L. L. Ray and T. R. Richmond2

Certain features of the gross morphology of the cotton plant furnish clues to earliness of crop production. Three such features — (1) node of first fruiting branch (NFB), (2) number of vegetative branches (NVB), and (3) percentage of bolls on vegetative branches (PBV) — were used as morphological measures of earliness in the studies reported here. All of the morphological measures were significantly correlated but, because of its higher heritability and lower variability, NFB is considered the most reliable and the most practical one of the three. NFB and NVB were signficantly correlated, phenotypically, with product-quantity measures of earliness. Mean maturity date (MMD), a product-quantity measure, and NFB, a morphological measure, are separate estimates of the same phenomenon: i.e., earliness of crop maturity. Used together, they are mutually supporting and they form a reliable basis for estimating earliness in genetic studies and breeding programs.

1 Contribution from the Texas Agricultural Experiment Station (South Plains Research and Extension Center, Lubbock, Texas), Texas A&M University in cooperation with the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture. Taken in part from material submitted by the senior author in partial fulfillment of requirements for the Ph.D. degree at Texas A&M University.

2 Associate Agronomist, South Plains Research and Extension Center, and Research Agronomist, Crops Research Division, ARS, USDA, (Professor of Agronomy, Texas Agricultural Experiment Station).

Received for publication April 29, 1966.


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