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Mandal, A.
- Soil Degradation Effect on Soil Productivity, Carbon Pools and Soil Enzyme Activity
Abstract Views :273 |
PDF Views:90
Authors
Narendra K. Lenka
1,
S. P. Jaiswal
1,
J. K. Thakur
1,
S. Lenka
1,
A. Mandal
1,
A. K. Dwivedi
2,
B. L. Lakaria
1,
A. K. Biswas
1,
A. K. Shukla
1,
D. S. Yashona
1
Affiliations
1 Indian Institute of Soil Science, Nabibagh, Bhopal 462 038, IN
2 Jawaharlal Nehru Krishi Viswa Vidyalaya, Jabalpur 482 004, IN
1 Indian Institute of Soil Science, Nabibagh, Bhopal 462 038, IN
2 Jawaharlal Nehru Krishi Viswa Vidyalaya, Jabalpur 482 004, IN
Source
Current Science, Vol 112, No 12 (2017), Pagination: 2434-2439Abstract
Land degradation is one of the major causes of decline in soil productivity. However, the quantitative relationship between degradation and productivity is not fully understood in soils of India. Thus, an experiment was conducted under a range of native soil organic carbon (SOC) levels in two soil types (Inceptisol and Alfisol) of subtropical India. The SOC content under the treatments was 1.61%, 1.01% and 0.77% in Inceptisol and 0.36%, 0.25% and 0.21% in Alfisol under C1 (undepleted soil), C2 (low depletion) and C3 (medium depletion) treatments respectively. Soybean was grown under each SOC level, with four management practices, viz. (1) control, (2) recommended dose of fertilizers (RDF) + 10 Mg farmyard manure (FYM) ha-1, (3) 20 Mg FYM ha-1 and (4) 150% RDF, in three replicates in a factorial completely randomized design. Results indicated significant and positive effect of both SOC and management treatment on plant biomass yield, labile (KMnO4 oxidizable) carbon, soil microbial biomass carbon (SMBC), dehydrogenase activity, soil bulk density (BD) and penetration resistance (PR). The plant biomass reduced by 45% and 29% under C3 (compared to C1) in Inceptisol and Alfisol respectively. The effect of SOC depletion was conspicuous in Inceptisol. The labile C reduced by 47% and 16% under C3 in Inceptisol and Alfisol respectively. SMBC showed a corresponding decrease of 33% and 29%. The soil physical properties, viz. BD and PR showed conspicuous effect of SOC depletion. PR increased by 324% and 75% for Inceptisol and Alfisol respectively.Keywords
Labile Carbon, Soil Degradation and Productivity, Soil Microbial Biomass, Soil Physical Properties.Full Text
References
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- Lenka, N. K., Choudhury, P. R., Sudhishri, S., Dass, A. and Patnaik, U. S., Soil aggregation, carbon build up and ischolar_main zone soil moisture in degraded sloping lands under selected agroforestry based rehabilitation systems in eastern India. Agric. Ecosyst. Environ., 2012, 150, 54–62.
- Geological and Geotechnical Approach for Excavation of Large Unlined Rock Cavern
Abstract Views :260 |
PDF Views:81
Authors
Affiliations
1 Department of Civil Engineering, Visvesvaraya National Institute of Technology, Nagpur - 440 010, IN
2 Sub-Surface Project Division, 2nd Floor, EIB Engineers India Limited, New Delhi 110 066, IN
1 Department of Civil Engineering, Visvesvaraya National Institute of Technology, Nagpur - 440 010, IN
2 Sub-Surface Project Division, 2nd Floor, EIB Engineers India Limited, New Delhi 110 066, IN
Source
Current Science, Vol 115, No 4 (2018), Pagination: 638-643Abstract
The degree of uncertainty involved in an underground storage project is relatively higher compared to other underground projects. In order to allow for a safe and economical construction of underground rock caverns, continuous updating of the geological and geotechnical model along with adjustment in construction approach is required. Investigations planned during different stages of excavation of the project assist in the identification of various geological features and ground characteristics to ensure robust design of underground structures. Investigation in each stage of the project is planned in line with the time and money available at that stage, along with level of detailing required for different design stages. In order to develop an efficient investigation scheme, it is necessary to assimilate the existing information from one stage before planning for the next stage of investigations. This article highlights the significance of various investigations carried out for one of the strategic storage site in the southern part of India.Keywords
Geotechnical and Geological Investigations, Cavern, Tunnelling, Underground Excavations, Rock.Full Text
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