Open Access Original Research Article

Isolation and Screening of Quorum Quenching Rhizobacterial Isolates from the Experimental Farms of Gandhi krishi vigyana Kendra, Bengaluru, Karnataka, India

J. Saranya Packialakshmi, K. Tamilvendan, N. Earanna, B. C. Mallesha

Current Journal of Applied Science and Technology, Page 1-11
DOI: 10.9734/cjast/2021/v40i3731581

A group of synergistic bacteria that nestles on the root surface and provide a benefitting response to the plants are the rhizobacteria. The rhizobacteria benefit the plants by promoting growth and acts as biocontrol agents. Antibiosis, competition, synthesis of cell wall degrading enzymes, and eliciting induced systemic resistance are the mechanisms of biocontrol exhibited by rhizobacteria. Quorum quenching (QQ) is a new mechanism of biocontrol of pathogens whose virulence is induced by population density dependant chemical signaling. Efficient quorum quenching rhizobacteria isolated from the crop rhizospheres can be used as potential inoculums to control phytopathogens. Soft rot is one pernicious plant and storage disease affecting almost all vegetable crops. Hence, the present study was conducted to isolate rhizobacteria from the rhizospheres of six crops Rice (Oryza sativa), Maize (Zea mays), Finger millet (Eleusine coracana), Dolichos Bean (Lablab purpureus), Amaranthus (Amaranthus viridis), Field bean (Vicia faba) from the environs of GKVK. A total number of 96 rhizobacterial cultures were isolated from experimental fields of GKVK. The isolated cultures were screened for their quorum quenching ability by soft agar overlay assay and twenty-four out of ninety-six cultures were affirmative quorum quenchers. Proportionately, 25% of the total rhizobacterial isolates were quorum quenchers. The isolates were characterized morphologically and biochemically and a discussion of the obtained results are deliberately discussed.

Open Access Original Research Article

Geospatial Technology Based Water Management Action Plan for South Forest Division of Nilgiris, Tamil Nadu

S. Manivannan, Balaji Kannan, O. P. S. Khola, V. Kasthuri Thilagam

Current Journal of Applied Science and Technology, Page 12-25
DOI: 10.9734/cjast/2021/v40i3731582

Aims: Recent climate change impacts rainfall patterns, increasing wildlife and livestock populations in higher densities, which are likely to aggravate water scarcity in forest areas. A sustainable water management strategy and action plan based on scientific inputs are crucial and need of the hour to resolve the water scarcity problem. Hence, the study aims to prepare an action plan and water management strategy for rangelands of Nilgiris using geospatial tools. 

Study Design: Field survey was conducted to identify the existing water storage structures and  water requirement and ASTER GDEM and GIS were used to prepare the water management strategies for Nilgiris south forest division.

Place and Duration of the Study: The study was carried out in Nilgiris south division located in between 760 28' 08’’and 760 44' 08" East longitude and 110 10' 81’’and 110 31' 80" North latitude during 2014-2016.

Methodology: The study area has been delineated as macro watersheds, and the altitude, slope, forest cover and drainage lines were extracted from ASTER GDEM for generation thematic maps. Rainfall data for twenty years (1995-2014) was collected and runoff was worked out using runoff coefficient of a different land. A field survey was conducted for identifying the existing water storage structures, spatial occupancy of herbivores, spread and water requirement of invasive species in the Nilgiris south forest division.

Results: GIS based thematic maps for slope, contour, area coverage under forest range and macro watershed have been prepared, and water availability and water balance components like runoff and evapotranspiration have been determined. After identifying water availability and water balance according to the site conditions and strategies one Earthen cum masonry embankment, 2 Earthen pond with Major check dam, 2 Masonry embankments, 2 Major check dam 7 Medium check dam 100 Minor check dam, 1 RCC Embankment and 99 gabion check dams in South forest division of Nilgiris.

Conclusion: Suitable locations were identified and location specific water harvesting structures have been suggested to store 68844 cum of water.

