What is the zakat threshold for grains for one who cultivates land irrigated by lined (reinforced) rivers provided by the state, for which the farmer pays fees to the state, and is this land considered ba'l (rain-fed), sayh (naturally irrigated), or in-between?

The nisab (definition) (minimum taxable amount) for crops and fruits is five awsuq (plural of wasq). A wasq is sixty sa's, so the nisab is three hundred sa's. A sa' is five and one-third ratls (Baghdadi weight). This is the view of Malik, Al-Shafi'i, Ahmad, and the People of Hadith (definition). Abu Yusuf, a companion of Abu Hanifa, reverted to this opinion after the truth became clear to him. As for the amount of zakat (definition) due, it is one-tenth if irrigated by rainwater, rivers, or by roots absorbing water. It is one-half of one-tenth if irrigated by artificial means such as scooping, buckets, or waterwheels. As for canals and irrigation ditches dug from a large river, which require significant upkeep, the full one-tenth is due because their upkeep is not deducted from the zakat.