Assessing fiber quality variability among modern upland cotton cultivars and incorporating it into the GOSSYM-based fiber quality simulation model
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Background
GOSSYM is a mechanistic, process-based cotton model that can simulate cotton crop growth and development, yield, and fiber quality. Its fiber quality module was developed based on controlled experiments explicitly conducted on the Texas Marker-1 (TM1) variety, potentially making its functional equations more aligned with this cultivar. To assess the model's broader applicability, this study analyzed fiber quality data from 40 upland cotton cultivars, including TM1. The measured fiber quality from all cultivars was then compared with the model-simulated fiber quality.
Results
Among the 40 upland cultivars, fiber strength varied from 28.4 cN·tex −1 to 34.6 cN·tex −1 , fiber length ranged from 27.1 mm to 33.3 mm, micronaire value ranged from 2.7 to 4.6, and length uniformity index varied from 82.3% to 85.5%. The model simulated fiber quality closely matched the measured values for TM1, with the absolute percentage error (APE) being less than 0.92% for fiber strength, fiber length, and length uniformity index and 4.7% for micronaire. However, significant differences were observed for the other cultivars. The Pearson correlation coefficient ( r ) between the measured and simulated values was negative for all fiber quality traits, and Wilmotts’s index of agreement (WIA) was below 0.45, indicating a strong model bias toward TM1 without incorporating cultivar-specific parameters. After incorporating cultivar-specific parameters, the model’s performance improved significantly, with an average r -value of 0.84 and WIA of 0.88.
Conclusions
The adopted methodology and estimated cultivar-specific parameters improved the model’s simulation accuracy. This approach can be applied to newer cotton cultivars, enhancing the GOSSYM model’s utility and its applicability for agricultural management and policy decisions.
