Effect of Nutrient Management Regimes on Soil Biological Properties - A Review
L.G. Mawlong
ICAR-Research Complex for NEH Region, Umiam, Meghalaya (793 103), India
B.C. Verma*
Central Rainfed Upland Rice Research Station (CRURRS), ICAR-NRRI, Hazaribagh, Jharkhand (825 301), India
Manoj Kumar
ICAR-Research Complex for Eastern Region, RCM, Darbhanga, Bihar (846 005), India
D. Thakuria
College of Post Graduate Studies, CAU, Umiam, Meghalaya (793 103), India
Rajesh Kumar
ICAR-Research Complex for NEH Region, Umiam, Meghalaya (793 103), India
DOI: https://doi.org/10.54083/ResBio.2.2.2020.65-74
Keywords: Fertilizer, Manures, Microbial biomass, Soil enzymes, Soil organic carbon fractions, Soil quality
Abstract
Soil quality assessment is very important aspect in determining long term sustainability; however it is governed by different physico-chemical and bio-chemical parameters. These are interrelated among them and controlled by different management practices like tillage, water, organic and inorganic source of nutrients etc. Among the different soil parameters, it was considered that soil biochemical parameters provide rapid and accurate estimates on soil quality and its evaluation require understanding of biochemical and microbiological soil properties. Among the several biochemical and microbiological properties, soil organic carbon fractions, microbial biomass and soil enzymes activities may be considered as an important property which governed soil health or quality. Soil organic carbon fractions includes total organic carbon, soil organic carbon (oxidizable carbon), labile carbon etc., microbial biomass and enzymes activities include content of microbial biomass carbon, nitrogen, phosphorus and activities of different enzymes like dehydrogenase, acid and alkaline phosphatase, Urease, β-glucosidase, Aryl sulphatase, etc. It is established and proved that, nutrient management practices (application of fertilizers and manures) marked significant effect on SOC fractions and soil enzymes activities. In most of cases, the application of organic sources of nutrients as well as integrated nutrient management resulted in significant improvement in the soil biochemical properties, however, microbial properties like microbial biomass carbon, nitrogen, phosphorus and enzymes activities are very sensitive to nutrient management options compared to soil organic carbon fractions.
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Acosta-Martínez, V., Tabatabai, M.A., 2000. Enzyme activities in a limed agricultural soil. Biology and Fertility of Soils 3, 85-91.
Acosta-Martínez, V., Cruz, L., Sotomayor-Ramírez, D., Pérez-Alegría, L., 2007. Enzyme activities as affected by soil properties and land use in a tropical watershed. Applied Soil Ecology 35, 35-45.
Allison, S.D., Vitousek, P.M., 2005. Response of extracellular enzymes to simple and complex nutrient inputs. Soil Biology and Biochemistry 37, 937-944.
Andrews, R.K., Blakeley, R.L., Zerner, B., 1989. Urease: A Ni (II) metalloenzyme. In: The Bioinorganic Chemistry of Nickel. (Ed.) Lancaster, J.R. VCH Publishers, New York. pp. 141-166.
Aon, M.A., Colaneri, A.C., 2001. Temporal and spatial evolution of enzymatic activities and physico-chemical properties in an agricultural soil. Applied Soil Ecology 18, 255-270.
Balota, E.L., Auler, P.A.M., 2011. Soil microbial biomass under different management and tillage systems of permanent intercropped cover species in an orange orchard. Revista Brasileira de Ciência do Solo 35, 1873-1883.
Bandick, A.K., Dick, R.P., 1999. Field management effects on soil enzyme activities. Soil Biology and Biochemistry 31, 1471-1479.
Banerjee, B., Aggarwal, P.K., Pathak, H., Singh, A.K., Chaudhary, A., 2006. Dynamics of organic carbon and microbial biomass in alluvial soil with tillage and amendments in rice-wheat systems. Environmental Monitoring and Assessment 119, 173-189.
Basak, B.B., Biswas, D.R., Pal, S., 2013. Soil biochemical properties and grain quality as affected by organic manures and mineral fertilizers in soil under maize-wheat rotation. Agrochem 57(1), 49-66.
Bastia, D.K., Tripathy, S., Barik, T., Kar, C.S., Raha, S. Tripathy, A., 2013. Yield and soil organic carbon sequestration under organic nutrient management in rice-rice system. Journal of Crop and Weed 9(1), 52-55.
