On a five-acre piece of land being prepared for planting, James Mwenda shouts at his two oxen, commanding them to move in a straight line as they pull a ripper that cuts a long slit into the unploughed ground.
The “low-till” farming system – in which land is no longer ploughed and seeds are slotted into largely undisturbed soil – is gaining fans in drought-hit Kenya because it helps preserve moisture in the soil.