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Microbial Biomass Carbon Status in Agro-Ecological Sub Regionsof Black Soils in India

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Title Microbial Biomass Carbon Status in Agro-Ecological Sub Regionsof Black Soils in India
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Creator Kulandaivelu Velmourougane, M. V. Venugopalan, T. Bhattacharyya, Dipak Sarkar, D. K. Pal, Apeksha Sahu, P. Chandran, S. K. Ray, et al.
 
Subject Microbial biomass carbon Bio-climates Cropping systems Land use Management practices
 
Description A study was undertaken in the established benchmark soil series in different agro-ecological sub-regions of Black Soil Regions of India with the objective to assess the urease activity as a function of soil depth, bio-climate, cropping system and land use type. The urease activity declined with increase in soil depth. Maximum activity was restricted within 0–30 cm of soil depth. Cropping systems and bio-climates significantly (p \ 0.01) influenced the urease activity in soil. The average urease activity in different bio-climates was in decreasing order viz. sub-humid (moist) sub-humid (dry) semi-arid (dry) arid. The activity in different cropping systems was in decreasing order viz. legume- sugarcane- cereals- cotton-based cropping system. Higher urease activity was observed in irrigated agro-systems as compared to the rainfed agricultural systems. High management practices increased urease activity as compared to low management. In physical properties, urease activity was negatively correlated with sand, fine clay, bulk density and available water content. Electrical conductivity, calcium carbonate and cation exchange capacity showed negative correlation in chemical properties at all the soil depths.
The present study was undertaken with an objective to study the impact of pedo-edaphic environments,
cropping systems, land use, and management practices on the MBC. Soil samples were collected from seventeen benchmark soils representing different agro-ecological subregions of black soil region of India. The pooled comparisons of MBC in different bio-climates indicated significant differences (p \ 0.001) between the bio-climates. Significantly higher (p \ 0.001)MBCwas recorded in sub-humid dry bioclimate (267 lg g-1) followed by sub-humid moist and least in arid bio-climate (97.5 lg g-1). In cropping systems, legume-based system (205 lg g-1) had higher MBC. The lowest MBC was recorded in cotton-based system (128 lg g-1). In soil sub-groups, Halic Haplusterts showed higher MBC (209 lg g-1) followed by Typic Haplusterts (208 lg g-1), while the lowest MBC was observed in Gypsic Haplusterts (98.5 lg g-1). Significantly higher (p \ 0.05) MBC was recorded in high management and irrigated agro-systems as compared with low management and rainfed agro-systems. The MBC content in the soil is significantly and positively correlated with organic carbon %, total culturable microbial population, nitrogen content,
and available water content.
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Date 2021-02-19T01:29:57Z
2021-02-19T01:29:57Z
2013-08-01
 
Type Research Paper
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/45404
 
Language English
 
Relation Not Available;
 
Publisher Springer, The National Academy of Sciences