Jemitias Denhere shakes his head as he explains why, despite being a specialist in soil management and crop production, he specializes in beef livestock. The district agronomist -- plants specialist -- owns 27 hectares of land in the Mwenezi area of southern Zimbabwe, a particularly arid location. Here, farmers endure extreme weather challenges such as drought and flash flooding -- and, thus, some of the highest food shortages. His cattle can exist on the little grass that remains during dry times, but to produce crops without irrigation is risky -- so he decided against it. "One year, you win; one...