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Improvement of Time‐Driven Models of Lamina Cocksfoot Digestibility by a Process‐Based Model to Take Account of Plant N Nutrition and Defoliation

For management purposes, models of lamina digestibility (D w ) that are thermal time driven (T sum ) fail to account for plant nitrogen status (0 < Ni < 1) and defoliation intensity (residual sheath height: S r ). The objective of this paper was to enrich them using a functional processed-based model, which assumes that the decline in D w over time depends on the metabolic: structural tissue ratio and plant ageing. An experiment combining two N fertilizer rates and two defoliation regimes (differences in S r ) for two spring and two summer regrowth was done to analyse D w of laminae (youngest fully expanded) and tiller (whole green lamina) levels. For laminae, we show that both processes contribute to explain the decline in D w at a rate that depends on Ni but not on S r . For tillers, consistent results were found justifying the use of a simple model: D w = f(+Ni; -Ni x T sum ; -S r ). Two different databases (from experiment and commercial farms) were used for validation: RMSD varied from 35 to 49 g kg -1 . The process-based model strengthened the empirical model and improved the comprehensiveness of how management practices change D w . We used both models to create applications for reasoning yield in function of herbage mass in complement than in function of time.