Reconstructing Agricultural Intensification at Kufena Hill, Zaria, Kaduna State Using Phytolith Analysis

Agricultural intensification, characterized by increasing investment in land modification, crop specialization, and yields per unit area, is a pivotal process in the development of surplus-producing political economies in pre-colonial West Africa, yet its direct material evidence at specific sites remains difficult to recover through conventional archaeobotanical methods. This study reconstructs evidence for agricultural intensification at Kufena Hill, an important pre-colonial occupation site in Zaria, Kaduna State, using phytolith analysis of sediment samples from a sequence of stratified deposits spanning approximately eight hundred years. Phytoliths, microscopic silica bodies precipitated within plant cells that survive in archaeological sediments long after organic material has decomposed, were extracted from sixty-four samples using standard processing protocols and identified to plant group and morphotype using published reference collections. The phytolith sequence reveals a significant increase in cereal grass phytolith frequency and morphotype diversity in phases dating to after approximately 1000 CE, accompanied by a marked increase in ash phytoliths interpreted as evidence for field burning and soil management practices. The diversification of cereal morphotypes in later phases suggests both the introduction of new varieties and increased cultivation intensity, consistent with a model of agricultural intensification driven by population growth and surplus production demands. Wild grass phytolith frequencies decline correspondingly in later phases, providing evidence for progressive landscape clearance. These findings contribute to a growing body of phytolith-based agricultural history in the Central Sudan. Keywords: phytolith analysis, agricultural intensification, Kufena Hill, Zaria, Kaduna State.