Dr. Theib Oweis is water resources planning and management scientist with over 40 years of experience in research, development, and capacity building. His expertise is in the management of water for agriculture, specifically water-scarce dry environments. 

His current research interests focus on water-use efficiency, water productivity, supplemental irrigation, water harvesting, and optimization of water use in agriculture to cope with climate change. He has authored over 200 journal articles, books and book chapters, and conference proceedings on these topics. Since joining ICARDA in 1991, he has advocated for water productivity and water-saving practices in agriculture.

He has also served as professor of irrigation and drainage engineering at the University of Jordan, distinguished guest professor at the Tottori University in Japan, and is founder of Dar-Arai Irrigation and Water Consulting in Jordan. 

Dr. Oweis is a member of several scientific associations, including the American Society of Civil Engineering and the Jordan Engineers Association. He is a recipient of a number of awards and honors for his contributions to the field. He received his Ph.D. in agricultural and irrigation engineering from Utah State University.

Theib Oweis's Publications

Managing Scarce Water Resources in the Drylands of West Asia and North Africa: Review of Joint Research between ICARDA and Japanese Researchers
The micro-catchment water harvesting-based rehabilitation ameliorated soil microbial abundance, diversity and function in a degraded dryland
Rehabilitation of degraded rangelands in Jordan: The effects of mechanized micro water harvesting on hill-slope scale soil water and vegetation dynamics
Digital Diffusion for Inclusive Agroecosystems
Book Chapter
November 28, 2018

The technological advancements in agriculture have resulted in higher yields but lower ecological efficiency and nutritional value. Little innovations in later sectors such as integrating ecological functions in the production systems have crippled...

Role of Sustainable Wheat Production to Ensure Food Security in the CWANA region
Improved On-farm Irrigation Management for Olive Growing - A Case Study from Morocco
Supplemental Irrigation: A Promising Climate-resilience Practice for Sustainable Dryland Agriculture
Improving wheat production in the CWANA region
Book Chapter
July 31, 2016

Wheat is the principal staple food in most countries of the Central and West Asia and North Africa (CWANA) region, accounting for 45% of the region’s per capita calorie intake with an average wheat consumption of about 200 kg/capita/year, which is...

Linking Selected Soil Properties to Land Use and Hillslope  – A Watershed Case Study in the Ethiopian Highlands
Supplemental irrigation potential and impact on downstream flow of Karkheh River Basin of Iran
Impact of Climate Changes on Water Resources Availability in the Orontes River Watershed: Case of Homs Governorate in Syria
تطبيق نظام القياسات المائية (WAS) ورفع انتاجية المياه في حوضي العاصي الاعلى والأوسط. WEAP modeling-based study of Water Accounting System and levels of water productivity in the Upper and Middle Orontes River Basin.
Journal Article
December 31, 2015

Freshwater used unsustainably in the upper and midmost Orontes basin (from Syrian - Lebanese borders to Rastan dam). In Syria country, water predicted to become scarce by 2020 due to demand continuing to grow in parallel with increased agriculture...

Priming effect of 13C-labelled wheat straw in no-tillage soil under drying and wetting cycles in the Loess Plateau of China
Selection and socio-economic and biophysical characterization of Gumara-Maksegnit watershed research site
Performance of improved practices in farmers’ fields under rainfedand supplemental irrigation systems in a semi-arid area of Pakistan
Assessment of the severity and impact of drought spells on rainfed cereals in Morocco
Assessing the Efficiency of Grey-Water Reuse at Household Level and Its Suitability for Sustainable Rural and Human Development
Hill lakes : innovative approach for sustainable rural management in the semi-arid areas in Tunisia
The role of limited irrigation and advanced management on improving water productivity of rainfed wheat at semi-cold region of upper Karkheh River Basin, Iran
A Participatory GIS Approach for Assessing Land Suitability for Rainwater Harvesting in an Arid Rangeland Environment
Water and land productivities of wheat and food legumes with deficit supplemental irrigation in a Mediterranean environment
Spatial and Temporal Analyses of Water Quality in the Dhrabi Watershed of Pakistan: Issues and Options
The Fallacy of Irrigation Modernization
Book Chapter
February 19, 2012

Many countries are keen to move away from traditional surface irrigation systems to more modern and efficient systems such as drip and sprinkler irrigation. Surface irrigation systems are less efficient in terms of water application because more...

