ISHS Acta Horticulturae 792: V International Symposium on Irrigation of Horticultural Crops
IRRIGATION SCHEDULING OF YOUNG OLIVE TREES 'MORISCA' USING PLANT BASED MEASUREMENTS |
| Authors: | A. Martín-Vertedor, M.H. Prieto, J.M. Pére, A. Moriana |
| Keywords: | maximum daily shrinkage, stem water potential, trunk diameter variation, trunk growth rate |
| Abstract:
Irrigation scheduling of young olive trees cv. 'Morisca' using trunk diameter variation (TDV), stem water potential (SWP) and estimates of crop evapotranspiration (ETc) based on the FAO approach (Allen et al., 1998) were compared. Two SWP treatments (SWP-1.2 and SWP-2.0) with thresholds of -1.2 and -2.0 MPa to trigger irrigation were imposed. The TDV treatment was divided into three phases for irrigation management. Trunk growth rate (TGR) was used to trigger irrigation in all phases, while maximum daily shrinkage (MDS) was only used in the second phase of the season. The beginning of the irrigation period in the FAO treatment was based on a soil water deficit of 90 mm/m depth of soil and then scheduled twice per week. The irrigation period was delayed in the plant based treatments in comparison with the FAO treatment (10, 3 and 21 days with SWP-1.2, TDV and SWP-2.0 respectively). The amount of water applied was 112%, 145% and 43% of the FAO treatment in SWP-1.2, TDV and SWP-2.0 treatments, respectively. Water relations measurements were clearly affected in SWP-2.0. Midday stem water potential showed significant differences between SWP-2.0 and the rest of the treatments early in the season. | |
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