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Autonomous and robotics solutions for agriculture and horticulture

By: Duncan Ross

Farming has been embracing evolving autonomous technology for many years. Milking robots are now commonplace and accounted for 30% of all new installations in the UK in 2015 (Heyden, 2015). By that time, robotic milkers had been adopted by 5% of UK farms (ibid.).

Satellite navigation and variable rate application of fertiliser and seed, and chemical spraying using “green on brown” (only spraying green weeds identified in stubbles) or more latterly “green on green” (identifying target weed species in grass leys), are developments that have been based on existing machinery platforms which growers are comfortable with as they are seen to be familiar.

The leap to the next level of robotics and autonomy is a step most growers have yet to take, as barriers to adoption including integration, costs, and skills which all hamper uptake. Despite this, Agri-Tech developers are keen to move their products forward in their capability, learning from grower experiences and interactions, and breaking down those barriers.

One of the major reasons for robotics adoption is access to labour, both seasonal and full time, with rising wage pressures and competition from other sectors in the economy. This is especially apparent in the horticulture sector with many operations still requiring large numbers of people.

There is a vast range of alternative robotics solutions being created which can be categorised into different types:

Large autonomous platforms that perform the same functions as conventional tractor/implement combinations but without a driver, such as those from John Deere and CNH and a smaller offering from AgXeed. TAFE are developing an autonomous electric drive train tractor, and Hands-Free Farm have been converting conventional Iseki tractors to be autonomous during research projects at Harper Adams University, both adapting conventional smaller machinery.

Scouting for incidence of stress (heat, pests, disease, or weeds) has led several companies to develop combined or standalone solutions. Companies are also investigating how to mount sensors on robotic platforms to capture more representative data from pest and spore traps that are currently left in one position in a field.

Weeding such as Small Robot Company’s combined solution using two separate robots, one to map a field and another to treat it with low powered lasers. Standalone solutions from NAIO, BAKUS use machine vision and AI to identify and cultivate weeds, whilst Earthrover uses light systems for control. FarmDroid works in a different way as it plants crop and maps the precise location so that it can return post establishment and weed around the plant. Nissan have developed a Duckrobot that swims in paddy field and removes weeds.

Spraying of orchards with the GUSS robotic platform which is a direct replacement of tractor and driver. Robots that can identify pests and disease with artificial intelligence and on-the-edge processing will allow those infected areas to be treated and not the entire crop, saving significant cost in agrochemicals as well as being more environmentally sustainable.

Crop scouting being developed by Antobot to count fruit numbers in orchards and strawberry tunnels, assessing maturity and yield, providing data beneficial for resourcing of staff and accurate prediction of produce to marketing cooperatives and retail supply chains.

Soil sampling on robotic platforms from E-Nano and GMV NSL will give far greater granularity on soil nutrient status and possible organic matter content. By precision mapping a field, a robot can return to the same spot several years later and sample again, to ascertain how regenerative management practice may have improved soil health.

Harvesting is probably the hardest area to crack but also the greatest need for growers to save labour input. This could be picking top fruit with developments by Tevel, Octinion, Agrobot and RootAI, soft fruit with SAGA, Dogtooth and Field Robotics, asparagus with Muddy Machines, and broccoli with Earthrover. Currently the degree of computer processing power needed to replicate human hand-eye coordination means all the platforms are slow compared to existing picker rates and need further development and refinement before they can gain parity and be considered a viable alternative to an experience picker.

However, an area that is seen as really labour saving is the logistics platforms being developed by BurroAI, Antobot and Fox Robotics, where the harvested fruit is moved around the plantation by a robot, delivered to a central point and returning to the harvesting location with empty trays. This prevents the need for harvest staff carrying fruit to the central point and allows them to do what they do best which is keep on picking, thus maximising use of available labour.

Automation and robotics will have a wide impact on the agriculture and horticulture sector in the future, replacing humans in menial tasks, simultaneously creating higher skilled jobs attractive to different people. Data capture and processing will allow growers to have far more visibility of their growing crops, providing information for better decision making on targeted interventions of irrigation, fertiliser, Agro-chemicals, and labour resource. This will enhance financial and environmental farm businesses and assist the drive towards a net-zero agricultural sector.

Farming Innovation Pathways: LightWeeding

The LightWeeder is a world-first eye-safe, herbicide-free, carbon neutral, commercially viable weeding system delivered by lightweight autonomous field robots via UK agri-robotics company and Agri-EPI Centre member, Earth Rover.

The LightWeeding technology uses semiconductor LEDs to solve key technical, safety and commercialisation challenges faced by laser-based weeding systems.

The LightWeeder is part of CLAWS (Concentrated Light Autonomous Weeding and Scouting), Earth Rover’s agri robot that can kill weeds using a unique concentrated light method, and can also scout fields to obtain a complete data map of all crops after planting, showing the crops exact location, size, and any early signs of disease.

The main features of CLAWS are:

  • Weeding – chemical free and inherently safer than laser weeding. No till and no crop damage and can be used in any conditions without compacting the soil.
  • Scouting – In depth analysis of crops to allow better harvest predictions and increased yields

The complete system is ultra-lightweight (only 300kg) meaning it requires low amounts of energy to run, and is cheaper and more environmentally friendly than many of its competitors. It runs on batteries and (eventually) solar panels therefore uses no fossil fuels and helps farmers meet their net zero targets.

With increasing types of chemical-resistant weeds, a significant downturn in availability of hand labour plus a shift in society towards more organic options, now more than ever there is a need to change the way we farm. A recent report by Rothamsted Research shows weeds “pose an unprecedented threat to our food security” and highlights the need to diversify weed control as an urgent priority.

As explained by John Taylor, Farm Director at Pollybell Organic Farm,

“the key element here is that the LightWeeder not only makes chemical free farming more effective but it also solves the huge issue farmers are facing today in terms of the huge loss in labour force. Being able to weed fields autonomously means that food production doesn’t just grind to a halt.”

Lightweeding has several advantages over mechanical systems: it is energy-efficient and no-till, it does not damage drip irrigation or crops, it is not dependent on soil conditions, and it does not enable weeds to develop resistance. However, effective lightweeding must be low-cost, fast, and offer safe autonomous operation in modern farm environments – criteria that does not exist in-the market at this time.

Tag Archive for: autonomous

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