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New flexible sigmoid function
Most annual crops are determinate, and their growth stops once they reach physiological maturity. Existing growth equations are not able to describe this pattern because the maximum growth is used as their upper asymptote when time goes to infinity. Yin et al. (pp. 361-371) present a new equation, ‘the beta growth function’, that is uniquely suitable for predicting the determinate growth pattern. Various notable features of the equation are highlighted.
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