In land irrigability classification, Class 6 lands are completely unsuitable for sustained use under irrigation.

• Class-5: Lands temporarily non-irrigable, pending special engineering or economic feasibility studies.
• Class-4: Lands marginally suitable for specialized irrigation uses such as paddy cultivation or pastures.
• Class-6: Lands not suitable for sustained use under irrigation due to severe permanent physical, topography, or drainage limitations.
• Class-3: Lands with severe limitations for irrigation requiring intensive soil conservation and management.

• Dark brown / grey denotes Class VII land.
• Green denotes Class I land (best arable soil).
• Yellow denotes Class II land.
• Under the standard USDA Land Capability Classification (LCC) system, the standardized map color codes are: Class I (Green), Class II (Yellow), Class III (Red), Class IV (Blue), Class V (Dark Green), Class VI (Orange), Class VII (Brown), and Class VIII (Purple). Therefore, Class VI is designated by Orange.

• In the USDA Land Capability Classification, Class I soils have very few limitations restricting their use. They are deep, fertile, nearly level, and well drained (a), have high natural nutrient supplying power (c), and require only ordinary crop management practices and regular fertility maintenance to maintain high productivity (d). Moderate erosion hazards (b) are characteristic of Class II soils, whereas Class I soils have none or only very slight erosion hazards.
• incorrectly includes moderate erosion hazards.
• omits management feasibility.
• incorrectly includes moderate erosion hazards.