Samples of six cotton cultivars grown in three environments in 1977 and 1978 were harvested 26 days postanthesis and at 6-day intervals thereafter until boll opening to obtain samples of four boll ages. Fiber fineness and maturity data were compared with mechanical properties from samples that were untreated, mercerized slack, and mercerized under tension. Micronaire reading, wall thickness, linear density, and cross-sectional area increased with boll age. In untreated samples there was no consistent pattern of change in tenacity with boll age, but for all three treatments load-to-break for individual fibers increased with boll age. The 26-day-old fibers had thinner walls, higher x-ray angles, and a lower degree of crystallinity than the older fibers.
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