Irrigation & Drainage Systems Engineering

O'Neill M

Publications

• Short Communication
  Variability of the Ratio of Alfalfa to Grass Reference Evapotranspiration under Semiarid Climate
  Author(s): Djaman K, Lombard K, Koudahe K, Allen S and O'Neill MDjaman K, Lombard K, Koudahe K, Allen S and O'Neill M
  
  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 a.. Read More»
  DOI: 10.4172/2168-9768.1000204

  Abstract PDF