Future Water Requirements and Crop Productivity at Al-Najaf Governorate Under Different Climate Change Scenarios (2020–2080)

Sabah, Noor; Al-Mukhtar, Mustafa; Shemal, Khalid

doi:10.30684/etj.2023.137102.1335

	Future Water Requirements and Crop Productivity at Al-Najaf Governorate Under Different Climate Change Scenarios (2020–2080)
Engineering and Technology Journal
Article 8, Volume 41, Issue 5, 2023, Pages 687-697 PDF (682.94 K)
Document Type: Research Paper
DOI: 10.30684/etj.2023.137102.1335
Authors
Noor Sabah^* ; Mustafa Al-Mukhtar; Khalid Shemal
Civil Engineering Dept., University of Technology-Iraq, Alsina’a street, 10066 Baghdad, Iraq.
Abstract
This study aims to predict the effect of climate change on net irrigation water requirements (NIWR) and agricultural productivity from five common crops (wheat, barley, summer maize, and sorghum) in the Al-Najaf Governorate in Iraq. GFDL-ESM2M mode was used to predict the lower and upper temp and precipitation for two time periods (2020-2080) with 30 years for two periods (P1 and P2) under representative concentrations paths (RCP 2.5, RCP6, and RCP8.5). The CROPWAT model is used to determine NIWR, and the extreme learning model was used to estimate agricultural yields using previous crop yield production and weather data, supported vectors machine (SVM) is executed as a Machines Learns algorithm. Results showed NIWR increment to consider cropping owing to climate change. Barley is the crop most affected by climate change under the (RCP2.5, RCP6, and RCP8.5) scenarios, with increasing crop water requirements (NIWR) of (22%, 23%, and 24% ) for P1 and (23%, 24%, and 29%) for P2, respectively. Summer maize is the crop least affected by climate change under all climate change scenarios, with increasing crop water requirements of (1%, 2%, and 4%) for P1 and (1%, 2%, and 5% for P2. Climate change negatively affects the crop yield of all crops under the different climate change scenarios. The findings of this study could be used as a guide to developing adaptation strategies for dealing with potential changes in water availability and agricultural water productivity due to climate change.
Highlights
The effect of climate change on net irrigation water requirements and crop productivity was investigated. Barley has the most influence on climate change. An increase in the quantity of water required for irrigation for the common crops under climate change. Climate change has negative effects on all crops' yield under different climate change scenarios.
Keywords
AL-Najaf Governorate; Climate change; Crop productivity; Crop water requirements; Machine learning

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