UK berry grower conducts 500 root zone measurements per day:

"Frequent substrate measurement can eliminate water wastage and reduces fertiliser costs"

Clock House Farm is based in the rolling hills of Kent, a few miles south of Maidstone in the UK. Its expansive farm is devoted to the cultivation of berries. “We produce about 1,000 tonnes of strawberries and 1,000 tonnes of raspberries a year, all grown in polytunnels on 223 hectares in multiple locations,” says farm manager Nick Deppe.

The company was one of the first commercial growers to adopt table-top production of strawberries in the late 1990’s. Since 2008, they have been using Delta-T WET Sensors to monitor growing conditions, making thousands of readings a week.

Nick Deppe of Clockhouse Farm
. The coir on their farm is from Botanicoir

Nick oversees the WET Sensor usage and explains how and why the device is used: “The WET Sensor shows us what the EC of the coir is, and obviously also the moisture content and the temperature. The system allows you to know what’s going on in real time quickly and easily.”

Nick oversees a team of 7 site managers, each taking at least 60 separate readings a day, resulting in around 500 daily measurements. “They control the irrigation on each site, communicating with each other and striving to keep the optimum levels of moisture. With multiple sites, you need a tool of some description, so you can set goals and get them to hit those targets.”

The WET Sensor

This approach allows Clock House Farm to address any shortcomings at very short notice, “which is absolutely critical with fruit such as raspberries, which can deteriorate within a matter of hours under sub-optimum growing conditions.”

In terms of quality and yield optimisation, Nick believes that the only way in which monitoring could be further improved would be with the use of instruments to measure the coir’s PH. In any case, “the EC is an interesting figure because, unlike moisture, you can’t see it.”

One of the tunnels at Clock House Farm

The immediacy of the data which the WET Sensor provides is what the company most appreciates, not just the excellent accuracy. “In terms of benefits that the WET Sensor provides, it not only gives us the confidence that we have optimal growing conditions at all times, it has also enables us to reduce irrigation levels, eliminating unnecessary water wastage and reducing expensive fertiliser costs.”

For more information:
Delta-T Devices

Dominic Cahalin, Marcoms Coordinator
130 Low Rd

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