Abstract:

Field experiments with three spring wheats genotypes were carried out in Harbin in 2002 to study quantitatively the dynamic change of grain sedimentation test value affected by environmental factors including fertility and meterological condition. The results showed that the dynamic change of grain sedimentation test value with varied days after anthesis was well fitted with the third-order curve convex in shape. For different genotypes, the characteristics of their dynamic changes were different. Moreover, the differences of grain sedimentation test value between genotypes were varied during the period of grain filling. The dates corresponding to the curve peak values of the high protein-rich gluten genotype, the high protein—medium gluten genotype and low protein-poor gluten genotype were the 28th, 23rd and 30th day after anthesis, respectively. The dynamic change shapes of the accumulation velocity curves for grain sedimentation test value in different genotypes were responsible for their sedimentation values at mature period, which were the highest in high protein-rich gluten genotype, the medium in high protein-medium gluten genotype, and the lowest in low protein-poor gluten genotype.

Key words: Spring wheat, Grain sedimentation test value, Dynamic change, Fitting curve equation, Quantitative