Bergstrom, D.W., Monreal, C.M., King, D.J., 1998. Sensitivity of soil enzyme activities to conservation practices. Soil Science Society of America Journal 62, 1286-1295.
Borie, F., Rubio, R., Morales, A., 2008. Arbuscular mycorrhizal fungi and soil aggregation. Journal of Soil Science and Plant Nutrition 8, 9-18.
Bremner, J.M. Mulvaney, R.L., 1978. Urease activity in soils. In: Soil Enzymes. (Ed.) Burns, R.G. Academic Press, London. pp. 149-196.
Brookes, P.C., Ocio, J.A., Wu, J., 1990. The soil microbial biomass: its measurement, properties and role in soil nitrogen and carbon dynamics following substrate incorporation. Soil Microorganisms 35, 39-51.
Burket, J.Z., Dick, R.P., 1998, Microbial and soil parameters in relation to N mineralization in soils of diverse genesis under differing management systems. Biology and Fertility of Soils 27, 430-438.
Burns, R.G., 1982. Enzyme activity in soil: location and possible role in microbial ecology. Soil Biology & Biochemistry 14, 423-427.
Burns, R.G., 1986. Interaction of enzymes with soil mineral and organic colloids. In: Interactions of Soil Minerals with Natural Organics and Microbes. (Eds.) Huang, P.M. and Schnitzer, M. Soil Science Society of America, Madison. pp. 429-452.
Byrnes, B.H., Amberger, A., 1989. Fate of broadcast urea in a flooded soil when treated with N-(n-butyl)thiophospheric triamide, a urease inhibitor. Fertility Science and Research 18, 221-231.
Černý, J., Balík, J., Pavlíková, D., Zitková, M., Sýkora, K., 2003. The influence of organic and mineral nitrogen fertilizers on microbial biomass nitrogen and extractable organic nitrogen in long-term experiments with maize. Plant, Soil and Environment 49(12), 560-564.
Chen, G.C., He, Z.L., Huang, C.Y., 2000. Microbial biomass phosphorus and its significance in predicting phosphorus availability in red soils. Communications in Soil Science and Plant Analysis 31, 655-667.
Conte, E., Anghinoni, I., Rheinheimer, D.S., 2002. Fósforoda biomassa microbiana e atividade de fosfatase ácidaapós aplicação de fosfato em solo no sistema plantio direto. Revista Brasileira de Ciencia do Solo 26, 925-930.
Coote, M.R., Ramsey, J.F., 1983. Quantification of the effects of over 35 years of intensive cultivation of four soils. Canadian Journal of Soil Science 63, 1-14.
Dalal, R.C., 1982. Effect of plant growth and addition of plant residues on the phosphatase activity in soil. Plant and Soil 66, 265-269.
Dick, R.P., 1992. A review: Long-term effects of agricultural systems on soil biochemical and microbial parameters. Agriculture, Ecosystems & Environment 40(1-4), 25-36.
Dick, R.P., 1997. Soil enzyme activities as integrative indicators of soil health. In: Biological Indicators of Soil Health. (Eds.) Pankhurst, C.E., Doube, B.M. and Gupta, V.V.S.R. CAB International, Wallingford. pp. 121-156.
Dinesh, R., Chaudhuri, S.G., Ganeshamurthy, A.N., Pramanik, S.C., 2004. Biochemical properties of soils of undisturbed and disturbed mangrove forests of South Andaman (India). Wetlands Ecology and Management 12(5), 309-320.
Dodgson, K.S., Rose, F.A., 1976. Sulfohydrolases. In: Metabolism of Sulfur Compounds, Volume 7. (Ed.) Greenberg, D.M. Metabolic Pathways. Academic Press, London. pp. 359-431.
Dodgson, K.S., White, G., Fitzgerald, J.W., 1982. Sulphatase Enzyme of Microbial Origin, Volume I. CRC Press, Florida.
Dodor, D.E., Tabatabai, M.A., 2003. Effect of cropping systems on phosphatases in soils. Journal Plant Nutrition and Soil Science 166, 7-13.
Eivazi, F., Bayan, M.R., Schmidt, K., 2003. Select soil enzyme activities in the historic Sanborn Field as affected by long-term cropping systems. Communications in Soil Science and Plant Analysis 34, 2259-2275.
Esen, A., 1993. β-glucosidases: overview. In: β-glucosidases and Molecular Biology. (Ed.) Esen, A. American Chemical Society, Washington, DC. pp. 9-17.
