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Article Dans Une Revue BioEnergy Research Année : 2016

A single and robust critical nitrogen dilution curve for miscanthus × giganteus and Miscanthus sinensis

Résumé

The sustainable development of miscanthus as a bioenergy feedstock requires optimizing its fertilizer inputs and, therefore, determining its nitrogen (N) requirements. The ‘critical nitrogen dilution curve’ is a powerful tool to characterize such N requirements; it relates the N concentration ([N]) in aboveground organs to their biomass, defining two domains depending on whether the N factor limits biomass growth or not. We aimed to develop such a tool in miscanthus. Using a rhizome N depletion strategy with green cutting pre-treatment over several years before the start of the experiment, we grew, in 2014, two cultivated species, Miscanthus × giganteus (M×g) and Miscanthus sinensis (Msin), at four fertilizer levels (0, 80, 160 and 240 kg N ha−1). We found a strong nitrogen fertilization effect. The shoot [N] decreased as the aboveground biomass increased in both species and in all of the treatments. [N] was strongly correlated with leaf/stem biomass ratio. The N treatments enabled the identification of the observed critical points, i.e. points with the maximum biomass (W) and the lowest [N], on each measurement date. These points could be fitted to the following critical dilution curve that was common between M×g and Msin: N concentration (Nc) (critical [N], g N kg−1) = 27.0 W −0.48 when W > 1 t ha−1 and Nc = 27.0 when W ≤ 1. This curve was validated by literature data, separated into N-limited or not-limited conditions. The similarity of the curves between the two species was due to compensation between leaf/stem biomass ratio and [N] in the stems. This curve is helpful to diagnose the crop N status and define the optimal fertilizer requirements of miscanthus crops.
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hal-01605076 , version 1 (02-10-2017)

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Paternité - Partage selon les Conditions Initiales

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Marion Zapater, Manuella Catterou, Bruno Mary, M. Ollier, Laura Fingar, et al.. A single and robust critical nitrogen dilution curve for miscanthus × giganteus and Miscanthus sinensis. BioEnergy Research, 2016, 10 (1), pp.115-128. ⟨10.1007/s12155-016-9781-8⟩. ⟨hal-01605076⟩
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