Controlling the Nutrition Water Level in the Non-Circulating Hydroponics based on the Top Projected Canopy Area

Hurriyatul Fitriyah(1*), Agung Setia Budi(2), Rizal Maulana(3), Eko Setiawan(4)

(1) Teknik Informatika, FILKOM, Universitas Brawijaya, Malang
(2) Teknik Informatika, FILKOM, Universitas Brawijaya, Malang
(3) Teknik Informatika, FILKOM, Universitas Brawijaya, Malang
(4) Teknik Informatika, FILKOM, Universitas Brawijaya, Malang
(*) Corresponding Author


Deep Water Culture Hydroponics is suitable for a large-scale plantation as it does not require turn-on the electric pump constantly. Nevertheless, this method needs an electric aerator to give Oxygen to the roots. Kratky’s and Dry Hydroponics are the two methods that suggest an air gap between the raft and the nutrient water level. The gap gives Oxygen to the roots without an aeration pump. Controlling the nutrient water level is required to give a good distance of air gap for Precision Agriculture. The root length estimation used to be done manually by opening the raft, but this research promotes automatic and non-contact estimation using the camera. The images are used to predict the root length based on the Top Projected Canopy Area (TPCA) using various Regression Methods. The test shows that the TPCA gives a high correlation toward the Root Length (>0.9). To control the nutrient water level, this research compares If-Else and the Linear Regression. The error between the actual level that is measured using an Ultrasonic sensor and the setpoint is fed to an Arduino Uno to control the duration of an inlet pump and the outlet pump. The If-Else and the Linear Regression method show good results.


TPCA; Root length; Control; Water Level; Regression

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