Fitzgeraid, J.W., Stickland, T.C., 1987. Mineralization of organic sulphur in the O-horizon of a hardwood forest: Involvement of sulphatase enzyme. Soil Biology and Biochemistry 19, 779-781.
Fitzgerald, J.W., 1976. Sulphate ester formation and hydrolysis: a potentially important yet often ignored aspect of the sulphur cycle of aerobic soils. Bacteriology Reverend 40, 628-721.
Ganeshamurthy, A.M., Singh, G., Singh, N.T., 1995. Sulphur status and response of rice to sulphur on some soils of Andaman and Nicobar Islands. Journal of Indian Society Soil Science 43, 637-641.
Garcia-Ruiz, R., Ochoa, V., Hinojosa, M.B., Carreira, J.A., 2008. Suitability of enzyme activities for the monitoring of soil quality improvement in organic agricultural systems. Soil Biology and Biochemistry 40, 2137-2145.
George, T.S., Turner, B.L., Gregory, P.J., Cade-Menun, B.J., Richardson, A.E., 2006. Depletion of organic phosphorus from Oxisols in relation to phosphatase activities in the rhizosphere. European Journal of Soil Science 57, 47-57.
Ghosh, S., Wilson, B.R., Mandal, B., Ghoshal, S.K., Growns, I., 2010. Changes in soil organic carbon pool in three long-term fertility experiments with different cropping systems and inorganic and organic soil amendments in the eastern cereal belt of India. Australian Journal of Soil Research 48, 413-420.
Gianfreda, L., Bollag, J.M., 1996. Influence of natural and anthropogenic factors on enzyme activity in soil. In: Soil Biochemistry, Volume 9. (Eds.) Stotzky, G. and Bollag, J.M. Dekker, New York. pp. 123-194.
Gil-Sotres, F., Trasar-Cepeda, C., Leirós, M.C., Seoane, S., 2005. Different approaches to evaluating soil quality using biochemical properties. Agriculture, Ecosystems & Environment 37, 877-887.
Gupta, V.V.S.R., Farrell, R.E., Germida, J.J., 1993. Activity of arylsuphatases in Saskatchewan soils. Canadian Journal of Soil Science 73, 341-347.
Hazarika, S., Parkinson, R., 2011. Hot water extractable soil carbohydrate - A sensitive measurement for determining the impact of long- term tillage and residue management. Journal of the Indian Society of Soil Science 59(1), 60-66.
Jastrow, J.D., Miller, R.M., 1997. Soil Processes and the Carbon Cycle. CRC Press, Boca Raton, FL. pp. 207-223.
Jenkin, D.S., 1977. The soil biomass. NZ Soil News 25, 213-218.
Joner, E.J., 2000. The effect of long-term fertilization with organic or inorganic fertilizers on mycorrhiza-mediated phosphorus uptake in subterranean clover. Biology and Fertility of Soils 32, 425-440.
Jordan, D., Kremer, R.J., 1994. Potential use of microbial activity as an indicator of soil quality. In: Soil Biota: Management in Sustainable Farming Systems. (Eds.) Pankhurst, C.E., Double, B.M., Gupta, V.V.S.R. and Grace, P.R. CSIRO, Australia. pp. 245-249.
Kahlon, M.S., Lal, R., Varughese, M.A., 2013. Twenty years of tillage and mulching impacts on soil physical characteristics and carbon sequestration in Central Ohio. Soil Tillage Research 126, 151-158.
Kandeler, E., Kampichler, C., Horak, O., 1996. Influence of heavy metal on the functional diversity of soil microbial communities. Biology and Fertility of Soils 23, 299-306.
Kandeler, E., Stemmer, M., Klimanek, E.M., 1999. Response of soil microbial biomass, urease and xylanase within particle size fractions to long-term soil management. Soil Biology and Biochemistry 31, 261-273.
Kaur, T., Brar, B.S., Dhillon, N.S., 2008. Soil organic matter dynamics as affected by long-term use of organic and inorganic fertilizers under maize-wheat cropping system. Nutrient Cycling in Agroecosystems 81, 59-69.
Kemper, W.D., Rosenau, R.C., 1986. Methods of Soil Analysis (Part I). American Society of Agronomy, Madison, WI. pp. 425-442.
Kertesz, M.A., Mirleau, P. 2004. The role of soil microbes in plant sulphur nutrition. Journal of Experimental Botany 55(404), 1939-1945.
