AVOCADO. Application of the Phytomonitoring techniques for adjustment and validation of irrigation scheduling Phytech LTD. 2005. Phytomonitoring is the Information and Decision Support System based on direct measurement of plant conditions. Recommended setup for Avocado. Stationary
of the Phytomonitoring techniques for adjustment and validation of irrigation scheduling
Phytomonitoring is the Information and Decision Support System based on direct measurement of plant conditions
1 x RS-ATH-5R
and Humidity Sensor
(-10 to 50 °C ; 0 to 100 %RH)
2 x RS-DE-1R Dendrometer
(0 to 10 mm stroke)
2 x RSD-SMS-2R Soil Moisture Sensor
(0 to 50 vol. %)
RS-TM-2R Twin Tensiometer
(0 to 84 cbar)
Irrigation scheduling based on the trunk daily contraction
Trunk diameter diurnal curve reflects the appropriate variations of plant water content. Normally, trunk contracts at daytime due to water loss by transpiration and swells at night while replenishing water reserves.
Amplitude of such variations is proportional to water deficit. Thus, the daily contraction amplitude (DCA) may be used as a criterion for scheduling irrigation.
In the practical example, shown in the figure, the grower irrigated his plants when DCA exceeds ~200µm.
Other resources of continuous monitoring
Continuous recording allows disclosing the intimate effects of plant water state and growth that may be interesting for keen growers.
The response of the blossomed avocado tree to irrigation, applied at severe khamsin, is shown in details in the right chart. Correct irrigation allowed to keep the pants safe and to recover their water state after khamsin.