Is zakat obligatory on a crop of lentils and cumin, and what is its percentage if the agriculture is rain-fed, bearing in mind the existence of additional expenses for clearing the land of weeds?

Zakat (definition) is obligatory on every grain or fruit that is measurable and storable, such as lentils, cumin, wheat, and barley, even if it is not a staple food. This is the preponderant opinion. Regarding the zakat on what comes forth from the earth, one-tenth is obligatory if it is irrigated without cost, and half of one-tenth if it is irrigated with cost. Expenses and costs incurred for cultivation are not deducted from the obligatory zakat; rather, zakat is due on the entire produce.