[1] Nüzül was designed as a form of requisitioning from farms, to feed Ottoman armed forces; large quantities of food were needed to support Ottoman armies in the field.
Producers were expected to deliver nüzül to the required destination, and were not paid for this.
Nüzül was supervised by the local kadis,[2] an official who acted as both a judge and a tax-collector; Ottoman central government determined the kadi's jurisdiction, and set the levels of taxes to be collected[3] - they were even required to arrange supplies of ship biscuit, in parallel with nüzül provision.
A waqf might be founded to help a specific community pay their nüzül and avariz obligations.
Nüzül collection, as an irregular tax, began at least as early as the start of the 16th century.