Saviour et al.
0.0
0.15
0.13
0.07
0.05
26.59
5.40
26.99
0.5
0.73
0.69
0.65
0.63
31.89
6.92
34.59
21
1.0
0.79
0.71
0.69
0.64
38.68
8.30
41.51
1.5
0.94
0.92
0.88
0.80
44.05
9.52
47.59
2.0
1.03
0.98
1.00
0.87
54.88
11.7
58.76
Mean
0.73
0.69
0.66
0.60
39.22
8.38
41.89
0.0
0.13
0.11
0.05
0.03
26.57
5.38
26.89
0.5
0.71
0.67
0.63
0.61
31.87
6.90
34.49
30
1.0
0.77
0.69
0.67
0.62
38.66
8.28
41.41
1.5
0.92
0.90
0.86
0.78
44.03
9.50
47.49
2.0
1.01
0.96
0.98
0.85
54.86
11.7
58.66
Mean
0.71
0.67
0.64
0.58
39.20
8.36
41.79
Forms
A
B
C
D
E
Mean
F
Overall
range
0.13-1.03
0.11-0.98
0.05-1.00
0.03-0.81
26.57-54.28
5.38-11.75
26.89-58.76
Overall
mean
0.59
0.54
0.52
0.46
39.08
8.24
41.17
CV%
48.74
51.61
57.81
59.11
25.51
26.32
26.34
A. Non specifically adsorbed B, B. Specifically adsorbed B, C. Oxide bound B, D. Organically bound B, E. Residual B, F. Total B
Specifically adsorbed boron (Tables 2 and 3)
The specifically adsorbed boron fraction in soils of both the locations increased with levels of boron application and
reached a peak on 21st day of incubation. The boron level
Oxide bound boron (Tables 2 and 3)
at @ 2.0 kg ha -1 had increased the specifically adsorbed
The oxide bound boron fraction in soils of both the
boron content at 0, 7, 15, 21 and 30 days after incubation
locations increased with increasing levels of boron
(0.57, 0.60, 0.86, 0.98, 0.96 and 0.55, 0.58, 0.84, 0.96,
application and maximum release was found on 21st
0.94 mg kg -1 respectively in both the locations). From
day of incubation. The effect of different boron at @ 2.0
the beginning to end of the incubation period, both soils
kg ha -1 levels had increased the content at 0, 7, 15, 21
recorded the highest specifically adsorbed boron content
and 30 days after incubation (0.59. 0.62, 0.88, 1.00 and
with 0.98 and 0.96 mg kg -1 due to application of B @
0.98 mg kg -1 and 0.56, 0.59, 0.85, 0.97, 0.95 mg kg -1
2.0 kg ha -1 . Boron @ 2.0 kg ha -1 level had increased the
respectively in both the locations). From the beginning
specifically adsorbed boron content with 0.98 and 0.96 mg
to end of the incubation period, both soils recorded the
kg -1 and contributed 0.02 and 0.02 per cent respectively
highest boron content of 1.0 and 0.97 mg kg -1 on 21st
to total boron at 21 days of incubation. In general,
day of incubation. During the period of this incubation
increasing levels of boron increased their concentration
experiment, the oxide bound form of boron ranged from
in the soils. With respect to their contribution to total
0.05-1.00 and 0.02-0.97 mg kg -1 . The level of boron
boron, the released fraction was found to be minimum
at @ 2.0 kg ha -1 had increased the oxide bound boron
ranging from 0.11-0.98 and 0.09-0.96 mg kg -1 which
content with 1.0 and 0.97 mg kg -1 and contributed 0.02
might probably be due to the specifically adsorbed boron
and 0.02 per cent of total boron respectively at 21 days of
originates from weak binding sites of both organic and
incubation. At 30th day of incubation, this form showed
inorganic constituents, as confirmed with the findings of
a decreased trend which might be due the fact that oxide
Hoe et al., (1994).
bound boron fraction entered into tightly bound boron
512