scholarly journals Salinity variation of south-western coastal region of Bangladesh in response to discharge from an upstream river

2020 ◽  
Vol 8 (2) ◽  
pp. 173
Author(s):  
Md . Shibly Anwar ◽  
Md. Zakir Hasan ◽  
Kalimur Rahman
Keyword(s):  
River Flow ◽  
High Salinity ◽  
Coastal Region ◽  
Dry Season ◽  
Salinity Level ◽  
Western Region ◽  
The South ◽  
Discharge Data ◽  
The Ganges ◽  
High Salinity Level

Long term variation in upstream water flow through the Ganges−Gorai river are affecting the salinity levels of south-western coastal region of Bangladesh. Salinity data for the Rupsha river was collected for several years to demonstrate the historical changes of salinity level in the south-western coastal region. Furthermore, discharge data of the Ganges and Gorai river were also collected to discuss the effect of upstream discharge on the variation of salinity level. This study also collected water and soil samples from different places of this region to measure the salinity level and compare the values with the standard ones. A decreasing trend in dry season Ganges-Gorai river flow was observed after the initiation of the Farakka barrage in 1975. Consequently, the south-western region underwent high salinity level. The Ganges sharing treaty in 1996 and dredging of the Gorai riverbed (GRRP-I and GRRP-II) in 1999 and in 2012 helped the region to recover from high salinity level for a certain period. The salinity level of the collected water samples was in alarming level but soil sample was not in so frightening condition in 2015. Results suggested that to maintain the salinity level of south-western region within the acceptable limit for drinking, fisheries, and cultivation purposes, approximately 80 m3/s Gorai river discharges required at dry season. To do that, it is necessary to ensure 1200 m3/s discharge through the Ganges river at the Hardinge Bridge point. To protect the vital south-western region, it becomes necessary to optimize flow augmentation in the Ganges-Gorai river and to continue the further phases of restoration project in the future.   

The potassium status of some coarse textured soils of the south western region of Western Australia

1961 ◽  
Vol 1 (1) ◽  
pp. 11
Author(s):  
DP Drover
Keyword(s):  
Hydrochloric Acid ◽  
Plant Growth ◽  
Western Australia ◽  
Coastal Region ◽  
Western Region ◽  
Exchangeable Potassium ◽  
Potassium Fertilizer ◽  
The South ◽  
Exchangeable K ◽  
South West

The total, hydrochloric acid soluble, and exchangeable potassium contents of two soils typical of large areas of the south-west coastal region of Western Australia and of two soils in this region which had received varying levels of potassium fertilizer were determined. It was found that all four soils were low in exchangeable K, containing less than 60 lb exchangeable K per acre in their surface three inches. One of the soils had an exchangeable K content of 0.21 m-equiv. per cent after 2 cwt KCl per acre and another 0.08 m-equiv. per cent after 1 cwt KCl per acre had been applied and satisfactory pasture growth had been made. These values are lower than those reported elsewhere for satisfactory plant growth. One soil, extremely low in exchangeable K and which responded to potassium fertilizer, was found to contain the high total K content of 1 per cent. Mineralogical examination disclosed that almost the whole of this was present as feldspar.

Mālvan—Further Light on the Southern Extension of the Indus Civilization

1970 ◽  
Vol 102 (1) ◽  
pp. 20-28 ◽  
Author(s):  
F. R. Allchin ◽  
J. P. Joshi
Keyword(s):  
Coastal Region ◽  
Single Site ◽  
Archaeological Survey ◽  
The South ◽  
Indus Civilization ◽  
The Past ◽  
The North ◽  
Principal Directions ◽  
Three Stages ◽  
The Ganges

In 1947 partition left India without a single site attributable to the Indus civilization. During the past two decades there has been a considerable extension of our knowledge, due mainly to the explorations and excavations of the Archaeological Survey of India. It now appears as though the Harappan culture spread into India in two principal directions: north-eastwards into the eastern Panjāb and across the Indo-Gangetic divide into the plains that lie between the Ganges and Jamunā rivers; and south-eastwards into Kacch and Kāṭhiāwār, and thence perhaps inland towards southern Rājāsthān and into the coastal region of Gujarāt. In the north the principal sites are at Rūpar in the Panjāb, Alamgīrpur in U.P., and Kālibangan in north Rājāsthān. In the south the principal excavated site is at Lothal on the Gulf of Cambay. In particular the extensive excavations at Kālibangan and Lothal have provided a mass of solid data relating to the Harappan settlements and series of well stratified radio-carbon dates. In 1957 S. R. Rao explored southern Gujarāt and in the light of his discoveries at a number of sites there he proposed a sequence of three stages of “Harappan” and “late Harappan” cultures. These he showed might be related to the sequence revealed by his excavations at Lothal and Rangpur in Saurāṣṭra. Rao's exploration suggested a number of interesting questions.

