Sub-Saharan Africa’s agricultural output may rise 2.6 percent annually through 2025, boosted by productivity improvements. “Faster technology adoption associated with the emergence of medium-scale producers and integration of smallholder producers into the value chain” will raise production growth even as area expansion slows, the Organization for Economic Cooperation and Development and the United Nations’ Food & Agriculture Organization said in a joint report Monday. Despite improvements, significant gaps remain and imports of most primary food…