Abstract
A previous method of fitting a linear relationship between specific respiration and growth rates, due to Thornley et Hesketh and based on equating coefficients in polynomials, is extended. Two alternative methods are described; both use linear functional relationship techniques. All 3 methods are compared by Monte Carlo simulation. The linear functional relationship methods are substantially more accurate than the original method, although they are computationally more complicated. These methods also provide a choice of growth curve, a feature which is not available in Thornley et Hesketh''s method. Published data relating to cotton bolls are used to illustrate the different methods.

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