Machines that delivers fertilizer to soil around roots, kill weeds

Faced with seesawing commodity prices and the pressure to be more efficient and environmentally friendly, farmer Jamie Butler is trying out a new worker on his 450-acre farm in England’s Hampshire countryside.

Methodically inspecting Mr. Butler’s winter wheat crop for weeds and pests, the labourer doesn’t complain or even break a sweat. That’s because it’s a four-wheel robot dubbed “Tom” that uses GPS, artificial intelligence and smartphone technology to digitally map the field.

Agri-tech boom

Tom’s creator, the Small Robot Company, is part of a wave of “agri-tech” startups working to transform production in a sector that is under economic strain due to market pressures to keep food cheap, a rising global population and the uncertainties of climate change. Most robots are still only being tested, but they offer a glimpse of how automation will spread from manufacturing plants into rural areas.

“If we can keep our costs to an absolute minimum by being on the leading edge of technologies as one method of doing that, then that’s a really, really good thing,” said Mr. Butler, one of 20 British farmers enlisted in a yearlong trial.

Next year, the British startup plans to start testing two more robots controlled by an artificial intelligence system that will work alongside Tom, autonomously doing precision “seeding, feeding and weeding.”

The aim is to drastically cut down on fertilizer and pesticide use to lower costs and boost profits for struggling farmers. As such, it not only helps economically, but it also lowers the environmental impact of farming.

“What we’re doing is stuff that people can’t do,” said Ben Scott-Robinson, co-founder of the company . “It’s not physically possible for a farmer to go round and check each individual plant and then treat that plant individually. That’s only possible when you have something as tireless as a robot and as focused and accurate as an AI to be able to achieve that.”

Next step

Commercial sales of the full, multi-robot system is still years away, with larger-scale testing planned for 2021. They represent the next step in the evolution of automation for farms. Self-driving tractors and robotic milking machines have been in use for years and, more recently, unmanned aerial drones that monitor crops have gone into service.

Eventually, farms “will be able to automate virtually everything,” said Tim Chambers, a farmer who’s not involved in the trial. Some jobs are harder to automate, such as harvesting delicate raspberries or strawberries by hand, but even that is coming, said Mr. Chambers.

Florida’s Harvest Croo Robotics, Spain’s Agrobot , Britain’s Dogtooth Technologies and Belgium’s Octinion are all developing berry-picking bots.

A more fundamental problem “will be the cost of building those robots and the research that has to go into making them,” Mr. Chambers said. The low cost of air freight could still make it cheaper to, for example, fly in fruit from other countries where labour is cheaper, he said.

To ease financial pressure on farmers reluctant to make big one-off investments in equipment, the Small Robot Company plans to sell its services as a monthly subscription, charging 600 pounds ($765) per hectare a year.

On Butler’s farm, Tom trundles along crop rows taking high-resolution pictures during the growing season. The images are fed to Wilma, the artificial intelligence platform, which is being trained to tell the difference between wheat and weeds.

In 2019, the company will start trials for two more robots, Dick and Harry. Dick will deliver fertilizer directly to soil around roots, instead of wasteful blanket spraying, and use a laser or micro-spray chemicals to kill weeds. Harry will insert seeds into the earth at a uniform depth and spacing, eliminating the need for tractors to plow furrows.