Group

Indicator

Unit

Organic ± SE

Conventional ± SE

Physical indicators

Bulk density

kg/l

1.14

±

0

1.10

±

0

Clay

%

19

±

1

24

±

2.1

Sand

%

50

±

1.3

43

±

1.7

Silt

%

31

±

0.9

33

±

0.8

WSA

%

90

±

0.7

85

±

0.9

Chemical indicators

NH₃-Nitrogen

mg/kg

2.64

±

0.3

2.08

±

0.1

Available potassium

mg/kg

167

±

25.3

431

±

131.5

Boron

mg/kg

1.3

±

0.1

1.7

±

0.3

Calcium

meq/100g

9.1

±

0.7

10.1

±

0.8

Cation exchange capacity

meq/100g

12.2

±

1.2

13.6

±

1

Chloride

mg/kg

12.1

±

1.8

33.5

±

16.6

Copper

mg/kg

5.6

±

1.3

4.5

±

1

Electrical conductivity

µS

51

±

2.6

106

±

6.8

Iron

mg/kg

51

±

10.1

25

±

5.3

Labile C

g/kg

0.62

±

0

a

0.37

±

0

b

Magnesium

meq/100g

2.3

±

0.2

2.4

±

0.2

Manganese

mg/kg

35.8

±

5.8

47.5

±

6.9

NO₃-Nitrogen

mg/L

7.4

±

0.7

11.6

±

1.2

Organic carbon

%

2.4

±

0.2

2.1

±

0.1

pH

6.65

±

0.1

6.75

±

0.1

Phosphorouos (Colwell)

mg/kg

129

±

24.5

241

±

42.3

Phosphorous buffer index

247

±

48.6

325

±

40.2

Potassium

meq/100g

0.42

±

0.1

1.25

±

0.3

Sodium

meq/100g

0.067

±

0

0.047

±

0

Sulphate sulfur

mg/kg

15.5

±

2.2

b

63.5

±

11

a

Zinc (DTPA)

mg/kg

12

±

3.5

12

±

1.6