Open Access Original Research Article

Adsorption Study of Soluos Dumpsite Leachate Treatment Using Musa sapientum Peels as Biosorbent

L. Salami, D. O. Olumuyiwa, E. A. Alfred, O. S. Olakanmi

Current Journal of Applied Science and Technology, Page 26-35
DOI: 10.9734/cjast/2021/v40i3731583

Dumpsite leachate has the potential to pollute ground and surface water as well as vegetation within the vicinity of the dumpsite.  Its treatment therefore needs adequate attention. The aim of this work is to study the adsorption of Soluos dumpsite leachate treatment using Musa sapientum peel as biosorbent with a view of establishing the adsorption isotherm model. Musa sapientum peels sourced from Ayetoro market in Epe area of Lagos State, Nigeria were used to prepare the adsorbent. Batch adsorption was carried out with various dosage of the prepared absorbent in leachate collected from Soluos dumpsite in Lagos. The adsorption data obtained were fitted into Linear, Freundlich, Langmuir, Temkin and Hasley isotherm models. The results showed that the concentration of total dissolved solids (TDS) in the dumpsite leachate decreased as the adsorbent dosage increased. At adsorbent dosage of 10 g/L, the concentration of TDS in the leachate was 485.7 mg/L which was less than the 500 mg/L stipulated by National Environmental Standard and Regulatory Agency (NAESRA) for the discharge of wastewater. The coefficient of determination (R2) values for Linear, Freundlich and Hasley, Langmuir and Temkin isotherm models were 0.9944, 0.9936, 0.8562 and 0.9723 respectively. Linear isotherm model was jettisoned because the plot did not pass through the origin and Freundlich isotherm model was ignored as a result of N value which was less than unity hence Hasley isotherm model was adopted in this work. A good correlation existed between the experimental and predicted values, having a R2 value of 0.9965 which further validated the Hasley isotherm model as the best adsorption model for the treatment of Soluos dumpsite leachate using Musa sapientum peel as biosorbent. It was concluded that Musa sapientum peel as biosorbent can be used for treatment of Soluos dumpsite leachate.

Open Access Original Research Article

Geospatial Effect on the Mining Operation in Joda/Barbil Area of Odisha, India

Siba Prasad Mishra, Kamal Kumar Barik, Smruti Ranjan Panda

Current Journal of Applied Science and Technology, Page 36-55
DOI: 10.9734/cjast/2021/v40i3731584

The study aims to investigate the Geospatial effect on the extraction operation in Joda and Barbil mining areas of Keonjhar district, Odisha, India. Present work involves the topography, soil, climate, and stratigraphy investigation of the area. The acquisition of Landsat 8 TIRS (Thermal Infrared), Landsat 5 TM (Thematic Mapper), and CARTOSAT DEM data of temporal and spatial satellite images from various websites. ARC GIS and ERDAS IMAGINE 9.2 software used to find the land use and land cover images (accuracy average 90%). Normalized Difference Vegetation Index (NDVI), and Surface air Temperature (SAT) of Barbil area for 2003, 2007, 2017 and 2018 have been estimated. Comparison of the results have shown that, there is increase in built up, and mining areas whereas the agricultural land and vegetation cover are down scaled. There is constant average SAT rise of 1-2°C in all the land cover classification between 2007 and 2018. The NDVI values show conversion of sparse from dense vegetation in the area. Poor operational strategies in mines operation, like corruption, illegal mining, lack of accountability, overburden wastes/ trailing disposal, ecologic degradation, waterlogging in mine pits, and human rights violations are the root causes of environmental deterioration of the study area. It is pertinent to implement strictly, the Mines and Minerals (Development and Regulation) Amendment Act, India, 2021, regular GIS application to assess the mines volume of extraction, strict vigilance and fixation of accountability for losses of existing mines values, and afforestation/ reforestation of degraded/lost forests in Barbil area.

Open Access Review Article

Thematizing Marriage in Ama Ata Aidoo’s Changes and Chimamanda Ngozi Adichie’s Purple hibiscus: The Dynamics of Modern African Marriage Relationship

Andrew Kwame Yankyerah

Current Journal of Applied Science and Technology, Page 56-64
DOI: 10.9734/cjast/2021/v40i3731585

The task of this paper is to highlight some of the marriage relationship tendencies that have changed in the modern African Marriage, in relation to the traditional norms, as manifest in two texts of two African Feminist writers. The study thus examines how Ama Ata Aidoo’s Changes and Chimamanda N. Adichie’s Purple Hibiscus explore the marriage institution in Africa and unearth the changing dynamics in it, as it pertains to the modern or post-modern African society. The study concluded that though the dignity of marriage coupled with its necessity as a social institution is unquestionably maintained in our focused African texts, its dynamics, in modern society, must yield to positive change, at least, to reflect the emerging socio-economic trends in African society today.