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Model for estimating evaporation and transpiration from row crops

Ventura, Francesca and Faber, Ben A. and Bali, Khaled M. and Snyder, Richard L. and Spano, Donatella Emma Ignazia and Duce, Pierpaolo and Schulbach, Kurt F. (2001) Model for estimating evaporation and transpiration from row crops. Journal of Irrigation and Drainage Engineering, Vol. 127 (6), p. 339-345. eISSN 1943-4774. Article.

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DOI: 10.1061/(ASCE)0733-9437(2001)127:6(339)


Accurate estimates of crop evapotranspiration ETc, that quantify the total water used by a crop, are needed to optimize irrigation scheduling for horticultural crops and to minimize water degradation. During early growth, accurate assessments of ETc are difficult in vegetable crops because of high soil evaporation due to frequent irrigation. A model to estimate ETc for vegetable crops, using only daily reference evapotranspiration data as an input parameter, was developed. It calculates crop transpiration and soil evaporation based on ground cover and daily radiation intercepted by the canopy. The model uses a two-stage soil evaporation method adapted to conditions of variable reference evapotranspiration. The model was evaluated against data using measurements from two seasons of lettuce crop, two tomato fields in the same season, and one season of broccoli crop production. Using all of the crop data, the root–mean–square error for measured versus modeled daily ETc was 0.72 mm day-1, indicating that the model works well.

Item Type:Article
ID Code:5297
Uncontrolled Keywords:Crop evaporation and transpiration, ETc
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/03 Arboricoltura generale e coltivazioni arboree
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > CNR-Consiglio Nazionale delle Ricerche > Istituto di biometeorologia, Sassari
001 Università di Sassari > 01 Dipartimenti > Economia e sistemi arborei
Deposited On:10 Jan 2011 15:53

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