Nutrient

pH

Low

Medium

High

Organic carbon

< 0.5 %

0.5 - 7.5%

> 0.75%

Available nitrogen ( N)

< 240Kg/ha

240- 480kg/ha

> 480Kg/ha

Available Phosphorus (P)

< 11.0 Kg/ha

11 – 22 Kg/ha

> 22 Kg/ha

Available potassium ( K)

< 110Kg/ha

110-280Kg/ha

> 280Kg/ha

Soil Types

Acids

< 6.0

Normal to Saline

Normal

6.0 to 8.5

Tending to become Alkaline

Alkaline

8.9 to 9.0

> 9.0

Total Soluble Salts (Conductivity in milli mhos/cm2)

1-2

Critical for Germination

2-4

Critical for Growth of the Sensitive Crops

Above 4

Injurious to most crops