Zaï

Sahelian farming technique

Zaï or tassa is a farming technique of digging pits in less permeable soil to catch water and concentrate compost. The pits are between 15 and 50 centimetres across and around 5 to 15 centimetres deep, spaced approximately 80 centimetres (3 ft) apart. The technique is traditionally used in western Sahel to restore degraded drylands and increase soil fertility.

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