Guardian: In God’s fields rats are the problem. They crawled under the old maize stalks that Paul Kiongo Thuo carefully placed on his soil as mulch, as the missionary had shown him, and ate the seeds he had planted in neat rows the day after the rains came. Thuo killed seven of the rodents, but more have moved in. Perhaps it is best to let the seeds germinate first before laying down the mulch, his wife Grace suggests as they stand in the middle of their four-acre farm, where they also grow beans, …