Advanced fiber information system (AFIS) fiber length by weight as a function of seed position for two irrigation treatments (4.32 and 6.33 mm.d−1) in Lamesa, TX, in 2006 and 2007. First sympodial position. a,b denote the mean differences between seed position within irrigation treatments. A, B denote the mean differences between irrigation treatments within seed position. Means with same letter are not significantly different at P = 0.05 level.