Q. Consider the following interventions for soil reclamation:

1. Pyrite application
2. Gypsum amendment
3. Incorporation of Organic Manure

Which of the above can be effectively used in the reclamation of alkali soil?
Answer: All 1, 2 and 3
Notes: All three—Pyrite, Gypsum, and Organic Manure—are effective in alkali soil reclamation. Pyrite oxidizes to produce sulphuric acid, aiding in reducing soil alkalinity. Gypsum supplies calcium, displacing sodium from soil colloids. Organic manure improves soil structure, microbial activity, and water retention, collectively enhancing physical and chemical soil properties.