The changing amplitude (Δ%) of average activities of sucrose phosphate synthase (SPS), sucrose synthase (SuSy), acidic invertase (Acidic INV) and alkaline invertase (Alkaline INV) in cotton fiber during fiber secondary wall rapid-thickening (FSWR) under the coupling of planting date and shading in

Δ% = (Treatment-Control)/Control × 100%, control is the plot of 25 April + CRLR 100%.

Δ% = (处理组 - 对照组)/对照组 × 100%，其中对照组为4月25日的样地，且施加100%浓度的CRLR。