APPRAISAL OF SALINITY/SODICITY PARAMETERS IN THE SOILS OF SOUTH SAURASHTRA AGRO-CLIMATIC ZONE
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Date
2023-10
Authors
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Journal ISSN
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Publisher
JAU JUNAGADH
Abstract
An attempt has been made in the present investigation to study the
salinity/sodicity parameters of Gujarat by collecting 270 surface soil samples from the
farmer’s cultivated field during summer, 2021.
The present investigation was carried out for the appraisal of soil
salinity/sodicity parameters in the soils of South Saurashtra Agro-climatic Zone. For
this purpose, 270 surface soil samples were collected from 6 districts (10 soil samples
from each taluka) of South Saurashtra Agro-climatic Zone viz., Junagadh, Gir
Somnath, Amreli, Bhavanagar, Porbandar and Rajkot. Soil samples were analyzed for
chemical properties.
On the basis of analyzed data of soil samples, collected from different districts
of South Saurashtra Agro-climatic Zone of Gujarat, it can be concluded that the range
of water soluble cations Ca++, Mg++, Na+
and K+ were 0.69 to 7.20 me L-1
, 0.40 to
12.98 me L-1
, 1.09 to 149.32 me L-1
and 0.01 to 1.04 me L-1 with mean values of 2.73,
2.61, 14.32 and 0.15, respectively recorded in the soils of South Saurashtra Agro climatic Zone. Similarly, in respect of water soluble anions like CO3
2-
, HCO3
-
, Cl and
SO4
2-
in range of 0.00 to 4.80 me L-1
, 0.40 to 9.90 me L-1
, 1.25 to 149.30 me L-1
and
0.00 to 7.98 me L-1 with mean values of 0.28 me L-1
, 3.46 me L-1
, 14.99 me L-1
and
1.07 me L-1
respectively also observed in this zone. The dominance order of water
soluble cations Na+>Ca++>Mg++>K+
and water soluble anions Cl
->HCO3
2->SO4
2-
>CO3
2- were recorded.
The overall exchangeable Ca++ values of South Saurashtra’s soil samples were
ranged from 8.80 to 36.80 (cmol (p+
) kg-1
) with the mean value of 21.40 (cmol (p+
)
kg-1
). Among the different districts falls under South Saurashtra Agro-climatic Zone,
overall mean value of exchangeable Mg++ was [13.70 (cmol (p+) kg-1
)]. Exchangeable
Na+
levels in the South Saurashtra Agro-climatic Zone ranged from 1.70 to 51.40
cmol (p+
) kg-1
, with a mean of 6.30 (cmol (p+
) kg-1
). The overall value of range of
Abstract
exchangeable K+
in South Saurashtra Agro-climatic Zone was 0.10-1.70 (cmol (p+
)
kg-1
) with mean value of 0.40 (cmol (p+
) kg-1
). The dominance order of exchangeable
cations Ca++>Mg++>Na+>K+ was recorded. The overall mean value of EC2.5 of South
Saurashtra Agro-climatic Zone was 0.59 dS m-1
and it was ranged widely from 0.14 to
5.15 dS m-1
. In general, the soil samples of South Saurashtra Agro-climatic Zone
showed pH2.5 value ranging from 6.74 to 8.84 with a mean value of 7.97. Soluble
sodium percentage ranged from 11.72 to 96.30 in the South Saurashtra Agro-climatic
Zone, with a mean value of 64.62. The exchangeable sodium percentage was found in
the range of 4.20 to 59.00 in the South Saurashtra Agro-climatic Zone, with a mean
value of 15.00. The overall range of cation exchange capacity was 20.10 to 87.10
cmol (p+
) kg-1 with the mean value of 41.80 cmol (p+
) kg-1
. The overall reserve lime
content was ranging from 10.00 to 475 g kg-1 with mean value of 128.50 g kg-1
indicating the normal to slightly calcareous nature of the soil.
The soil samples of South Saurashtra Agro-climatic Zone were found about
61.11, 19.25, 18.11 and 1.48 per cent to tend to be saline (0.25 to 0.75 dS m-1
), saline
(0.75 to 2.25 dS m-1
), be normal (<0.25dS m-1
), and highly saline (>2.25 dS m 1).
about 53.70, 40.37, 5.92 and 0.00 per cent to be normal (<8.0), Alkaline (8.0 to 8.5),
Alkali (8.5 to 9.0) and highly alkali (>9.0), about 51.85% , 45.55% and 2.22% to be
non alkaline, slightly alkaline and moderately alkaline and about 35.92% and 64.07%
soils to be good and fair category, respectively. The soils of South Saurashtra Agro climatic Zone were normal (34.07%) followed by slightly calcareous (31.48%) in
nature and cation exchange capacity was 41.80 cmol (p+
) kg-1