||TECHNIQUES OF SOIL FERTILISATION
||Field Building Through Flood Diversion and Silt Catchment
||Phoenix Basin , United States of America, North America
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|Continent: North America
Country: United States of America
Site: Phoenix Basin
Description of the local variant of the technique
This is a technique utilized by the ancient Hohokam, who inhabited the Southwest until around 1400 CE. Agricultural soil was improved by capturing silt from floodwater.
In this technique, floodwater from flash-flood events is diverted onto fields where specialized bush alignments act as filters or nets, slowing the water and causing silt to be deposited over the field.
Desert soil, which is in its natural state poor agricultural soil, is improved by the addition of nutrient-bearing silt. Composition of the soil is improved, combined with direct floodwater irrigation and injection of nutrients. Soil is much improved for agricultural use, allowing community to grow crops more effectively.
1) Schaafsma, Hoski, and John M. Briggs. "Hohokam Field Building." Kiva 72.3 (2007): 369-91. Web.