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In wheat, rate and duration of dry matter accumulation and remobilization  depend on genotype and growing conditions. The objective of this study was to  determine the most appropriate polynomial regression of stepwise regression  procedure for describing grain filling period in three winter wheat  cultivars. The stepwise regression procedure showed that grain filling is a  complex biological process and that it is difficult to offer a simple and  appropriate polynomial equation that fits the pattern of changes in dry  matter accumulation during the grain filling period, i.e., from anthesis to  maximum grain weight, in winter wheat. If grain filling is to be represented  with a high power polynomial, quartic and quintic equations showed to be most  appropriate. In spite of certain disadvantages, a cubic equation of stepwise  regression could be used for describing the pattern of winter wheat grain  filling

Characterization of vegetative and grain filling periods of winter wheat by stepwise regression procedure. II. Grain filling period