Maximum/minimum sucrose, maximum callose and final cellulose contents in cotton fiber and their analysis of variance under the coupling of planting date and shading in 2010 and 2011.

DW, dry weight; Values followed by the different letters within a column are significantly different at 0.05 probability level; CVS was calculated from the data of three shading treatments in normal planting date of 25 April; CVP was calculated from the data of three planting dates and CVP×S was calculated from the data of all treatments; * and ** mean significant difference at 0.05 and 0.01 probability levels, respectively; NS means non-significant differences.