Transformations and bioavailability of chromium in tannery sludge-contaminated soils

Leather tanning is regarded as one of the most profitable industries in India but also one of the major sources of pollution, particularly in the State of Tamil Nadu, where more than 70% of the tannery industry is located. The resulting sludge waste is currently being disposed onto land around the tanneries, resulting in extensive contamination especially chromium used in the tanning process. The work described in this thesis aims to find a potentially locally usable method to reduce the toxic CR and bioavailable Cr fractions viz. water soluble and exchangeable-Cr in the sludge-contaminated soil through addition of organic wastes.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Transformations and bioavailability of chromium in tannery sludge-contaminated soils

Leather tanning is regarded as one of the most profitable industries in India but also one of the major sources of pollution, particularly in the State of Tamil Nadu, where more than 70% of the tannery industry is located. The resulting sludge waste is currently being disposed onto land around the tanneries, resulting in extensive contamination especially chromium used in the tanning process. The work described in this thesis aims to find a potentially locally usable method to reduce the toxic CR and bioavailable Cr fractions viz. water soluble and exchangeable-Cr in the sludge-contaminated soil through addition of organic wastes.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

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Not AvailableA field experiment was conducted to investigate the soil microbial growth and enzymatic activity of TreatedDistillery Effluent (TDE) and Bio-compost (BC) applied in Vertisols having clay loam texture grown with Maize crop (Zea mays). Under split plot design with five main and sub plots with addition of organics viz., No organics; application of TDE @ 0.5 lakh litres ha-1 ; TDE @ 1.0 lakh litres ha-1 ; BC@ 5 t ha and FYM @ 12.5 t ha + biofertilizers. subplot treatments viz., addition of inorganic fertilizers at different levels of recommended dose of NP fertilizers (0 %, 50 %, 75 % and 100 %) compared with 100% recommended dose of NPK @ 150 : 75: 75 of kg N, P2 ,O5 and K2O ha-1 . Application of TDE 1.0 lakh litres ha resulted higher bacterial, fungal and actinomycetes population over control at all stages. The soil enzyme activities as phosphatase, dehydrogenase andurease recorded the highest values with the application of TDE @ 1.0 lakh litres ha-1 over control. The soilmicrobial population and enzyme activities increased with the application of TDE over control. Soil microbialactivity had a direct impact on the plant nutrient availability as well as other favorable properties associated with soil productivity.Not Availabl

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Not AvailableA field experiment was conducted to investigate the soil microbial growth and enzymatic activity of Treated Distillery Effluent (TDE) and Bio-compost (BC) applied in sandy loam soils grown with Maize crop (Zea mays). Under split plot design with five main plots with addition of organics viz., No organics; application of TDE @ 0.5 lakh litres ha-1; TDE @ 1.0 lakh litres ha-1; Bio compost @ 5 t ha-1 and FYM @ 12.5 t ha-1 + biofertilizers. In addition, five subplot treatments viz., addition of inorganic fertilizers at different levels of recommended dose of NP fertilizers (0 %, 50 %, 75 % and 100 %) compared with 100 per cent recommended dose of NPK @ 150 :75: 75 of kg N, P2O5 and K2O ha-1. Application of TDE 1.0 lakh litres ha-1 resulted higher bacterial, fungal and actinomycetes population over control at all stages of crop growth. Indeed, the soil bacterial population recorded the highest value of 20.1 and 19.3 x106 CFU g-1 of soil with the application of TDE @ 1.0 lakh litres ha-1 compared to control at post-harvest stage. There was an increase in the soil fungal population to the tune of 30.3 per cent over control at post-harvest stage. Furthermore, application of TDE @ 1.0 lakh litres ha-1 recorded the highest soil actinomycetes population at all stages of crop growth. The soil enzyme activities as phosphatase, dehydrogenase and urease recorded the highest values of 12.8 μg p-nitrophenol g-1 soil hr-1; 2.96 μg TPF g-1 soil hr-1 and 5.16 μg NH4-N g-1 soil hr-1 respectively with the application of TDE @ 1.0 lakh litres ha-1. The soil microbial population and enzyme activities increased with the application of distillery effluent over control. Hence, it was observed that, Soil microbial activity had a direct impact on the plant nutrient availability as well as other favorable properties associated with soil productivityNot Availabl

Not Available

Not AvailableA field experiment was conducted to investigate the soil microbial growth and enzymatic activity of Treated Distillery Effluent (TDE) and Bio-compost (BC) applied in sandy loam soils grown with Maize crop (Zeamays). Under split plot design with five main plots with addition of organics viz., No organics; application of TDE @ 0.5 lakh litres ha-1TDE @ 1.0 lakh litres ha; Bio compost @ 5 t ha-1 and FYM @ 12.5 t ha +biofertilizers. In addition, five subplot treatments viz., addition of inorganic fertilizers atdifferent levels of recommended dose of NP fertilizers (0 %, 50 %, 75 % and 100 %) compared with 100 per cent recommended dose of NPK @ 150 :75: 75 of kg N, P andK2O ha-1. Application of TDE 1.0 lakh litres ha-1 resulted higher bacterial, fungal and actinomycetes population over control at all stages of crop growth. Indeed, the soil bacterial population recorded the highest value of 20.1 and 19.3 x106 of soilwith the application of TDE @ 1.0 lakh litres ha-1 compared to control at post-harvest stage. There was an increase in the soil fungal population to the tune of 30.3 per cent over control at post-harvest stage. Furthermore, application of TDE @ 1.0 lakh litres ha-1 recorded the highest soil actinomycetes population at all stages of crop growth. The soil enzyme activities as phosphatase, dehydrogenase and urease recorded the highest values of12.8 µg p-nitrophenol g-1 soil hr-1; 2.96 µg TPF g-1 soil hr -1 and 5.16 µg NH4-N g -1 respectively with the application of TDE @ 1.0 lakh litres ha -1 . The soil microbial population and enzyme activities increased with the application of distillery effluent over control. Hence, it was observed that, Soil microbial activity had a direct impact on the plant nutrient availability as well as other favorable properties associated with soil productivity.Not Availabl

Alleviation of Sodic Stress in Rice by Exploring the Exopolysaccharide-Producing Sodic-Tolerant Bacteria

Sodicity is one of the major salt stresses that impair crop production. Exopolysaccharide-producing sodic tolerant bacteria (EPS-STB) play a significant role in reducing the sodic stress in plants by hampering the uptake of sodium. In this context, this study aims to isolate the EPS-STB for alleviating sodic stress in rice under a sodic environment. Thus, artificial sodicity was created in culture media, and 253 bacteria were isolated from the rice rhizosphere of sodic soils in Trichy and Chinna Salem of Tamil Nadu in India. Fifty bacterial isolates were initially screened based on EPS production, sodic tolerant ability, and plant growth-promoting activities. Further, these bacterial isolates were identified using 16S rDNA sequencing. The results suggested that the isolated bacteria possessed biofilm-forming abilities along with plant growth-promoting activities and osmolyte accumulation under sodic stress conditions. Bacillus rugosus L1C7T, Bacillus paralicheniformis L1C5L, Pseudomonas sp. L5C14T and Franconibacter helveticus L2C1L2 were chosen as better EPS-STB plant growth-promoting bacteria, and their impact on rice under sodic conditions was evaluated. Among the sodic tolerant bacteria, Franconibacter helveticus L2C1L2-inoculated rice plants increased dry matter production compared to the control. Thus, this study showed that the utilization of EPS-STB will become a promising tool to alleviate sodic stress in rice