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Maximum daily trunk shrinkage and stem water potential reference equations for irrigation scheduling of lemon trees



Maximum daily trunk shrinkage and stem water potential reference equations for irrigation scheduling of lemon trees



Irrigation Science 27(2): 121-127



Measurements of midday stem water potential (stem) and maximum daily trunk shrinkage (MDS) were done over a 3-year period in adult Fino lemon trees (Citruslimon (L.) Burm. fil.) grafted on sour orange (C. aurantium L.) rootstocks. Plants were irrigated daily above their water requirements in order to obtain non-limiting soil water conditions. The results indicated that reference equations can be obtained for MDS and stem by pooling data across several seasons using crop reference evapotranspiration (ETo), daily mean vapor pressure deficit (VPDm) and mean daily air temperature (Tm) in the case of MDS, and ETo in the case of stem. The best predictor of MDS under non-limiting soil water conditions was Tm, suggesting that MDS reference values can be obtained by means of easy and cheap measurements. MDS and stem values were not influenced significantly by yield or crop load variations between years. A negative linear relationship between MDS and stem was found, pointing to an unchanging radial hydraulic conductivity in the bark tissues and suggesting that the MDS is controlled by water potential.

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Accession: 023011373

Download citation: RISBibTeXText

DOI: 10.1007/s00271-008-0126-z



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