Abstract
The expanded growth model has been used to simulate biomass accumulation with time by elephantgrass (Pennisetum purpureum Schum.) grown in Florida. It has been used to describe partitioning of biomass between stem and leaf components of the plant as well as total biomass accumulation with time. The linear relationship between biomass (Y) and the growth quantifier (Q) has been confirmed. Large biomass accumulation by elephantgrass is explained by the wide spread (σ=13.6 wk) in the solar driving function and the low value of the aging coefficient (c=0.05 wk−1). Partitioning of biomass between stem and leaf components is accounted for in the growth quantifier by partitioning Q into a component for stem (Q S ) and a component for leaf (Q L ). This allowed fine‐tuning of estimates of parameters c and the partition coefficient k. Analytical functions contained in the model are easily evaluated, as illustrated in the procedures.
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