Estimation of Reference Melon Crop-Evapo-transpiration using Eto[Pan-Fao/Penman] and Cropwat Models
Journal Title: Analele Universitatii "Eftimie Murgu" Resita. Fascicula de Inginerie - Year 2015, Vol 22, Issue 1
Abstract
Aiming at contributing to an adequate management of water resources, accurate estimation of reference evapotranspiration (ETo) using evapo-ration pan, FAO-Penman and CROPWAT model is very important for the computation of Egusi-melon crop evapotranspiration (ETc) at different stages of crop growth and development. The study was carried out at Research and Experimental Farm of Auchi Polytechnic, Auchi with area of 6.45 m2. Measured daily evaporation depth and weather parameters for 52-day was used to compute reference evapotranspiration using evaporation pan, derived FAO-Penman and CROPWAT version 8.1 models. The maximum and minimum of EToPan, EToFAO-Penman are 4.1 mm; 5.7 mm and 3.5 mm; 4.2 mm. These values were applied to compute maximum and minimum crop-evapotranspiration (ETc) at ini-tial crop developmental stage as 3.4 mm; 0.68 mm respectively. The maximum and minimum intermediate and maturity values for EToPan, EToFAO-Penman and ETc; 4.0 mm;0.7 mm, 3.9 mm; 0.5 mm ,3.4 mm; 0.68 mm and 0.7 mm; 3.0mm; 0.6 mm; 4.1 mm, 0.46 mm;3.25 mm respectively. The melon crop and evaporation pan coefficient for the three different stages are 0.15; 0.85; 0.60 and the pan coefficient ranged from 0.71 to 1.00 and total rainfall and irrigation depths were computed to 226.9 mm and 46.7mm.
Authors and Affiliations
Olotu Yahaya, Evboifo Nathaniel, M. C. Okafor, C. I. Ayilaran
Keywords
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