Research on the Engaruka fields has thus far focused on documenting the distribution of different agricultural features and reconstructing the agricultural technology of this field system. It is now appropriate to apply various soil and environmental studies developed in the American Southwest to evaluating soil productivity and agricultural sustainability of the Engaruka fields. Recent soil studies in the Southwest have found that cultivation can alter physical and chemical soil properties such as bulk density, air and water permeability, pH,
and organic matter content, and that these changes may enhance or degrade soil productivity. The Engaruka fields are well suited for a similar soil study because: (1) soil formation proceeds slowly in this semiarid climate, so soil changes caused by cultivation are likely to persist and be detectable; (2) many field areas have not been cultivated since the fields were abandoned, so modern farming practices have not masked or erased soil properties reflecting ancient use; and (3) the presence of agricultural features and terraces provides important clues for discerning and sampling cultivated and uncultivated soils. Other types of environmental
studies, including paleohydraulic reconstructions of canals, stream flow reconstructions, and geomorphic and dendroclimatological studies, also have strong research potential for modelling agricultural sustainability of the Engaruka fields.
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Key Words: Engaruka, soil chemistry, agricultural history, Southwest USA