Bharadwaj V, Omanwar PK (1992) Impact of long term fertility treatments on bulk density, water content and microbial population of soil. Journal of the Indian Society of Soil Science 40: 553-555.

Chhonkar PK, Bhadraray S, Patra AK, Purakayastha TJ (2002) Experiments in Soil Biology and Biochemistry. Westville Publishing House, New Delhi, Pp.180.

Cie?lik BM, Namie?nik J,  Konieczka P (2015) Review of sewage sludge management: standards, regulations and analytical methods. Journal of Cleaner Production 90: 1-15.

Duncan DM (1955) Multiple range and multiple F-test. Biometric 11: 1-42.

Jackson ML (1973) Soil Chemical Analysis. Prentice Hall of India Pvt. Ltd., New Delhi.

Jatav HS, Singh SK, Singh YV, Paul A, Kumar V, Singh P, Jayant  H (2016) Effect of biochar on yield and heavy metals uptake in rice grown on soil amended with sewage sludge. Journal of Pure and Applied Microbiology 10: 1367-1377.

Kamlesh K, Mishra MM, Dhankar SS, Kapoor KK, Gupta AP (1991) Effect of long term manurial application on microbial biomass. Journal of the Indian Society of Soil Science 39: 685-688.

Lal R (2016) Global food security and nexus thinking. Journal of Soil and Water Conservation 71: 85A-90A.

Lal R, Follett RF, Stewart BA, Kimble JM (2007) Soil carbon sequestration to mitigate climate change and advance food security. Soil Science 172: 943-956.

Latare AM, Kumar O, Singh SK, Archana G (2014) Direct and residual effect of sewage sludge on yield, heavy metals content and soil fertility under rice-wheat system. Ecological Engineering 69: 17-24.

Latare AM, Singh SK (2013) Effect of sewage sludge and fertilizers application on accumulation of heavy metals and yield of rice (Oryza sativa L.) in an Inceptisol of Varanasi. Journal of the Indian Society of Soil Science 61: 219-225.

Magdoff F, VenEs H (2009) Building soils for better crops sustainable soil management. Sustainable Agriculture Research and Education (3^rd Edition) Pp 310.

Mahajan S, Kanwar SS, Kumari P, Sharma SP (2007) Long term effect of mineral fertilizers and amendments on microbial dynamics in an Alfisol of Klestern Himalayas. Indian Journal of Microbiology 47: 86-89.

Martin JP (1950) Use of acid rose Bengal and Streptomycin in the plate method for estimating soil fungi. Soil Science 69: 215.

Olsen SR, Cole CV, Watanabe FS, Dean LA (1954) Estimation of available phosphorus in soil by extraction with sodium bicarbonate. United State Department of Agriculture Circular 939: 19.

Rajasree G, Piliai GR (2002) Influence of nitrogen nutrition on soil microbial population. Annals of Agricultural Research 23: 331-333.

Selvi D, Santhy P, Dhakshinamoorthy M (2005) Effect of inorganic alone and in combination with farm yard manure on physical properties and productivity of vertic Haplusteps under long-term fertilization. Journal of the Indian Society of Soil Science 53: 302-307.

Sharma U, Subehila SK (2014) Effect of long term integrated nutrient management on rice (Oryza sativa L.)- Wheat (Triticum aestivum L.) productivity and soil properties in North Western Himalayas. Journal of Indian Society of Soil Science 62: 248-254.

Singh SK, Singh RP, Bohra JS, Srivastava JP, Singh SP, Kumar M, Kumar O (2014) Effect of Organic and Inorganic Sources of Nutrients on Heavy Metals Content and Microbial Population in Soil under Rice Cultivation. Environment & Ecology 32: 907-910.

Smith SR (2009) A critical review of the bioavailability and impacts of heavy metals in municipal solid waste compost compared to sewage sludge. Environment International 35: 142-156.

Sparks DL (1996) Methods of soil analysis. Part 3- Chemical Methods. Soil Science Society of America, Inc. American Society of Agronomy, Inc. Madison Wisconsin, USA.

Subbiah B, Asija GL (1956) Alkaline permanganate method of available nitrogen determination. Current Science 25: 259-260.

Thornton HC (1922) On the development of standardized agar medium for counting of soil bacteria with special regard to repression of spreading colonies. Annals of Applied Biology 9: 241.

United Nation (2015) United Nation Department of Economics and Social Welfare, Population Division, Revision of World Population Prospects dated 09/08/2017.

United Nations (2014) Revision of the World Urbanization Prospects. New York: UN Department of Economic and Social Affairs.

Walkley A, Black IA (1934) An examination of Degtjareff method for determining soil organic matter and a proposed modification of the chromic acid titration method. Soil Science 37: 29-37.