alexa Variability of the Ratio of Alfalfa to Grass Reference Evapotranspiration under Semiarid Climate | OMICS International| Abstract
ISSN: 2168-9768

Irrigation & Drainage Systems Engineering
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  • Short Communication   
  • Irrigat Drainage Sys Eng 2018, Vol 7(1): 204
  • DOI: 10.4172/2168-9768.1000204

Variability of the Ratio of Alfalfa to Grass Reference Evapotranspiration under Semiarid Climate

Djaman K1*, Lombard K1, Koudahe K2, Allen S1 and O'Neill M1
1Department of Plant and Environmental Sciences, Agricultural Science Center, New Mexico State University, Farmington, USA
2ADA Consulting Africa, , Lomé, Togo
*Corresponding Author : Djaman K, Department of Plant and Environmental Sciences, Agricultural Science Center, New Mexico State University, Farmington, USA, Tel: +1505 960 7757, Email: [email protected]

Received Date: Feb 08, 2018 / Accepted Date: Feb 20, 2018 / Published Date: Feb 28, 2018

Abstract

Crop evapotranspiration estimation is critical for sustainable water management under the semiarid and arid climate in New Mexico. While irrigation scheduling is based on daily evapotranspiration through the two step approach, reference evapotranspiration and crop coefficients should be determined with accuracy. The utilization of grass reference evapotranspiration (ETo) or alfalfa reference evapotranspiration (ETr) and the conversion from one to the other calls for an understanding of the relationship between ETr and ETo. The objectives of this study were to develop the ratio of ETr to ETo values (Kr) and to determine the variability of Kr during the year for six locations across the State of New Mexico (USA). The results showed long term annual Kr values to vary from 1.28 to 1.45 and the coefficient of determination varied from 0.96 to 0.98. Kr value decreases from January to July and increases from August to December and was at its lowest Kr value at the peak daily reference evapotranspiration. Annual average Kr values were 1.31, 1.38, 1.43, 1.38, 1.38 and 1.48 at Alcalde, Fabian Garcia, Farmington, Leyendecker, Las Cruces and Tucumcari locations and the growing season average Kr values were 1.24, 1.32, 1.38, 1.31, 1.32 and 1.42 at the respective locations. The strong correlation between ETr and ETo allows the conversion of the grass reference evapotranspiration to alfalfa reference evapotranspiration and vice versa however, caution should be taken when using the crop coefficient values to convert either ETo or ETr to actual crop evapotranspiration for irrigation scheduling and water management.

Keywords: Reference evapotranspiration; Grass; Alfalfa; Ratio; New Mexico

Citation: Djaman K, Lombard K, Koudahe K, Allen S, O’Neill M (2018) Variability of the Ratio of Alfalfa to Grass Reference Evapotranspiration under Semiarid Climate. Irrigat Drainage Sys Eng 7: 204. Doi: 10.4172/2168-9768.1000204

Copyright: ©2018 Djaman K, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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