Performance of F1 Hybrids in the Lower Rio Grande Valley

C. G. Cook, L. N. Namken


Field studies were conducted in 1993 at Weslaco, TX to evaluate 42 first generation (F1) cytoplasmic male sterile-restorer cotton hybrids for various yield components, lint yield, and fiber quality. Deltapine 50 and Stoneville 132 were used as commercial checks. The top 10 yielding hybrids had more seedling vigor, cold tolerance, and produced greater first and total harvests than the commercial checks. Five of the 10 had less damping-off. In addition, 23 of the hybrid combinations produced significantly greater lint yields than Deltapine 50, while 36 combinations produced more lint than Stoneville 132. The hybrids generally had a greater lint percent, first harvest and total lint yield, while requiring fewer days to first bloom and crop maturity. Results indicated fiber strength and micronaire values of the hybrids were in the acceptable range and generally equal to Deltapine 50 and Stoneville 132; however, fiber length of Stoneville 132 was shorter than the 10 hybrids and Deltapine 50. Seven of the 10 top yielding hybrids were produced with near-identical fertility-restoring male parents. This genetic background was also in the parentage of the top yielding hybrids grown in 1992 and appears to be a superior and stable fertility-restoring parent for use in hybrid cotton production systems. Development of improved fertility restorer lines and identification of superior hybrid combinations continues to demonstrate the advantages of maximizing heterosis.

Reprinted from Proceedings of the 1994 Beltwide Cotton Conferences pp. 674 - 675
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998