| dc.description | Water quality is just as an important factor for irrigated agriculture as its
quantity. Agricultural production must be maximized to meet a long term
demand for global food as well as fibre and raw materials for other industries.
Irrigated agriculture along with nutrient management and agronomic practices
play a vital role to enhance production. (Sarker et al. 2003). Quality water for
irrigated agriculture and its impact on soil properties is an important criterion
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 Northwest
Bangladesh. Moreover in some areas there is 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
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. | en_US |
| dc.description.abstract | Water samples were collected from shallow, deeptubwells, ponds and river from
Taraganj Upazilla under Rangpur District under the Agroecological Zone (AEZ)
no. 3 viz., Tista Meander Floodplain to evaluate their quality. Fifty samples were
collected from ground and surface sources to study its ionic constituent and
chemical prosperities and also to classify them according to their comparative
suitability for irrigation purpose. The chemical analysis included pH, TDS, anions
(HCO;, POs and SO and cations (Ca, Mg, Na, K, Mn, Cu, Fe and Zn). All water
samples were acidic in nature ( i.e.pH 6.5-6.9) and were not problematic for crop
production. Water samples were excellent and good in quality based on SAR and
SSP. As regards to TDS all water samples were rated as fresh water. In some
water samples HCO; and Mn ions were not Suitable for irrigation. The detected
concentrations of Zn, Cu and Fe were below the toxic levels and might not pose
threat to soil systems as irrigation water. All the collected samples were not
hazardous for irrigation on the basis of TDS and SO, concentration. The
relationship between water quality parameters like TDS, SAR, RSC, Hr and SSP
were established. Dominant synergistic relationship was observed between MgHCO; and SAR-SSP. The correlation between major ionic constituent like Ca, Mg,
K, Na, Zn, Mn, HCO3, SO4 and PO, differed significantly. | en_US |
