Treatments

Soil pH

(1:5 with H₂O)

EC

(dS/m)

OM

(%)

T-N (%)

Av-P (ppm)

Av. S

(ppm)

Exchangeable cations

(meq./100g)

Water soluble Fe (mg/kg)

Water soluble

${\text{SO}}_4^{2-}$ (mg/kg)

Na⁺/K⁺

Na⁺/Ca²⁺

Ca

K

Na

T₁: Rice sole cropping without NPKS, and no soil amendments

7.8

7.6

1.9

0.11

29.8

18.6

1.9

0.41

4.8

1.1

21.5

11.7

2.51

T₂: Rice sole cropping, FP without soil amendments

7.75

7.5

2.1

0.43

31.6

20.5

2.5

0.49

4.7

1.5

25.6

9.6

1.90

T₃: Rice sole cropping, FP with PG

7.65

6.5

2.6

0.49

33.5

23.6

3.3

0.58

4.3

2.1

33.3

7.4

1.30

T₄: Rice-Shrimp mixed culture with PG

7.67

6.2

2.8

0.55

35.6

25.5

3.5

0.60

4.4

2.6

38.5

7.3

1.25

T₅: Rice-Crabs mixed farming with PG

7.50

6.4

2.7

0.65

36.3

27.3

3.6

0.61

4.7

2.9

41.7

7.4

1.27

T₆: Rice-Shrimp mixed farming + PG with Spirulina

7.60

6.0

3.15

0.69

37.6

28.5

4.0

0.69

4.6

3.1

53.6

7.1

1.15

T₇: Rice-Crabs mixed farming + PG with Spirulina

7.68

6.2

3.10

0.68

38.3

29.7

4.3

0.67

4.9

3.3

57.3

7.6

1.13

LSD_0.05

0.15

0.25

0.41

0.13

2.8

2.6

0.9

0.15

0.20

0.17

5.6

1.3

0.15

Level of significance

ns

*

*

*

*

**

**

*

**

***

**

**