Better fertigation with ion-specific measurements

Added on 26 July 2022

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Better fertigation with ion-specific measurements

Growers who want to have their supply and drainage water tested have to collect a sample and send it to a laboratory. They then have to wait a few days for the result. For these reasons this operation is done only every 7 - 14 days. By measuring the water with an ion-specific meter in-situ, the result is known in about an hour, and the grower can therefore make immediate adjustments if necessary. In addition the creation of data in-situ leaves space for future automation of the adjustments. The Business Unit Greenhouse Horticulture and Flower Bulbs of Wageningen University & Research is investigating the practical use of Celine, an ion-specific measuring equipment, and the benefit of a so-called 'ion-specific cultivation'.

A few years ago, The Sensor Factory launched the Celine, a tool for conducting ion-specific measurements which use the technique of capillary electrophoresis. WUR has created a consortium to investigate how the Celine can best be used and improved. WUR aims to collect enough information to compare ion-specific cultivation (ISC) (daily adjustment per ion) versus conventional practice (CC) (daily adjustment on EC) and to prove the higher efficiency of the former. ISC is believe to reduce ion fluctuations in the root environment when compared to CC, which can ultimately increase the yield by 5%.

Laboratory tests

Laboratory tests were first conducted to prove the effect of ion fluctuations on yield. WUR has then run a comparing trial between ISC and CC, which however did not show any significant gain for ISC due to technical failures in applying the daily adaptations to ISC. In fact, to apply daily adjustment it is necessary to hold a fertiliser injection unit. For this reason, the investigation followed in 2021 at the vegetable growing company Royal Pride, and the Celine is currently being tested by the tomato grower Kwekerij Lijntje, where both growers own fertiliser injection units.