scholarly journals Evaluasi Ketahanan Sumber Daya Genetik Kedelai terhadap Cekaman Salinitas

2017 ◽  
Vol 1 (3) ◽  
pp. 233
Author(s):  
Pratanti Haksiwi Putri ◽  
Gatut Wahyu Anggoro Susanto ◽  
Abdullah Taufiq
Keyword(s):  
Plant Height ◽  
Salinity Stress ◽  
High Salinity ◽  
Block Design ◽  
Cultural Practice ◽  
Plant Population ◽  
Salinity Level ◽  
Normal Height ◽  
Randomized Block Design ◽  
High Salinity Level

Soybean (Glycine max (L.) Merr.) is sensitive to salinity stress. The availability of soybean cultivar tolerant to salinity stress is the main key of succeeding of soybean cultural practice on saline affected land. Objective of the research was to evaluate the resistance of soybean germplasms to salinity stress. The research was conducted on saline affected soil in Lamongan District during the dry season (May-August) 2016. Nineteen soybean genotypes that were selected from previous salinity test in the green house were reevaluated in the field using a randomized block design with three replications. Wilis cultivar (sensitive to salinity) used as check. Variable observations consisted of soil properties before planting, number of plant grow at 13 and 41 days after sowing (DAS), plant height at 41, 56 and 71 DAS, chlorophyll content index at 27, 41 and 56 DAS, soil EC at 71 DAS, number of harvested plants, yield and yield components. The results showed that among 19 genotypes tested, only five genotypes that survived up to harvest with plant population 30-50% at high salinity level. Salinity reduced plant population more than 50%, and plant height only 50% from its normal height. Based on soil EC, plant population at harvest, and yield, genotype Karat 13, Grayak 3 and Grayak 5 were identified adaptive to high salinity level with soil EC 11,7-14,4 dS/m, while MLGG 0160 were identified adaptive to moderate salinity level with soil EC up to 9,1 dS/m.

scholarly journals Effects of different salinity levels on water quality, growth performance and body composition of Pacific white shrimp (Litopenaeus vannamei Boone, 1931) cultured in a zero water exchange heterotrophic system

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Mohammad Hossein Khanjani ◽  
Moslem Sharifinia ◽  
Saeed Hajirezaee
Keyword(s):  
Water Quality ◽  
Growth Rate ◽  
Body Composition ◽  
Water Exchange ◽  
High Salinity ◽  
Pacific White Shrimp ◽  
Salinity Level ◽  
White Shrimp ◽  
Different Levels ◽  
High Salinity Level

AbstractThe present study was aimed to evaluate the effects of different levels of salinity on water quality, growth performance, survival rate and body composition of Pacific white shrimp in a heterotrophic/biofloc technology (BFT). Shrimp post-larvae with an average weight of 74.46 mg were cultured in 300 L fiberglass tanks containing 130 L water at a density of 1 post-larva/L. Three treatments including different levels of salinity of 8, 21 and 32 ppt with three replicates were considered. The highest levels of body weight, growth rate, specific growth rate, increase in body length and survival rate were observed at high salinity level (32 ppt). The highest feed conversion ratio (FCR) and the lowest level of feed efficiency were obtained in shrimps cultured at lowest salinity level (P<0.05). Biochemical analysis of shrimp body composition showed an increase in protein, lipid and ash content as the salinity elevated (P<0.05). The zero-water exchange system used in this study had no significant effects on water quality parameters. The results of the present study concluded that high salinity level (32 ppt) improves the growth and survival of the biofloc supplemented Pacific white shrimp in a BFT system.

scholarly journals Massive Damage to Coastal Region of Bangladesh by the Cyclone Storm YASS

2021 ◽  
Author(s):  
Aminul Islam ◽  
Mehedi Hasan ◽  
Nahid Ferdous ◽  
Rajib Hossain
Keyword(s):  
Tropical Cyclones ◽  
Storm Surge ◽  
Coastal Region ◽  
Secondary Data ◽  
Western Region ◽  
Cyclone Track ◽  
The South ◽  
Fish Farms ◽  
Geographical Position ◽  
Strong Winds

