id
	15653
Url
	https://chloe.cnr.it/s/BiDiAr/item/15653
Resource template
	Academic Article
Resource class
	bibo:AcademicArticle
Title
	Estimating Potential Evapotranspiration
Creator
	Hargreaves, George H.
	Samani, Zohrab A.
Date
	1982
Language
	eng
Rights
	© 1982 American Society of Civil Engineers
Abstract
	Increasing population and needs for an augmented food supply give greater importance to improved procedures for estimating agricultural water requirements both for irrigation and for rain-fed agriculture. Four methods for estimating potential evapotranspiration are compared and evaluated. These are the Class A evaporation pan located in an irrigated pasture area, the Hargreaves equation, the Jensen-Haise eguation, and the Blaney-Criddle method. The evaporation pan is rated as superior to the other methods. However, the difference in reliability between the pan and the Hargreaves method are not considered to be very significant. Both the Jensen-Haise and the Hargreaves methods require either measured or estimated solar radiation. Methods are presented for estimating solar radiation from the difference between maximum and minimum temperature, from the percentage of possible sunshine, and from relative humidity. These procedures have some limitations, but provide improved reliability and make the estimates more universal.
Is Part Of
	Journal of the Irrigation and Drainage Division
Doi
	https://doi.org/10.1061/JRCEA4.0001390
Issue
	3
Pages
	223-230
Uri
	https://ascelibrary.org/doi/10.1061/JRCEA4.0001390
Volume
	108
Homepage
	https://www.zotero.org/groups/5293298/bidiar/items/HSRJ3HDC/item-list

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