Alkali soil are reclaimed by the addition of

A soil reclamation is a process of reclaiming the soil's quality like lost fertility, minerals, nutrients and moisture to make it fit for intensive use again.
The alkali-rich soils are reclaimed by the process of leaching, crop rotation and also by the addition of gypsum.
Gypsum is the major soil amendment used to reclaim alkali soils. Gypsum is a soft sulphate composed of calcium sulphate dehydrate.