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Stable Statistics for Cotton Varieties Grown in the Midsouth, Southeast, North and Texas From 1993-1995

G.O. Myers and F. Bordelon


 
ABSTRACT

Yield and yield stability are separate but important considerations in the selection of which variety, by producers, to plant and to plant breeders in their variety development programs. Historically, yield has been the focus of most varietal comparisons and only in the last few years have stability (genotype x environment interaction) analyses started to appear in State variety trial summary publications. The recent integration of these two measures of performance into a yield-stability statistic (YSi) that provides a single selection criterion may facilitate varietal selection to the benefit of both producers and plant breeders. An additional benefit may arise from considering varietal performance in a regional context rather than on a state by state basis. State cotton variety yield trial test results from 10 states over the years 1993-1995 were grouped according to production region (MidSouth, Southeast, North, Texas) and YSi statistics calculated to identify varieties with a superior combination of yield and yield stability. The ANOVA indicated highly significant differences between environments in all four regions and highly significant genotype differences in all regions except Texas. Only in the Southeast and MidSouth was the genotype x environment interaction significant. Stability variance was significant only for STV 132 in the MidSouth, Southeast and Texas; Hyperformer HS-46 in the MidSouth and Texas; DPL 5415 in the MidSouth; and Georgia King in the Southeast. The most stable genotypes across all four regions were DPL 5690 and DPL 51. Varieties with the highest YSi statistics across all four regions were STV LA887, SG 125, SG 501, DPL 51, SG 404, DPL 20 and DPL 5690.



Reprinted from Proceedings of the 1997 Beltwide Cotton Conferences pp. 464 - 466
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998