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Crop Table

Crop Table#

This document describes the table with all the crop-specific information needed for the ET0 calculation performed in the hazard assessment. The parameters presented in the table are:

  • Kc: crop coefficient (dimensionless) used to scale the reference evaportanspiration (ET0) to a specific crop. Three values are provided to reflect three growing stages of the plant: initial (Kc_in), medium development (Kc_mid), maturity (KC_end). Sourced from Chapagain and Hoekstra (2004)

  • LGP: length of growing period, here expressed as a fraction of 1 year (365 days). Four phases are identified: initial growth, crop development, maturity, decay. Sourced from Chapagain and Hoekstra (2004).

  • Season start and end: sowing and harvest day of crop, sourced from Chapagain and Hoekstra (2004).

  • RD: rooting depth (m), sourced from Allen et al., (1998).

  • Type: annual (1) or perennial (2).

  • DF: depletion factor, representing the fraction of readily available soil water (Allen et al., 1998).

  • Ky: crop water-yield response factor. Values sourced from (Doorenbos et al., 1979).

The Kc and length of growing period data are specific to different climate zones and sourced from Chapagain & Hoekstra (2004). According to the FAO classification, the thermal climate zones present in the continental EU territory are: Subtropics summer rainfall (2), Subtropic winter rainfall (3), Oceanic temperate (4), Sub-continental temperate (5), Boreal oceanic (7) and Boreal subcontinental (8).

The crop table (partially displayed below) is available as a .csv file in the workflow repository. The user is invited to edit the table adding other crops or modifying the exisiting parameters with local data. In particular, the present data on crops growing period (LGP, season start and season end) have coarse resolution due to the large extent of the thermal climate zones and can be made more accurate replacing them with local data.

Contributors#

Euro-Mediterranean Center on Climate Change (CMCC), Italy.

Author: Andrea Rivosecchi

References#

  • Allen, R.G., Pereira, L.S., Raes, D. & Smith, M. (1998) Crop evapotranspiration-Guidelines for computing crop water requirements-FAO Irrigation and drainage paper 56. Fao, Rome. 300 (9), D05109.

  • Chapagain, A.K. & Hoekstra, A.Y. (2004) Water footprints of nations. Value of Water Research Report Series, no. 16, Unesco-IHE Institute for Water Education, Delft.

  • Doorenbos, J. & Kassam, A.H. (1979) Yield response to water. Irrigation and drainage paper. 33, 257.

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