ISHS Acta Horticulturae 792: V International Symposium on Irrigation of Horticultural Crops
EVAPOTRANSPIRATION OF GRAPEVINES MEASURED BY A WEIGHING LYSIMETER IN LA MANCHA, SPAIN |
| Authors: | A. Montoro, R. López Urrea, F. Mañas, P. López Fuster, E. Fereres |
| Keywords: | crop coefficient |
| Abstract:
In 1999, a weighing lysimeter planted with two grapevines (cv. Cencibel) was installed in the center of 1 ha plot in the experimental farm "Las Tiesas" near Albacete, La Mancha, Spain. The lysimeter was filled with soil in a single monolith, 3 x 3 m and 1.7 m deep; an undisturbed profile that included a calcareous layer in the subsoil. The total lysimeter mass exceeded 18.5 t and the load cell of the weighing system had a resolution of 0.25 kg, equivalent to 0.04 mm. One second readings were registered in a datalogger that provided weight loss every 15 min. Plant spacing was 3 x 1.5 m and the whole plot was irrigated by a drip system with one line per row and emitters every meter within the line. Records of grapevine evapotranspiration (ETc) were collected from 2002 to 2005 and detailed canopy development information was obtained for the 2004 and 2005 growing seasons. A nearby grass lysimeter and an automatic weather station provided reference crop evapotranspiration (ETo) to determine the grapevine crop coefficients in the lysimeter as a function of plant age and developmental stage. Results of ETc and crop coefficients as affected by age and various plant and climatic factors are presented. | |
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