| dc.contributor.advisor | Professor Dr. Musharraf Hossain Mian | |
| dc.contributor.author | ASADUZZAMAN, MOHAMMAD | |
| dc.date.accessioned | 2022-04-18T08:02:54Z | |
| dc.date.available | 2022-04-18T08:02:54Z | |
| dc.date.issued | 2005-09 | |
| dc.identifier.uri | http://localhost:8080/xmlui/handle/123456789/143 | |
| dc.description | Crop productivity of the salt affected saline areas in the coastal region differs
considerably from that of non-saline areas. Because of salinity, a special
environmental and hydrological condition exists, that restricts the normal crop
production throughout the year. The coastal saline area includes parts of Ganges
floodplain, Ganges tidal floodplain and Young Meghna estuarine floodplain.
Oflatc, with the changing degree of salinity of some areas and expansion of salt
affected area due to further intrusion of saline water, normal crop production has
become more risky. In Bangladesh, over 30 percent of the net cultivable area is in
the coastal region. Out of 2.85 million hectares of the coastal and off-shore areas,
about 0.83 million hectares of the arable lands which constitutes about 52.8 percent
of the net cultivable area in 64 upazilas of 13 districts, is affected by varying degrees
of soil salinity (Karim et al., 1990). Agricultural land use in these areas is very poor,
which is much lower than the country’s average cropping intensity. Possibility of
increasing cropping intensity in this area depends on identification of the factors
responsible for low cropping intensity and taking appropriate steps for improving
the determining factors. | en_US |
| dc.description.abstract | Laboratory and field experiments have been conducted during 2000-2001 to assess the role
of Cyanobacteria for maintaining rice productivity, improving soil fertility and reclaiming
soil salinity. Saline soils from two saline areas viz. Fultala village of Batiaghata upazila
under Khulna district and Mahmudpur village of Shaymnagar paz under Satkhira
district were selected for the study. The experiments were conducted in two phases. Firstly,
soil samples were collected from two sites and microbiological study was done for isolation
and identification of Cyanobacteria, and measuring their N-fixing capacity. Fifteen taxa of
Cyanobacteria taking seven from Fultala and eight from Mahmudpur sites were isolated,
identified and brought under pure unialgal cultures. Out of 15, six isolates of Cyanobacteria
three from Fultala viz. Sccytonema, Oscillatoria, Fischerella, and three from Mahmudpur
viz. Anabaena, Scytonema and: Westiellopsis were found promising in respect to fast
growth and N fixation capacity at high salinity. BGA inoculum was prepared through
composite cultures of these six isolates for field experiments. Secondly, two identical
field trials were conducted at both sites to observe the effect of Cyanobacteria on the
productivity of rice, soil fertility and soil salinity for two consecutive years (2000 and
2001). The six treatment combinations used for the experiment were — Control,
Recommended Fertilizer Dose (RFD) i.e. NgoP22K33Ss, NgoP22K33Ss — 20%N,
NgoP22K33Ss — 20%N+ Cyanobacteria, NgoP22K33Ss — 40%N and NgoP22K33Ss — 40% N +
Cyanobacteria. The experiment was laid out in randomized complete block design with
three replicaiions. The modern rice varieties BRRI dhan28 and BRRI dhan31 were used
as test crops during boro and T.aman seasons, respectively. Results of the present
investigation demonstrated that RFD — 20%N+ Cyanobacteria treatment significantly
enhanced rice yield and productivity in saline soils, and maintained the highest yield
and productivity throughout the experimentation. Application of Cyanobacteria inoculum
in saline soils resulted slightly increased in organic matter, total nitrogen, available
phosphorus, available sulphur and exchangeable potassium contents in soils while
resulting in a decrease in pH and electrical conductivity (EC). Results of the present
investigation indicated that Cyanobacteria inoculum might be used for maintaining rice
productivity, improving soil fertility and reclaiming soil salinity. | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR. | en_US |
| dc.subject | MATERIALS AND METHODS | en_US |
| dc.subject | REVIEW OF LITERATURE | en_US |
| dc.title | SOIL SALINITY AND RICE PRODUCTIVITY MANAGEMENT WITH SPECIAL REFERENCE TO CYANOBACTERIA | en_US |
| dc.type | Thesis | en_US |
