Dressed in brown overalls, gumboots and a hat, John Njeru kneels and scoops up a handful of soil at his small farm in central Kenya, where he grows tomatoes, spinach and carrots.
"Not only has there not been enough rain in the past few months, it's also been unevenly distributed," he said, picking through the earth in his hand. "This destroys our crops."
Dealing with more unpredictable and irregular rainfall associated with climate change is a challenge for many farmers, and one made worse by water-wasting, inefficient irrigation systems, experts say.
But scientists from Kenya's Meru University of Science and Technology have come up with one way to deal with the problem: a mobile app that monitors the need for water in fields and controls irrigation equipment to deliver just what is needed.