The use of the microcatchment water harvesting for fodder shrub production
Selection and Characterization Of the Badia Benchmark research site
Impact of microcatchment water harvesting on the diversity of the Badia rangelands of Jordan
Rainfed benchmark Site selection and characterization
Book Chapter
December 31, 2011

From these workshops and an analysis of project documentation, we can conclude that possibilities for the improvement of water use do exist. These improvements depend not only on technical aspects, but also on organization and policy considerations.

Economic evaluation and adoption of improved technologies
Book Chapter
December 31, 2011

In this study, an economic evaluation of water-use efficiency technologies proposed and tested by the agronomic team in the Tadla Irrigated Perimeter was carried out. To capture climatic variability, the analysis was conducted during two contrasting...

Towards sustainable and improved water productivity in the old lands of the Nile Delta
Effect of water harvesting techniques on water productivity and soil erosion
Improving water productivity in the Tadla region of Morocco
Book Chapter
December 31, 2011

The main objective of the project is the adoption by farming communities of strategies and tested technologies that optimize the conjunctive use of rainwater and scarce water resources in supplemental irrigation systems for improved and sustainable...

Systems approach to water productivity assessment using cropping system Models
Improved water and land productivities in the saline areas of the Nile Delta
Role of current policies and institutions Egypt in improving irrigated agriculture
Enhancing soil fertility and irrigation management in the new lands
Selection of benchmark research watersheds in Libya
Book Chapter
December 13, 2011

This report describes the use of improved methodologies developed to identify suitable watersheds based on an integrated resources management concept. The approach integrates multi-disciplinary knowledge, GIS utilities, and verification in the field...

Contour Laser Guiding for the Mechanized “Vallerani” Micro-catchment Water Harvesting Systems
Performance and Adaptation of the Vallerani Mechanized Water Harvesting System in Degraded Badia Rangelands
Evapotranspiration and water use of full and deficit irrigated cotton in the Mediterranean environment in northern Syria
The potential of small-scale rainfed agriculture to strengthen food security in Arab countries
Mechanization of transplanting shrubs seedlings and contours laser guiding for Vallerani system
Microcatchment water harvesting systems for fruit trees and shrubs
Management practices for improving water productivity in the Dasht-e-Azadegan
Present status of salt-affected and waterlogged soils in Dasht-e-Azadegan and management strategies for their sustainable utilization
Micro-catchment water harvesting potential of an arid environment
Performance of Penman-Monteith FAO56 in Semiarid Highland Environment
Water Productivity of Irrigated Wheat and Maize in the Karkheh River Basin of Iran
Managing water in rainfed agriculture - The need for a paradigm shift
Improving agricultural water productivity: Between optimism and caution
Durum Wheat and barley productivity in saline-drought environments
Yield and water-production functions of two durum wheat cultivars grown under different irrigation and nitrogen regimes
Optimizing supplemental irrigation: Tradeoffs between profitability and sustainability
Yield Gap Analysis: Modelling of Achievable Yields at Farm Level
Crop coefficient for drip-irrigated cotton in a Mediterranean environment
In-season wheat root growth and soil water extraction in the Mediterranean environment of northern Syria
Modification of the FAO-56 spreadsheet program for scheduling supplemental irrigation of winter crops in a Mediterranean climate
Modification of the FAO‐56 spreadsheet program for scheduling supplemental irrigation of winter crops in a Mediterranean climate
Assessment of winter wheat production under early sowing with supplemental irrigation in a cold highland environment using CropSyst simulation model
Tempo-spatial covariance structure of lentil yield and water use efficiency from supplemental irrigation trials
Classification and salt tolerance analysis of barley varieties
Effect of supplemental irrigation on leaf stomatal conductance of field-grown wheat in northern Syria
Wheat water productivity and yield in a cool highland environment: Effect of early sowing with supplemental irrigation
The validity of predawn leaf water potential as an irrigation-timing indicator for field-grown wheat in northern Syria
Water harvesting and supplemental irrigation for improved water productivity of dry farming systems in West Asia and North Africa
Salinity effect on grain quality of two durum wheat varieties differing in salt tolerance
Faba bean productivity under rainfed and supplemental irrigation in northern Syria
Salt tolerance analysis of chickpea, faba bean and durum wheat varieties II. Durum wheat
Salt tolerance analysis of chickpea, faba bean and durum wheat varieties I. Chickpea and faba bean
Improving Water Productivity in the Dry Areas of West Asia and North Africa
Management alternatives for improved durum wheat production under supplemental irrigation in Syria
Water-use efficiency and transpiration efficiency of wheat under rain-fed conditions and supplemental irrigation in a Mediterranean-type environment