Could robot weedkillers replace the need for pesticides?

Autonomous, artificial intelligence robots are increasingly being deployed on US farms to tackle weeding and other field work. Photograph: Aigen

On a sweltering summer day in central Kansas, farm fields shimmer in the heat as Clint Brauer watches a team of bright yellow robots churn up and down the rows, tirelessly slicing away any weeds that stand in their way while avoiding the growing crops.

The battery-powered machines, 4ft (1.2 metres) long and 2ft (0.6 metres) wide, pick their way through the fields with precision, without any human hand to guide them.