TITLE:
Comparison and Evaluation of Two Analytical Methods for Cation Exchange Capacity and Exchangeable Sodium Percentage of Five Soil Types in Central Sudan
AUTHORS:
Jamal Elfaki, Mohamed Gafer, Magboul Sulieman, Mushtaha Ali
KEYWORDS:
Ecological Regions, Central Sudan, Cation Exchange Capacity, Exchangeable Sodium Percentage
JOURNAL NAME:
Open Journal of Soil Science,
Vol.5 No.12,
December
21,
2015
ABSTRACT: Twenty-six
soil samples were collected from five soil profiles at different climatological
and ecological regions in central Sudan. Soil profile was dug in each studied area
and morphological profile description was carried out for different horizons. All
samples were analyzed using two different methods to determine Cation Exchange Capacity
(CEC) and exchangeable sodium percentage (ESP). Statistical analysis (T-test) was
used in order to investigate the differences between soil samples for the studied
locations. Significant differences appeared when compared the two methods for CEC
determination at Gedaref area, Wad Medani and Nile flood plain and that appeared
in evaluation of ESP at Nile flood plain and Shambat area. The results also revealed
that, the developed method used in this study was more practical, simple and reliable
for determination of CEC and ESP as the currently used in most soil laboratories.
In addition, it will be safer than the other methods in some problematic soils.
The adoption of this developed method is advisable because it is less time consuming
as it omits the washing step. In contrast, the old method cannot be a good substitute
in laboratories which have no possibility to determine sodium by using flame photometer.
We conclude that when the developed method is used to determine CEC and ESP time
will be saved, that fewer amounts of chemicals will be used and that accurate results
will be achieved.