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Agricultural Drought: Crop Table

Agricultural Drought: Crop Table#

Overview#

A table of crop-specific information is needed for the calculation of ET0 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).

Tip

Workflow users are invited to edit the crop table to add other crops or modify the exisiting parameters with local data. In particular, the present data on the crops’ growing period (LGP, season start and season end) have a coarse resolution due to the large extent of the thermal climate zones and can be made more accurate replacing them with local values.

Accessing the table#

The crop table (partially displayed below) is available as a CSV file in the workflow folder of the repository. It can be loaded in Python with the pandas library or opened with a spreadsheet application like Microsoft Excel.

import pandas as pd

pd.read_csv("crop_table.csv")
FAO_Code Crop Clim Kc_in Kc_mid Kc_end lgp_f1 lgp_f2 lgp_f3 lgp_f4 Season start Season End RD1 RD2 DF Type Ky
0 111 wheat 2 0.7 1.15 0.30 0.125000 0.208333 0.416667 0.250000 135.0 255 0.2 1.25 0.55 1 1.0
1 111 wheat 3 0.7 1.15 0.30 0.111111 0.333333 0.388889 0.166667 319.0 134 0.2 1.25 0.55 1 1.0
2 111 wheat 4 0.7 1.15 0.30 0.477612 0.223881 0.223881 0.074627 289.0 259 0.2 1.25 0.55 1 1.0
3 111 wheat 5 0.7 1.15 0.30 0.111111 0.333333 0.388889 0.166667 336.0 151 0.2 1.25 0.55 1 1.0
4 111 wheat 7 0.4 1.15 0.30 0.477612 0.223881 0.223881 0.074627 320.0 290 0.2 1.25 0.55 1 1.0
... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ...
79 122 sweet_potato 3 0.5 1.15 0.65 0.133333 0.200000 0.400000 0.266667 91.0 241 0.2 1.25 0.65 1 1.0
80 122 sweet_potato 4 0.5 1.15 0.65 0.133333 0.200000 0.400000 0.266667 121.0 271 0.2 1.25 0.65 1 1.0
81 122 sweet_potato 5 0.5 1.15 0.65 0.133333 0.200000 0.400000 0.266667 121.0 271 0.2 1.25 0.65 1 1.0
82 122 sweet_potato 7 0.5 1.15 0.65 0.133333 0.200000 0.400000 0.266667 121.0 271 0.2 1.25 0.65 1 1.0
83 122 sweet_potato 8 0.5 1.15 0.65 0.133333 0.200000 0.400000 0.266667 121.0 271 0.2 1.25 0.65 1 1.0

84 rows × 17 columns

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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