| dc.description | Quality water for irrigated agriculture and its impact on soil properties is an
important criteria for the management of crop production. Water quality refers
to the characteristics of water supply that will influence its suitability for a
specific use i.e. how will the quality meet the needs of the users. During winter
season less rainfall and unequal distribution of rainfall affect on crop
production. The situation is turning from bad to worse which is common in the
North-West and South-West region of Bangladesh. Moreover in some areas
there are neither river nor Canals, therefore, the only option left with the farmers
_ is groundwater. 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, drinking and industrial uses.
Groundwater has played a strategic role in the continuous process of agricultural
development and also in the development of civilization (Armillas, 1961).
Irrigation is the practice in the sub-continent since time immemorial
(Annoymous, 1903). It is possible to increase the crop production by proper —
irrigation. In addition to relieving the moisture stress, irrigation water plays an
important role in controlling soil and air temperature, thereby making more
favorable environment for plant growth to facilitate the leaching of excessive
soluble salt. This may accumulate in the root zone, to soften tillage pan and to
provide crop insurance against short duration drought and also build-up
resistance to crop against many pest and diseases. | en_US |
| dc.description.abstract | A study was carried out to evaluate the quality of groundwater of 93
tube wells (HTW, STW and DTW) under phulbari upazila in the Dinajpur
district. The samples were chemically analyzed and classified on the basis
of their comparative suitability for irrigation, drinking and livestock
consumption. The chemical analyses included pH, EC, TDS, Ca, Mg, K,
Na, Fe, Mn, Cu, PO, and SO,. Water samples were acidic to neutral (pH
= 5.32- 7.00) and only 12 samples were found suitable for irrigation.
The EC and SAR categorized the water as low to medium salinity
(Cl & C2) and low alkalinity hazard with 'excellent' and good in quality
combinedly expressed as (CIS1) for 63 samples and (C2S1) for the rest 30
samples. TDS graded the waters as freshwater. SSP indicated that 51
water were good, 30 were permissible, 5 were excellent, 5 were doubtful
and the rest 2 were unsuitable. Categorized most of the waters as
suitable only four were marginal quality for irrigation. Iron, Cu, status of
all waters and PO, and SO, of some waters were not hazardous. Only 24
were found suitable for long-term irrigation based on Mn content.
Sixty three samples for Fe and 80 samples for Mn exceeded the
acceptable limits for drinking and the rest 30 samples for Fe and 13
samples for Mn were problematic, respectively. All waters were
unsuitable for aquaculture, poultry and brewing. Iron content of all
waters was unsuitable for aquaculture, brewing and paper and pulp
industries. Twenty-seven, 22 and 81 samples were suitable for poultry,
air-conditioning and textile. Eighty, 73, 68, 74 and 84 were unsuitable
for carbonated beverage, confectionery, ice manufacture, and
laundering and sugar industries, respectively. Considering Mn content,
66 waters were unsuitable for carbonated beverage and laundering.
Eighty-five 3, 25, 33, 16, 89 and 2 were suitable for air-conditioning
brewing confectionery, ice manufacture, tanning, textile as well as paper
and pulp, respectively. Sulphate status was graded as suitable for all
purposes. None of the waters alone were suitable for aquaculture poultry
and some industrial usage. The relationship between different water
quality criteria like pH, EC, TDS, SAR, SSP, and Hy were established
and the combinations such as pH vs EC, EC vs TDS, EC vs SAR, EC vs
H;, TDS vs SAR, TDS vs SSP, and SAR vs SSP show significant
positive correlation but the combinations like pH vs TDS, EC vs SSP,
TDS vs Hy, SAR vs Hr, and SSP vs Hy exhibited negative correlation. | en_US |
