WHOLE-TREE WATER RELATIONS AND IRRIGATION SCHEDULING FOR MANGO

Ping Lu
Water status in trees is commonly studied by measuring leaf water potential with a pressure bomb, but due to mango’s excessive latex exudation, leaf water potential measurements cannot be reliably measured this way. We have measured xylem sap flow in the tree trunk, microvariation of branch diameter (microdendro-metry), and leaf gas exchange to study mango water relations. The main Australian mango cultivar ‘Kensington Pride’ is very sensitive to air dryness, more so than most Florida cultivars. Both sap flow (tree water use) and twig/branch shrinkage have been shown to be good plant-based indicators of plant water status and been successfully used to control irrigation. However, at the present time, both techniques are far from being practical or economical enough to be used by growers for their irrigation scheduling. A low cost, farmer friendly tool for irrigators, ‘FullStop’ wetting front detectors, was developed by CSIRO in Australia. ‘FullStop’ is a simple device buried in the ground in the rooting zone, which will tell the irrigators when to switch off irrigation. This system has great potential as an aid to irrigation decision making.
Ping Lu, (2013). WHOLE-TREE WATER RELATIONS AND IRRIGATION SCHEDULING FOR MANGO . Acta Hortic. 992, 115-122
DOI: 10.17660/ActaHortic.2013.992.13
https://doi.org/10.17660/ActaHortic.2013.992.13
sap flow, microdendrometry, plant-based water status indicator, 'FullStop'
English

Acta Horticulturae