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Comparison of actual and crop evapotranspiration from grape vines

Spano, Donatella Emma Ignazia and Duce, Pierpaolo and Deidda, Pietro and Motroni, Andrea (2000) Comparison of actual and crop evapotranspiration from grape vines. In: 3. International Symposium on Irrigation of Horticultural Crops, 28 June-2 July, 1999, Lisbon, Portugal. Leuven, International Society for Horticultural Science. p. 174-184. (Acta Horticulturae, 537). ISBN 978-90-66059-13-9. Conference or Workshop Item.

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Abstract

Maximum crop evapotranspiration (ETc) represents the evapotranspiration rate for a crop with little or no reduction in transpiration due to a water limitation. However, ETc is dependent on the irrigation method and management because of the influence on soil evaporation. When the soil surface evaporation is minimal, differences between actual evapotranspiration (ETa) and crop evapotranspiration (ETc) result from plant control of transpiration, which depends mainly on environmental conditions. Therefore, the ratio of ETa to ETc may provide a good measure of water stress when there is minimal soil evaporation. To investigate this idea, experiments were conducted over grapevines near Villasor, Italy. ETc was calculated as the product of ETo calculated using the Penman-Monteith equation and crop coefficient (Kc) values from FAO Irrigation and Drainage Paper 56. Big changes in the ratio ETa/ETc occurred following an irrigation, but the ratio tended to stabilize once the soil surface had dried. Typically, ETa and ETc rates were similar until just before noon when the ETa dropped below the ETc rate for the remainder of the day. The hourly and daily differences between ETa and ETc were attributed to both soil evaporation and physiological responses of the plants to water deficit

Item Type:Conference or Workshop Item (Paper)
ID Code:311
Status:Published
Uncontrolled Keywords:Sparse canopies, vineyard, energy balance, water deficit, irrigation scheduling
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
002 Altri enti e centri di ricerca del Nord Sardegna > SAR-Servizio Agrometereologico Regionale per la Sardegna, Sassari
Publisher:International Society for Horticultural Science
ISBN:978-90-66059-13-9
Deposited On:18 Aug 2009 10:02

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