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United States Department of Agriculture

Agricultural Research Service

Research Project: MANAGING LIMITED IRRIGATION AND RAINFALL FOR CROP PRODUCTION IN SEMI-ARID ENVIRONMENTS

Location: Wind Erosion and Water Conservation Research

Title: Hydrus-3D simulations: Irrigation management strategies for the Texas High Plains

Authors
item Bufon, Vinicius - TEXAS TECH UNIVERSITY
item Lascano, Robert

Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: October 5, 2008
Publication Date: October 9, 2008
Citation: Bufon, V., Lascano, R.J. 2008. Hydrus-3D simulations: Irrigation management strategies for the Texas High Plains[abstract]. American Society of Agronomy, Crop Science Society of America, Soil Science Society of America Joint Annual Meeting. October 5-9, 2008. Houston, Texas. Paper No. 534-12.

Technical Abstract: Half of the cultivated area and more than 80% of crop production in the Texas High Plains (THP) comes from irrigated agriculture, which depends on water from the Ogallala Aquifer. The water table of this aquifer is declining because groundwater withdrawals exceed recharge. This fact compromises its long-term sustainability and tools to manage diminishing water are needed to reduce withdrawals without reductions in irrigated land area and/or crop yields. Increasing weather-based irrigation scheduling using weather networks has been proposed and has the potential to increase water use efficiency. However, evapotranspiration information alone does not solve the challenge of extending the aquifer’s sustainability. The water balance of an irrigated agricultural field is complex and involves many variables, including, crop-type, soil physical properties, and well capacity. Therefore, irrigation-optimization of an agricultural field that considers all variables is difficult and a strategy is to use models in combination with field experiments. For example, Hydrus-3D, a numerical simulation model that calculates soil-water movement and root-water uptake could be used to explore different irrigation scenarios applicable to the THP. Our objective is to use the Hydrus-3D model with sub-surface drip irrigation to explore cotton irrigation strategies under declining water supplies for the THP.

Last Modified: 9/22/2014
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