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Automatic Algorithms for Precision Irrigation of Fuji Apple Trees in the Pacific Northwest

Osroosh, Yasin; R. Troy Peters

We have developed a theoretical model for the estimation of stomatal conductance, theoretical
Osrooshmodels for the estimation of actual and potential transpiration
of apple trees, a theoretical Crop Water Stress Index and
CWSI-based irrigation algorithm, and an analytical model
for estimation of stem water potential. Canopy temperature
measured through infrared thermometry provides a feedback
to these models. To apply automatic irrigation algorithms, we
also developed a central control system including a wireless
sensor network, graphical user interface and required irrigation
control algorithms. A total of seven irrigation scheduling
methods were refined and evaluated.