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have the highest boll set and account for the majority of the yield. A change in boll distribution was noted when Early cotton (Gossypium hirsutum L.) planting in the Texas Coastal the growing season was characterized by lower tempera-Bend has the potential for improved performance through drought ture, less solar radiation, and higher precipitation amounts avoidance. This 2-yr field study was conducted to compare the effect of boll position on fiber properties across planting dates and to determine (Jenkins et al., 1990). how flowering date, boll position, and environmental factors affect During the first week after anthesis, fiber and outer fiber quality. Cotton ('Deltapine 5409') was planted early March, late integuments receive the greatest portion of photosyn-March, and mid-April each year. In 1997, lint yield for the early plantthate. After that, the distribution of photosynthate being date (731 kg ha Ϫ1 ) was significantly higher than the middle (622 tween the remainder of the seed and fiber is about equal. kg ha Ϫ1 ) and late (533 kg ha Ϫ1 ) planting dates. No significant differ-Fiber elongation begins 2 d after anthesis and continues ences in yield were found in 1999. Boll distribution patterns for middlefor an additional 3 to 4 wk. Around 15 d after anthesis, and late-planted cotton were similar. In 1997, the drier of the 2 yr, the deposition of a mainly cellulosic secondary wall befiber length and micronafis values increased at all boll locations with gins (Stewart, 1986). The degree of secondary-wall deearliness of planting while in 1999, the longest and most mature fiber position determines fiber maturity. Micronaire is a comwas associated with a number of boll locations in the middle planting date. High temperatures before and during boll development accom-posite measure of maturity and fiber fineness since fiber panied by adequate moisture increased fiber maturity.

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