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Nitrogen deficiency

Nitrogen deficiency is indicated as soon as the crop’s tissue N concentration falls below the critical N concentration. The respective reduction factor results from:

\[\zeta_N = 1-e^{N_m - \left( 5\cdot \frac{N_{act} - N_m} {N_{crit} - N_m} \right)}\]

\(\zeta_N\) Reduction factor N stress
\(N_m\) Minimum N concentration in the plant tissue \([kg \, N \, kg \, TM^{-1}]\)
\(N_{act}\) Actual N concentration in the plant tissue \([kg \, N \, kg \, TM^{-1}]\)
\(N_{crit}\) Critical N concentration in the plant tissue \([kg \, N \, kg \, TM^{-1}]\)

Figure 1: Reduction function for N stress in relation to the actual N concentration of the above-ground biomass. \(N_{crit}\) = critical N concentration.

In the case of stress due to drought or nitrogen deficiency, acceleration of ontogenesis is assumed for some developmental stages.

References

  • Challinor et al. (2005): Simulation of the impact of high temperature stress on annual crop yields. Agricultural and Forest Meteorology 135, 180 - 189.

  • Mirschel, W. & Wenkel, K.-O., 2007. Modelling soil-crop interactions with AGROSIM model family. In: K.C. Kersebaum, J.-M. Hecker, W. Mirschel and M. Wegehenkel (Editors), Modelling water and nutrient dynamics in soil crop systems. Springer, Stuttgart, pp. 59- 74.

  • Moriondo et al. (2011): Climate change impact assessment: the role of climate extremes in crop yield simulation. Climatic Change 104 (3-4), 679-701.