INTERPRETATION

1. Physico-chemical parameters

Parameters

Status

Interpretation

pH

<  5.5

Highly acidic

 5.5 – 6.5 

Acidic

6.5 – 7.5

Neutral

7.5 – 8.5

Alkaline

             >  8.5

Highly alkaline

EC

(dSm-1)

             <  0.8

Normal for all crops

0.8 – 1.6

Critical for salt sensitive crops

                                   1.6 – 2.4

Critical for salt tolerant crops

                      >  2.4 

Injurious to all crops

2. Chemical parameters

Parameter

Unit

Low

Medium

                   High

OC

%

< 0.50

0.50 – 0.75

                    >  0.75

N

kg ha-1

< 272

272 – 544

                  >  544

P

kg ha-1

< 11.2

11.2 – 22.4

              >  22.4

K

kg ha-1

< 137

137 – 337

                 >  337

S

kg ha-1

< 22.4

22.4 – 45.0

                     >  45.0

Ca

mg kg-1

< 150

150 – 300

                   >  300

Mg

mg kg-1

< 50

50 – 100

                  >  100

Na

mg kg-1

N.A

N.A

                      N.A

3. Micronutrients (mg kg-1)

Limit

Zn

Cu

Fe

Mn

B

Very low

0-0.5

0-0.1

0-2

0-0.5

-

Low

0.5-1

0.1-0.3

2-4

0.5-1.2

<  2.0

Medium

1-3

0.3-0.8

4-6

1.2-3.5

 2.0

High

3-5

0.8-3

6-10

3.5-6

>  2.0

Very high

>  5

>  3

>  10

>  6

-

4. Toxic elements

     Parameter

                                                                       Status

Interpretation

   Pb

                                                              <  300 mg kg-1

Safe limit

   Ni

                                                              <   75 mg kg-1

Safe limit

   Cd

                                                              <     3 mg kg-1

Safe limit

   Cr

                                                              <   150 mg kg-1

Safe limit

5. Microbiological parameters

                              Parameters

Status

        Low

    Medium

  Sufficient

                                Bacteria

         1 x 101 - 1 x 102

    1 x 103 - 1 x 104

           >  1 x 105

                                               Fungi

        1 x 101

    1 x 102

           >  1 x 103

                                       Azotobector

       1 x 101 - 1 x 102

    1 x 103

           >  1 x 104

                                         Rhizobium

        1 x 101 - 1 x 102

    1 x 103

           >  1 x 104

                              Phosphate

                   Solubilizing  Bacteria                      

       1 x 101 - 1 x 102

    1 x 103 - 1 x 104

           >  1 x 105

                                       Azospirillum

       1 x 101 - 1 x 102

    1 x 103 - 1 x 104

           >  1 x 105