Efficient water management of crops requires accurate irrigation scheduling which, in turn, requires the accurate measurement of crop water requirement. Irrigation is applied to replenish depleted moisture for optimum plant growth. Reference evapotranspiration plays an important role for the determination of water requirements for crops and irrigation scheduling. Various models/approaches varying from empirical to physically base distributed are available for the estimation of reference evapotranspiration. Mathematical models are useful tools to estimate the evapotranspiration and water requirement of crops, which is essential information required to design or choose best water management practices. In this paper the most commonly used models/approaches, which are suitable for the estimation of daily water requirement for agricultural crops grown in different agro-climatic regions, are reviewed. Further, an effort has been made to compare the accuracy of various widely used methods under different climatic conditions.

R. Kumar

M. K. Jat

V. Shankar

Water Science & Technology

WATER SCIENCE AND TECHNOLOGY 发表关于水和废水科学技术各个方面的同行评议论文。论文通过严格的同行评审程序选择，旨在快速和广泛地传播研究成果、新技术的开发和应用以及相关的管理和政策问题。科学家、工程师、顾问、管理人员和政策制定者会发现这本期刊作为研究活动及其实际应用进展的永久记录是必不可少的。

The journal "Water Science and Technology" publishes peer-reviewed papers on all aspects of water and wastewater science and technology. Papers are selected through a rigorous peer review process, aimed at the rapid and broad dissemination of research findings, the development and application of new technologies, and related management and policy issues. Scientists, engineers, consultants, managers, and policymakers will find this journal an essential record of the progress of research activities and their practical applications.

《Water Science and Technology》期刊发表关于水和废水科学技术各个方面的同行评审论文。所有论文经过严格的同行评审程序，旨在快速而广泛地传播研究成果、新技术的开发与应用，以及相关的管理和政策问题。科学家、工程师、顾问、管理人员和政策制定者将发现，这本期刊是研究活动及其实际应用进展的重要记录。

Water Science and Technology

Methods to estimate irrigated reference crop evapotranspiration – a review

The most commonly used models/approaches, which are suitable for the estimation of daily water requirement for agricultural crops grown in different agro-climatic regions, are reviewed and an effort has been made to compare the accuracy of various widely used methods under different climatic conditions.

Category	Quartile
环境科学与生态学	4
环境科学与生态学, 工程环境	4
环境科学与生态学, 环境科学	4
环境科学与生态学, 水资源	4

Methods to estimate irrigated reference crop evapotranspiration – a review

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