| dc.description | Groundwater is an important resource throughout the world. Particularly, in
tropical countries like Bangladesh, where a vast majority of the population
depends on it for irrigation uses. Groundwater has played a strategic role in
the continuous process of agricultural development and also in the
development of civilization . Irrigation is the practice in the sub-continent
since time immemorial. It is possible to increase the crop production by
proper irrigation. In modern agriculture, judgment of water quality is
essential for irrigating various crops grown in the world. Groundwater is the
major source of irrigation, although surface water is also used on a limited
scale in some rural areas. And thus the concentration and composition of
dissolved constituents in water are an important determinant concerning its
quality. The water that runs off the fields carries with sediments, fertilizers,
herbicides, pesticides (if these chemicals are used on the fields) and natural
salts leached from the soil and enters rivers, lakes and groundwater supplies.
As often the Case with water use, when the water returns to the stream or
water body, the quality has been lowered. Soil properties, crop yield and
quality will be deteriorated if low quality water is used for irrigation. | en_US |
| dc.description.abstract | Groundwater samples collected from Saidpur Upazilamunder the district of
Nilphamari, Bangladesh during dry season of the year 2012 were analyzed for its quality and
suitability for irrigation and drinking purposes. To study the various chemical parameters,
water samples were 25 shallow tubewell and 25 deep tubewell. Analyses included pH, EC,
cations (Ca’*, Mg”*, Na‘, K*, Zn’*, Cu’*, Mn** and Fe**), anions (HCO;", NO3", SO.”", PO.*”
and CI) and TDS (total dissolved solids). We also computed several variables such as SAR
(sodium adsorption ratio), SSP (soluble sodium percentage) RSC (residual sodium
carbonate), hardness, permeability index, permeability salinity, Kelly’s ratio and Gibbs ratio
to evaluate the suitability of groundwater supply for specific use. Some correlations and
compositional relations were also evaluated. Overall we found that all the groundwaters were
acidic in nature (pH 6.0 - 7.7) and could be suitable for drinking and irrigation uses.
According to TDS and SAR values, all samples were classed as ‘freshwater’ and ‘excellent’
categories. The soluble sodium percentage (SSP) of all waters was under ‘excellent’ and
‘good’ classes. Maximum samples were within ‘soft’ class regarding hardness with ‘suitable’
RSC. Based on Zn?*, Mn?*, Fe**, SO,””, NO3" and CI, all groundwater samples were within
the ‘safe’ limit for drinking. The results also provided data for water quality of groundwater
resources of study region to match national and international standards for drinking and
irrigation ways. | en_US |
