Actual and Predicted Evapotranspiration Along with Groundwater Contribution for Wheat Crop

Authors

  • Shahzad Hussain Dahri Department of Irrigation & Drainage, Sindh Agriculture University Tandojam http://orcid.org/0000-0003-2108-9086
  • Munir Ahmed Mangrio Sindh Agriculture University Tandojam, Pakistan
  • Irfan Ahmed Shaikh Sindh Agriculture University Tandojam, Pakistan
  • Zakir Hussain Dahri Pakistan Agricultural Research Council (PARC), Islamabad
  • Ain-ul-Abad Syed Department of fARM Structures, Sindh Agriculture University Tandojam
  • Jazib Hussain Jakhrani Department of Land and Water Management, Sindh Agriculture University Tandojam
  • Taimoor Ali Syed Central South University, China

Keywords:

Water conservation, Irrigation amount, Groundwater, and Crop evapotranspiration

Abstract

This experiment aimed to determine the crop evapotranspiration (ETc), groundwater input in total water used by wheat crop, and to simulate the CROPWAT model to envisage the crop evapotranspiration rate. To estimate on-field ETc and groundwater contribution the combining lysimeter technique was used. The water levels below the soil surface were kept at 1.60, 2.20, and 2.80 m and each water table depth was replicated three times. The experiment was conducted under silt loam (SL) and silty-clay loam (SCL) soil conditions. The climatic parameters and water balance components were recorded accordingly. The on-field ETc was compared with the predicted ETc by CROPWAT model. Under SL soil, the observed ETc was 442, 427, and 401 mm at the water table depth of 1.60, 2.20, and 2.80 m, respectively. The recorded ETc under SCL soil was 419, 402, and 389 mm at the same water table depths, respectively. The ETc reduced with an increase in water level below the surface. The groundwater contribution at 1.60, 2.20 and 2.80 m depth of water level under SL and SCL soil was observed as 50, 41, and 30 % and 43, 34, and 24 %, respectively. The predicted ETc by CROPWAT model for SL and SCL soil conditions was 428.8 and 410.7 mm, respectively. The projected ETc is likely equal to the average ETc observed under lysimeter experiment. Thus, the use of CROPWAT model is recommended to overcome waterlogging and salinity problems and to conserve water resources.

Author Biographies

Shahzad Hussain Dahri, Department of Irrigation & Drainage, Sindh Agriculture University Tandojam

PhD Scholar at Department of Irrigation and Drainage, Faculty of Agricultural Engineering

Munir Ahmed Mangrio, Sindh Agriculture University Tandojam, Pakistan

Professor 

Department of Land and Water Management, 

Irfan Ahmed Shaikh, Sindh Agriculture University Tandojam, Pakistan

Associate Professor,

Department of Irrigation and Drainage

Zakir Hussain Dahri, Pakistan Agricultural Research Council (PARC), Islamabad

Director (Water) / Principal Scientific Officer 

PARC Islamabad

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Published

2021-06-26 — Updated on 2021-07-11

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Section

I-Land and Water Engineering