FEATURE Food & Beverage


Ways to increase food


production in the UK


Technology for covered crops and in the field has potential to increase UK production, say experts Y


ield, taste and time to harvest can all be impacted by light. Photosynthesis – the process by which plants convert


sunlight to biomass – is a bottleneck in agricultural productivity and thus limits food production. Increasing the rate of photosynthesis in fi eld crops and enabling year around production of green vegetables are among the goals discussed at the Agri-TechE event “Let there be Light” hosted in February by the University of Essex Plant Innovation Centre.


“Light is a limiting factor in UK agriculture, but new approaches off er to improve the way plants respond to that light, opening capacity for new crops and year-round production, as the country looks to build more resilient supply chains to increase food security,” said Dr Belinda Clarke, Agri-TechE Director. A blended approach of fi eld and


undercover cropping may increase the UK’s potential to be self-suffi cient in leafy greens, added University of Essex researcher John Stamford, who is looking at how to use tailored LED lighting recipes to improve crop performance and yield: “Speaking to farmers, there are a few issues around the supply of leafy greens in the supermarkets. Around November production switches from the UK to Spain, which means


26 May 2022 | Automation


we are importing these crops over the winter months. The idea is to improve accessibility of hydroponics to potentially have cost-eff ective year-round UK production. Light plays an important role here.”


Stamford has experimented with


artifi cial day lengths and changing the quality of light that a plant receives over time to gauge the impact they have on its fl avour and other properties: “A plant responds to light quality and quantity in order to optimise itself for the environment, and we can use this response to customise the fl avour and morphology of the plant.” Lighting can also be used to reduce time to harvest, according to research by Jim Stevens of Vertical Future, an engineering fi rm that designs controlled environments for clients. Vertical Future recently announced a £21m fundraising round, which will be used to boost its development pipeline and widen the options of what can be grown. “Growing lettuces at supermarket prices in vertical farms may be feasible if we can get their growth cycle down from eight weeks to fi ve or six. The problem is, lettuces suff er from tip burn, especially if they grow too fast. These ugly brown spots on the leaves are caused mainly by slow transpiration of water through the plants and are unsurprisingly rejected by


consumers,” said Stevens. “One option is to change the light spectrum to increase transpiration at higher light levels – for example turning up the blue spectrum to trigger the plant’s stomata to open and cool the plant.” Field crops could also benefi t from technology, to accelerate the rate of photosynthesis. Agri-tech start-up Glaia is achieving this by using a naturally occurring carbon-nano material to create ‘sugar dots’ that can be sprayed on to foliage. Once located on the leaves, the dots increase the number of light- harvesting antenna, improving the response to light. When applied to wheat, strawberries and tomatoes, they have been shown to increase yields 20-40%. The event “Let there be light” took place on 22nd February at the Essex Plant Innovation Centre at the University of Essex. Speakers at the event included Molly Allington, CEO of Albotherm, whose heat-sensitive shade coating optimises the amount of light entering the glasshouse or polytunnel; John Matcham, Technical Director of Light Science Technologies, a developerw of novel lighting recipes for a variety of environments; and James Millichap- Merrick, CEO of Vitabeam, whose ‘Quantum Energy’ lighting has been shown to boost yield and extend shelf-life of fresh produce.


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