Background: Tropical cyclones have significant destructive features like strong winds, heavy rainfall, and storms. It happens frequently in Bangladesh because of its geographical position. The southern parts of Bangladesh suffer most, especially the south-western region. Cyclone YASS hit the same parts of the country as cyclone Amphan did in 2020. These areas are still reeling from the effects of the prior tragedies. Methods: Secondary data has used to full fill the objective of the study investigating the damages of cyclone YASS in Bangladesh. Results: Wind and storm surge of the cyclone affected the south-western of Bangladesh. In Patuakhali and Jhalokathi districts, people were mostly affected and houses were mostly damaged in Patuakhali district. Paddy fields were mostly damaged and fish farms in Satkhira district were mostly damaged due their proximity to the cyclone track. Some places have been affected due to the storm surge. Conclusion: Due to the lack of suitable embankments in the coastal region, these areas are flooded by the storm surge. Authorities and government has to take necessary steps to overcome the losses.

scholarly journals Base Flow Index of Way Seputih River at Buyut Udik

2020 ◽  
Vol 1 (2) ◽  
pp. 74
Author(s):  
Dyah Indriana Kusumastuti
Keyword(s):  
Water Conservation ◽  
River Flow ◽  
Dry Season ◽  
Base Flow ◽  
Flow Index ◽  
Discharge Data ◽  
Yearly Average ◽  
Base Flow Index ◽  
Flow Components ◽  
Over Time

One of river flow components considered in watershed management is baseflow, the main contributor to the river flow during dry season. Ratio between baseflow to total flow is called Base Flow Index (BFI). In fact, BFI can be used as an indcator how good the catchment hydrology is. The purpose of this study is to analyze BFI of Way Seputih river at Hydrometry Station Buyut Udik. The method includes Recursive Digital Filter (RDF) method, which utilizes constant recession of hydrographs in displaying the ratio of baseflow from continuous discharge during periods when there is no direct runoff. Daily discharge data from Way Seputih river at Buyut Udik recorded from 1973 to 2006 is used. The result shows that yearly BFI values range from 0.142 to 0.487 and there is a decrease trend of yearly BFI over time. This result is confirmed by yearly average discharges which tend to decrease over time. These are effected by land cover degradation in Way Seputih catchment and  this should be a concern for authorities to improve land and water conservation in Way Seputih catchment so that river flow could be maintained throughout the year. Keywords: base flow index, baseflow, dry season 

scholarly journals Serological evidence of Rift Valley fever virus infection among domestic ruminant herds in Uganda

2021 ◽  
Vol 17 (1) ◽  
Author(s):  
Deo B. Ndumu ◽  
Barnabas Bakamutumaho ◽  
Edward Miller ◽  
Jesca Nakayima ◽  
Robert Downing ◽  
...  
Keyword(s):  
Rift Valley ◽  
Rift Valley Fever ◽  
Rift Valley Fever Virus ◽  
Northern Region ◽  
Western Region ◽  
Domestic Ruminant ◽  
The South ◽  
Valley Fever ◽  
Sheep And Goats ◽  
The Western Region

Abstract Background Prior to the first recorded outbreak of Rift Valley fever (RVF) in Uganda, in March 2016, earlier studies done until the 1970’s indicated the presence of the RVF virus (RVFV) in the country, without any recorded outbreaks in either man or animals. While severe outbreaks of RVF occurred in the neighboring countries, none were reported in Uganda despite forecasts that placed some parts of Uganda at similar risk. The Ministry of Agriculture, Animal Industry and Fisheries (MAAIF) undertook studies to determine the RVF sero-prevalence in risk prone areas. Three datasets from cattle sheep and goats were obtained; one from retrospective samples collected in 2010–2011 from the northern region; the second from the western region in 2013 while the third was from a cross-sectional survey done in 2016 in the south-western region. Laboratory analysis involved the use of the Enzyme Linked Immunosorbent Assays (ELISA). Data were subjected to descriptive statistical analyses, including non-parametric chi-square tests for comparisons between districts and species in the regions. Results During the Yellow Fever outbreak investigation of 2010–2011 in the northern region, a total sero-prevalence of 6.7% was obtained for anti RVFV reacting antibodies (IgG and IgM) among the domestic ruminant population. The 2013 sero-survey in the western region showed a prevalence of 18.6% in cattle and 2.3% in small ruminants. The 2016 sero-survey in the districts of Kabale, Kanungu, Kasese, Kisoro and Rubirizi, in the south-western region, had the respective district RVF sero-prevalence of 16.0, 2.1, 0.8, 15.1and 2.7% among the domestic ruminants combined for this region; bovines exhibited the highest cumulative sero-prevalence of 15.2%, compared to 5.3 and 4.0% respectively for sheep and goats per species for the region. Conclusions The absence of apparent outbreaks in Uganda, despite neighboring enzootic areas, having minimal restrictions to the exchange of livestock and their products across borders, suggest an unexpected RVF activity in the study areas that needs to be unraveled. Therefore, more in-depth studies are planned to mitigate the risk of an overt RVF outbreak in humans and animals as has occurred in neighboring countries.

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