The five: robot farmers

Will robots be the answer to labour shortages on farms? Our pick of the best planting, weeding and harvesting machinesLast week a startup based at Plymouth University unveiled the world’s first raspberry-picking robot. The machine can pick about 25,000 berries a day, which is 10,000 more than a human during an eight-hour shift. Raspberries are particularly challenging for machines to harvest because the robots have to identify ripe fruit and handle the soft berries without damaging them. T