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by
M.A. Hashem |
Total Records (
6 ) for
M.A. Hashem |
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M.M. Hossain
,
M.A. Sattar
,
M.A. Hashem
and
M.R. Islam
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A study was undertaken to determine the arsenic status of some selected soils in six thanas
of three arsenic affected districts of Bangladesh. Eighteen soil samples taking three from
each of 6 thanas representing 3 districts viz. Moulavibazar, Habiganj and Sylhet of
Bangladesh were collected for the study. The soils were collected from 3 depths viz. 0-15,
15-30 and 30-45 cm from each location. The arsenic content in soils of Moulavibazar,
Habiganj and Sylhet districts ranged from 1.32-31.89, 0-16.87 and 0.66-17.57 ppm,
respectively. Out of 18 samples, arsenic content was noticed for 11 samples at 0-15 cm
depth (1.98-25.76 ppm), 15 samples at 15-30 cm depth (3.96-30.68 ppm) and 14 samples
at 30-45 cm depth (3.96-38.23 ppm). The highest arsenic content of 38.23 ppm was found
at 30-45 cm depth in Sylhet district. Seven samples at 0-15 cm, 3 samples at 15-30 cm
and 4 samples at 30-45 cm were free from arsenic contamination. Correlation study of
arsenic contents of soils was done with some soil properties viz. sand, silt and clay
contents, soil pH, EC and organic matter status. Results showed that arsenic content
correlated significantly with different soil properties. |
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M.A.K. Azad
,
M.A. Hashem
and
M.M. Hossain
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Study was conducted to gain a better understanding on the impact of tiger attacks on people by tigers from the Sundarbans as well as different zoo in Bangladesh. From the study it was observed that the highest number of tiger attacks occurred in Shatkhira and lowest in Khulna range, the largest concentration (94%) of attacks took place between 10-12 AM and least (10%) at 9 PM to 3 AM as well as it is clear that people in the age group 15-29 are the least vulnerable, while people that are 60 or over are much vulnerable to tiger attacks, where as Mawalis are the most (51%) as well as Bawalis are the second most (20%) vulnerable to tiger attacks. From the study it also appears that 52% of the victim’s are attacked during collecting fuel wood, timber or other raw materials and around 20% of the victim’s are found during fishing, among them 68% of the victim’s suffered from their decrease income and expenditure and around 28% of the victim’s suffered from stopping their income source. From the study it is concluded that an awareness campaign and motivation is needed as well as diversified income stability to create for the victim’s in the Sundarbans. |
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M.A. Aziz
and
M.A. Hashem
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An experiment was carried out in the saline soil of Satkhira during the aman season of 2000 in order to test the effectiveness of the cyanobacterial inoculum on soil fertility. The modern rice variety BRRldhan 31 was used as the test crop. There were six treatments for the experiment viz. T1 (control), T2 (Recommended Fertilizer Dose), T3 (R-FD-20%N), T4 (RFD-2O%N+Cyanobacteria), T5 (RFD-40%N) and T6 (RFD-40%N+Cyanobacteria). Eight cyanobacterial strains were isolated, identified and brought under pure unicyanobacterial cultures from the selected location. Cyanobacterial inoculum was applied @ 20
kg ha-1 in two equal splits-7 and 30 days after transplanting. Results of field trials indicated that cyanobacterial inoculum could supplement up to 20% nitrogen for rice cultivation in saline soils. Inoculation of the cyanobacterial inoculum in the saline soil resulted in an increase in organic matter, total N and available P status of the soil. Among the parameters, increase in organic matter and total N were statistically significant. Results of the experiments clearly indicated that cyanobacterial inoculum might be used effectively for improving soil fertility of saline soil. |
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U.A. Naher
,
M.A. Hashem
,
M.K. Uddin
,
M. Ahmed
and
M.A. Saleque
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A study was undertaken to determine the oxidizable organic carbon mineralization rate of cowdung
(CD) and poultry manure (PM) alone and with combination of rice straw (RS) and lime under covered condition.
The oxidizable organic carbon mineralization rate followed the first order kinetics and was best in logarithmic
model of (Co-Ct) vs. t. The carbon mineralization rate was higher in the PM than CD. The application of rice
straw reduced mean mineralization rate of both CD and PM and it increased by liming. The cumulative carbon
dioxide evolution flux was higher in CD (854 mg kg-1) followed by CD + RS (828 mg kg-1) and CD + lime
1 1
treatments (780 mg kg-1). The carbon dioxide evolution rate was high up to 20 days in the CD and CD + lime
1
treatments and in the PM it was high up to 30 days. The cumulative carbon dioxide evolution rate was higher
in CD treatments than PM treatments. The mineralization rate became steady after 45 days in CD and 60 days
in PM treatment so within this period it is mature enough for field application. The addition of lime increased
half-life of cowdung and poultry manure. The lowest half- life (19 days) obtained from PM + lime treatment. |
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M.A. Aziz
and
M.A. Hashem
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An experiment was carried out in the saline soil of Satkhira during the aman season of 2000 in order to test the effectiveness of the cyanobacterial inoculum on yield of rice. The modern rice variety BRRIdhan 31 was used as the test crop. There were six treatments for the experiment viz. T1 (control), T2 (Recommended Fertilizer Dose), T3 (RFD-20%N), T4 (RFD-20%N+Cyanobacteria), T5 (RFD-40%N) and T6 (RFD-40%N+Cyanobacteria). Eight cyanobacterial strains were isolated, identified and brought under pure unicyanobacterial cultures from the selected location. Cyanobacterial inoculum was applied @ 20 kg ha-1 in two equal splits-7 and 30 days after transplanting. Results of field trials indicated that cyanobacterial inoculum could supplement up to 20% nitrogen for rice cultivation in saline soils. Inoculation of the cyanobacterial inoculum in the saline soil resulted 80.48% increase in yield over control. |
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U.A. Naher
,
M.A. Hashem
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B.K. Mitra
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M.K. Uddin
and
M.A. Saleque
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A pot study was conducted at greenhouse to measure the P and K mineralization rate from fulvic acid with fresh poultry manure, partially decomposed cowdung, rice straw and lime under covered and uncovered condition. The decomposition period was 90 days. Initially the cowdung contain 127 ppm of fulvic acid P and 2.23 meq /100 g of fulvic acid K whereas the poultry manure contain 378 ppm of fulvic acid P and 13.4 meq /100 g of fulvic acid K. The P and K immobilization takes place after 15 days of decomposition and with the passing of time it increased gradually. The lime addition increased P concentration in cowdung treatments and the highest of 1505 ppm of fulvic acid P was recorded at 75 days of decomposition in the covered cowdung + lime treatment. The addition of rice straw increased K concentration in both cowdung and poultry manure treatments but it decreased the mineralization rate. The highest of 67 meq /100 g of fulvic acid K was mineralized at 75 days of decomposition in the uncovered poultry manure + rice straw treatment. The fulvic acid P mineralization was higher in the covered cowdung and poultry manure treatments. The fulvic acid K mineralization was also high in the covered cowdung treatments but in the poultry manure treatments it was higher in the uncovered treatments. |
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