Calculation of crop evapotranspiration in greenhouse

Chinese Journal of Applied Ecology

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Calculation of crop evapotranspiration in greenhouse

CHEN Xin-ming^1,2; CAI Huan-jie¹; LI Hong-xing¹; WANG Jian¹; DU Wen-juan²

¹College of Water Resources and Architecture Engineering, Northwest A&F University, Yangling
712100, Shannxi, China;
²College of Agricultural Engineering, Tarim University, Alar 843300, Xinjiang, China

Received:2006-01-16 Revised:2006-11-07 Online:2007-02-10 Published:2007-02-10

Abstract

Abstract: Based on Penman-Monteith equation, a simplified formula for calculating the crop evapo-transpiration in greenhouse was deduced by introducing the parameter of crop canopy height and modifying the item of aerodynamics related to wind velocity. The deductive procedure was analyzed theoretically, and the formula was validated with meteorological data. The results showed that the modified Penman-Monteith equation had a higher precision of prediction, with a relative deviation of 4.7%—17.1% and 11.1% on average, being suitable to calculate the crop evapotranspiration in greenhouse.

Key words: Urban vegetation, Ecological benefits, Remote sensing, GIS, Urban Ecosystem Analysis (UEA)

CHEN Xin-ming^1,2; CAI Huan-jie¹; LI Hong-xing¹; WANG Jian¹; DU Wen-juan² . Calculation of crop evapotranspiration in greenhouse[J]. Chinese Journal of Applied Ecology.

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Calculation of crop evapotranspiration in greenhouse

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