# Blue River and its farm robots harvest another $10M Startup Blue River Technology — the brains behind a weed-pulling, machine-learning lettuce robot — have raised another round of$10 million to hire new scientists and engineers and develop new robotic products for agriculture. Data Collective Venture Capital led the round, which also included Eric Schmidt’s Innovation Endeavors, and Khosla Ventures.

The company’s lettuce bot rolls slowly (1 mile per hour) down a row of lettuce plants, with a camera pointed at the ground. One set of algorithms determines whether or not the robot is seeing a plant, another set of algorithms determines if the plant is a weed or not (to about 98 or 99 percent accuracy) and a third set of algorithms determines when the correct moment is to inject the deadly dose of fertilizer on the weed.

The idea is that the lettuce bot can remove weeds without human labor and do it much more efficiently. It’s also an example of how humans can use machine learning and computer vision to adapt machines to do more and more tasks for humans.

As the population grows to 9 billion by 2050, farms will need to be able to produce more food, more efficiently, for more people. Some of that added efficiency will come from digital tools, like sensors, robotics, big data and drones. So-called “precision agriculture” is an increasingly hot area for startups and investors.

Three-year-old Blue River Technology is also developing its robotics for other row crops, like soy beans and corn.