APS tests stem sensors to monitor tomato crops

Tomato growers in the Isle of Wight and Yorkshire are set to collaborate with researchers to understand better how new sensor technology could help improve yields and reduce crop losses.

In a first for the use of sap-flow and stem diameter sensors in UK tomato production, the research aims to achieve a understanding of the water balance within plants in order to improve greenhouse efficiency.

Growers at APS Produce are installing the sensors in beef, cherry and organic piccolo tomatoes and the data generated will build a continuous picture of water balances within the plants.

The knowledge that growers at APS Produce Ltd hope to gain could significantly reduce tomato losses, improve on-farm efficiency and increase the shelf life of produce. By identifying when water deficit and excess occurs, they can better target irrigation and adjust other greenhouse conditions like ventilation and heating.

Researchers at ADAS have said this should minimise pre-harvest losses caused by fruit splitting and disorders such as blossom end rot, which can otherwise result in losses of up to10% of total tomato yield. If the initial trials prove to be successful, the findings could be applied to many other protected crops including peppers, cucumbers and soft fruit, as well as outdoor annual and perennial crops.

Brian Moralee, Grower Manager at APS Produce said: “Our data platform provider and the sensor company will help us analyse the results, but we’ve already learnt a lot ourselves. “Just a couple of weeks in, we noticed that removing the night screen too quickly was causing leaf tip scorch – our theory is that the shock of cooler air caused the stomata to close and reduced transpiration. So we slowed down the removal of the screen and are seeing less leaf scorch. If it can work commercially and environmentally, we’ll have a fantastic result.”

The field lab brings together six growers at three sites, with additional research support from ADAS staff, and is co-funded by Innovative Farmers and APS Produce. At the end of the growing season, the triallists will compare this year’s tomato losses with historic records, which will give an indication of the overall impact on yields vs losses.

Picture caption: Sap-flow (L) and stem diameter (R) sensors in UK tomato production

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