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Yield Response of Six Cultivars of Upland Cotton, Gossypium hirsutum L., in Two Cultural Regimes¹

Six cotton (Gossypium hirsutum L.) cultivars grown in yield trials from 1935 through 1938 were again evaluated in 1967 and 1968. Yields in the latter period were 61% greater than those in the earlier period, but two varieties responded more favorably than did the other four. A yield model, lint yield = bolls/m² x seeds/boll x lint/seed, was used to assess the response of the cultivars to changes in cultural inputs. The two varieties that responded more favorably to improved production practices produced more bolls/m² relative to the other four. The other two components did not change appreciably. It was concluded that the ability to produce more bolls/m² under increased input levels must have been a factor in selection of germ plasm.

Key Words: Yield model • Components of yield • Cultural inputs

² Research Geneticist, PSRD, ARS, USDA, Beltsville, Md. 20705.

Received for publication November 6, 1971.

This article has been cited by other articles:

				B. M. Schwartz and C.W. Smith Genetic Gain in Yield Potential of Upland Cotton under Varying Plant Densities Crop Sci., March 19, 2008; 48(2): 601 - 605. [Abstract] [Full Text] [PDF]