| Determination of the empirical coefficient of Hargreaves formula in computing crop evapo-transpiration |
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| DOI：10.7606/j.issn.1000-7601.2004.04.07 |
| Key Words: reference evapo-transpiration Penman-Monteith Formula emppirical coefficient Hargreaves formula |
| Author Name | Affiliation | | ZHAO Yong | College of Hydraulics and Construction Engineering,Northwest A＆F university,Yangling,Shaanxi 712100,China | | CAI Huan-jie | College of Hydraulics and Construction Engineering,Northwest A＆F university,Yangling,Shaanxi 712100,China | | WANG Jian | College of Hydraulics and Construction Engineering,Northwest A＆F university,Yangling,Shaanxi 712100,China | | ZHANG Zhenhua | Geography department,Yantainormal College,Yantai,Shandong,264000,China |
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| Abstract: |
| The paper introduces the ratio to mutually transform between the reference evapo-transpirations by FAO-recommended Hargreaves formual and by Penman-Monteith Formula, then uses Hargreaves formula and Penman-Monteith Formula to calculate the crop evapo-transpirations during various growth periods with the 19-year meteorological data measured by the Experiment Station of Irrigation of the Northwest A&F University, and late on determines the empirical coefficient of Hargreaves formula through analysis. The experiences prove that the result is reliable and feasible for production practices. |
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