Evaluation of different ET0 calculation methods: a case study in Kano State, Nigeria

Issue Date

12-2012

Abstract

Evapotranspiration (ET) is a descriptive term for the sum of evaporation and plant transpiration from the earth's land surface to the atmosphere. Potential evapotranspiration (ET0) is important in irrigation system design, irrigation scheduling and for studies in drainage and hydrology. This study sought to compare different ET estimation methods to measure E(pan). Reference evapotranspiration was estimated from meteorological data that were collected from the Institute of Agricultural Research (IAR) in Kano State, Nigeria. The evaluations were carried out using ETo from Pan Evaporation and from empirical formulae, namely, (1) Modified Penman, (2) Thornthwaite, (3) Blaney-Criddle and (4) Penman-Monteith methods. A software-based ETo calculator was used to implement the Penman Monteith equation. The results were tabulated, and comparisons were made between the methods and between the years using analysis of variance (ANOVA) and regression analysis. From the ANOVA, there was a significant difference between the methods of evaluation. The correlation coefficient (r) between Modified Penman and Pan Evaporation gave better estimation with high correlation.

Source or Periodical Title

Philippine Agricultural Scientist, The (Formerly: The Philippine Agriculturist)

ISSN

0031-7454

Volume

95

Issue

4

Page

394-399

Document Type

Article

Frequency

quarterly

Physical Description

illustrations ; graphs ; tables ; references

Language

English

Subject

analysis of variance, Blaney-Criddle method, correlation coefficient, evapotranspiration, Modified Penman method, pan evaporation, Penman-Monteith method, Thornthwaite method

En – AGROVOC descriptors

EVAPOTRANSPIRATION; TRANSPIRATION RATIO; IRRIGATION SYSTEMS; WEATHER DATA; ANALYSIS OF VARIANCE

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