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Current Research in Agricultural Sciences

June 2020, Volume 7, 1, pp 15-22

Estimating Reference Evapotranspiration by Hargreaves and Blaney-Criddle Methods in Humid Subtropical Conditions

Muhammad Hafeez

Zia Ahmad Chatha

Alamgir Akhtar Khan

Allah Bakhsh

Abdul Basit

Fatima Tahira

Muhammad Hafeez¹

Zia Ahmad Chatha²
Alamgir Akhtar Khan³

Allah Bakhsh⁴ Abdul Basit⁴ Fatima Tahira⁶

Department of Agricultural Engineering, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan, Pakistan. ¹

Department of Food Engineering, Faculty of Agricultural Engineering, UAF, Faisalabad, Pakistan. ²

Department of Agricultural Engineering, MNSUA, Multan, Pakistan. ³

Department of Botany, Ghazi University, Dera Ghazi Khan, Pakistan. ⁴

Department of Mathematics, Institute of Southern Punjab, Multan, Pakistan. ⁶

on Google Scholar

on PubMed

Pages: 15-22

DOI: 10.18488/journal.68.2020.71.15.22

Article History:

Received: 21 January, 2020
Revised: 25 February, 2020
Accepted: 30 March, 2020
Published: 27 April, 2020

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Abstract:

Various methods are available to predict reference evapotranspiration (ETo) but the Penman-Monteith (PM) ETo method has been considered to be the most accurate ETo method to determine ETo. The PM ETo method can be solved by various weather parameters like atmospheric temperature, wind velocity, moisture content and net solar radiations. There are many weather stations in the world that have no complete set of weather parameters to predict ETo by applying PM ETo method. So alternative ETo methods like Hargreaves (HG) and Blaney-Criddle (BC) ETo methods are used which need only a fewer number of weather parameters. In this paper, two ETo methods, HG and BC are compared with PM ETo method in humid subtropical climatic conditions of Islamabad and Kakul (Abbottabad) weather stations. The study indicate that HG ETo method overestimated PM ETo method by 23.78% at Islamabad weather station and 28.47% at Kakul station. The BC ETo method overestimated PM ETo method by 37.93% at Islamabad weather station and by 22.68% at Kakul weather station. The dissimilarity of HG ETo method with PM ETo method with RMSE was 1.09 mm/day at Islamabad weather station and 1.17 mm/day at Kakul weather station. The dissimilarity of BC ETo method with PM ETo method has Root Mean Square Error (RMSE) of 2.86 mm/day at Islamabad weather station and 1.48 mm/day at Kakul weather station.

Contribution/ Originality
The objective of this investigation is to compare ETo by HG and BC ETo methods with PM ETo method in humid subtropical climatic conditions of Pakistan.

Keywords:

Blaney-Criddle, Hargreaves, Humid subtropical, ETo, Islamabad, Kakul, Pakistan.

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