SciDevNet: Growing leguminous trees on maize farms — a form of agroforestry — can boost and stabilise maize yields, a 12-year study in Malawi and Zambia has found. The researchers behind the study, from the Kenya-based World Agroforestry Centre and the University of Pretoria, South Africa, say this is the first analysis of long-term crop yield trends in cereal-legume agroforestry systems in Southern Africa. Maize is a common staple in the region and is grown in more than half of cultivated land in countries…