Excerpt from Genetic Basis for Varietal Improvement of Pima Cottons
Varietal improvement of the extra-long staple cottons in the southwestern United States since 1911 have resulted in a much improved plant type, increased yield, improved fiber quality, and shortening of the fiber while maintaining a high level of yarn strength. Much of the change came about with the development of Pima 8-1 and has been extended with Pima 8-2, which was released in September 1960.
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