Is crop N demand more closely related to dry matter accumulation or leaf area expansion during vegetative growth

By G. Lemaire, Erik van Oosterom, J. Sheehy, Marie Hélène Jeuffroy, A. Massignam, L. Rossato. 2007

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The challenge of improving nitrogen use efficiency in crop plants: towards a more central role for genetic variability and quantitative genetics within integrated approaches. (2007, background): “In potato, the leaf area is reduced and adjusted to the rate of N uptake, keeping the plant leaf-specific nitrogen (g Nm2) and RUE unchanged (‘potato strategy’).”
Raising yield potential of wheat. III. Optimizing partitioning to grain while maintaining lodging resistance. (2011, background): “Changes in leaf area are primarily determined by fertilizer N use (Lemaire, 2007), so the optimum leaf canopy (Sylvester-Bradley et al.”
Breeding for increased nitrogen‐use efficiency: a review for wheat (T. aestivum L.) (2016, background): “Typically, as WU increases, WUE decreases because WU scales to biomass (Blum 2009), as does N absorption (Lemaire et al. 2007, Sadras and Lemaire 2014).”
Quantifying crop nitrogen status for comparisons of agronomic practices and genotypes (2014, background): “If we assume that Wm increases allometrically with W (Niklas, 1994; Lemaire and Gastal, 1997; Lemaire et al., 2007; Lemaire et al., 2008) then”
Nitrogen economy in relay intercropping systems of wheat and cotton (2008, methodology): “In many crops, N uptake is related with the accumulation of biomass and growth of leaf area over time (Booij et al. 1996; Lemaire et al. 2007).”