Arid Ecosystem
1. Western Himalayas, cold arid ecoregion, with shallow skeletal soils & length of Growing Period (GP)   <90 days
2. Western Plain, Kachchh and part of Kathiawar Peninsula, hot arid ecoregion, with desert & saline soils & GP <90 days
3. Deccan Plateau, hot arid ecoregion, with Red & Black soils & GP <90 days

Semiarid Ecosystem
4. Northern Plain and Central Highlands including Aravallis, hot semi-arid ecoregion, with Alluvium derived soils & GP 90-150 days
5. Central (Malwa) Highlands, Gujarat Plains & Kathiawar Peninsula, hot semi-arid ecoregion, with medium & deep Black soils & GP 90-150 days
6. Deccan Plateau, hot semi-arid ecoregion with shallow and medium (with inclusion of deep) Black soils & GP 90-150 days
7. Deccan (Telangana) Plateau and Eastern Ghats, hot semi-arid ecoregion, with Red & Black soils & GP 90-150 days
8. Eastern Ghats, TN uplands and Deccan (Karnataka) Plateau, hot semi-arid ecoregion with Red loamy soils & GP 90-150 days

Subhumid Ecosystem
9. Northern Plain, hot subhumid (dry) ecoregion, with Alluvium-derived soils & GP 150-180 days
10. Central Highlands (Malwa, Bundelkhand & Satputra), hot subhumid ecoregion, with Black and Red Soils & GP 150-180 (to 210) days
11. Eastern Plateau (Chhatisgarh), hot subhmid ecoregion, with Red & Yellow soils, & GP 150-180 days
12. Eastern (Chhotanagpur) Plateau and Estern Ghats, hot subhumid ecoregion, with Red & Lateritic soils & GP 150-180 (to 210) days
13. Eastern Plain, hot subhumid (moist) ecoregion, with Alluvium-derived soils & GP 180-210 days
14. Western Himalayas, warm subhumid (to humid with inclusion of perhumid ecoregion with Brown forest and Podzolic soils, & GP 180-210 + days

Humid-Perhumid Ecosystem
15. Bengal and Assam Plain, hot subhumid (moist) to humid (inclusion of perhumid) ecoregion, with Alluvium-derived soils & GP 210 + days
16. Eastern Himalayas, warm perhumid ecoregion, with Brown and Red hill soils, & GP 210 + days
17. North-eastern Hills (Purvachal), warm perhumid ecoregion, with Red and Lateritic soils & GP 210 + days 

Coastal Ecosystem
18. Eastern Coastal Plain, hot subhumid to semi-arid ecoregion, with Coastal Alluvium-derived soils & GP 90-210 + days
19. Western Ghats & Coastal Plain, hot humid perhumid ecoregion, with Red, Lateritic and Alluvium- derived soils and GP 219 + days

Island Ecosystem
20. Islands of Andaman-Nicobar and Lakshadweep hot humid to perhumid island ecoregion, with Red loamy and Sandy soils, and GP 210 + days