Saviour et al.

A

B

C

D

1.20

0.80

0.40

0.00

0

1

2

0

1

2

0

1

2

0

1

2

0

1

2

B Levels (kg ha -1 )

A.Non specifically adsorbed B, B. Specifically adsorbed B, C. Oxide bound B, D. Organically bound B,

Fig. 1. Distribution of different forms of boron (mg kg-1) in soils of the incubation study – Location I

Table 1. Physico chemical characteristics of initial soil

S. No.

Soil test parameters

Location - I

Location - II

Mechanical analysis

Test values

Test rating

Clay (%)

16.3

15.1

Silt (%)

21.0

18.5

1

Fine sand (%)

23.2

26.1

Sandy clay loam

Coarse sand (%)

39.2

40.1

2

pH (1:2.5 soil : water)

6.42

6.67

Near neutral

3

EC (dSm -1 )

0.08

0.09

Low

4

Organic Carbon (%)

0.33

0.29

Low

5

Alkaline KMnO4- N (kg ha -1 )

294

289

Low

6

Olsen- P (kg ha -1 )

15.4

15.2

Medium

7

Neutral N NH4OAc.K (kg ha -1 )

252

249

Medium

8

DTPA Zn (mg kg -1 )

0.82

0.80

Deficient

9

DTPA Cu (mg kg -1 )

1.37

1.71

Sufficient

10

DTPA Fe (mg kg -1 )

14.2

16.8

Sufficient

11

DTPA Mn (mg kg -1 )

8.30

9.10

Sufficient

12

Hot Water Soluble B (mg kg -1 )

0.28

0.26

Deficient

510