The experiments were harvested and seed cotton ginned on a 20-saw laboratory gin. A 40 g lint sample was used for fibre quality testing on a HVI 1000 (USTER® Technologies Inc., USA) and Shirley FMT-3 (Shirley Developments Ltd., England). Fuzzy seed index was determined by weighing 100 seeds; lint index was determined as the weight of lint from 100 seeds. Upper half mean length (mm), length uniformity and micronaire (presumed μg in.−1) were measured by HVI; fineness (μg m−1) and fibre maturity ratio were measured by FMT.
FPSmic and FPSfin were calculated as follows with common units of g and m.