Klose, S., Tabatabai, M.A., 1999. Aryl sulphatase activity of microbial biomass in soils. Soil Science Society of America Journal 63, 569-574.
Landgraf, D., Klose, S., 2002. Mobile and readily available C and N fractions and their relationship to microbial biomass and selected enzyme activities in a sandy soil under different management systems. Journal of Plant Nutrition and Soil Science 165, 9-16.
Lee, Y.H., Yun, H.D., 2011. Changes in microbial community of agricultural soils subjected to organic farming system in Korean paddy fields with No-till management. Journal of the Korean Society for Applied Biological Chemistry 54(3), 434-441.
Lenka, N.K., Lal, R., 2013. Soil aggregation and greenhouse gas flux after 15 years of wheat straw and fertilizer management in a no-till system. Soil Tillage Research 126, 78-89.
Li, D., Zhu, H., Liu, K., Liu, X., Leggewie, G., Udvardi, M., Wang, D., 2002. Purple acid phosphatases of Arabidopsis thaliana. Journal of Biological Chemistry 277, 27772-27781.
Majumder, B., Mandal, B., Bandyopadhyay, P.K., 2008. Soil organic carbon pools and productivity in relation to nutrient management in a 20-year-old rice-berseem agroecosystem. Biology and Fertility of Soils 44, 451-561.
Makoi, J.H.J.R., Ndakidemi, P.A., 2008. Selected soil enzymes: Examples of their potential roles in the ecosystem. African Journal of Biotechnology 7(3), 181-191.
Malik, M.A., Khan, K.S., Marschner, P., Hassan, F., 2013. Microbial biomass, nutrient availability and nutrient uptake by wheat in two soils with organic amendments. Journal of Soil Science and Plant Nutrition 13(4), 955-966.
Mandal, B., Majumder, B., Bandyopadhyay, P.K., Hazra, G.C., Gangopadhyay, A., Samantaray, R.N., Misra, A.K., Chaudhury, J., Saha, M.N., Kundu, S., 2008. Potential of cropping systems and soil amendments for carbon sequestration in soils under long-term experiments in subtropical India. Global Change Biology 3, 357-369.
Manjaiah, K.M., Singh, D., 2001. Soil organic matter and biological properties after 26 years of maize-wheat-cowpea cropping as affected by manure and fertilization in a cambisol in semiarid region of India. Agriculture, Ecosystems & Environment 86, 155-162.
Marcote, I., Hernández, T., García, C., Polo, A., 2001. Influence of one or two successive application of organic fertilizers on the enzyme activity of a soil under barley cultivation. Bioresource Technology 79, 147-154.
Martinez, C.E., Tabatabai, M.A., 1997. Decomposition of biotechnology by products in soils. Journal of Environmental Quality 26, 625-632.
McGill, W.B., Colle, C.V., 1981. Comparative aspects of cycling of organic C, N, S and P through soil organic matter. Geoderma 26, 267-286.
Melero, S., Porras, J.C.R., Herencia, J.F., Madejon, E., 2006. Chemical and biochemical properties in a silty loam soil under conventional and organic management. Soil Tillage Research 90, 162-170.
Miller, S.S., Liu, J., Allan, D.L., Menzhuber, C.J., Fedorova, M., Vance, C.P., 2001. Molecular control of acid phosphatase secretion into the rhizosphere of proteoid roots from phosphorous stressed white lupin. Plant Physiology 127, 594-606.
Mobley, H.L.T., Hausinger, R.P., 1989. Microbial urease: significance, regulation and molecular characterization. Microbiological Reviews 53, 85-108.
Mohammadi, K., 2011. Effect of different fertilization methods on soil biological indexes. World Academy of Science, Engineering and Technology 78, 407-410.
Mtambanengwe, F., Mapfumo, P., 2008. Smallholder farmer management impacts on particulate and labile carbon fractions of granitic sandy soils in Zimbabwe. Nutrient Cycling in Agroecosystems 81, 1-15.
Mudge, S.R., Rae, A.L., Diatloff, E., Smith, F.W., 2002. Expression analysis suggests novel roles for members of Pht1 family of phosphate transporters in Arabidopsis. Plant Journal 31, 341-353.
Nannipieri, P., Ceccanti, B., Cervelli, S., Sequi, P., 1978. Stability and kinetic properties of humus-urease complexes. Soil Biology and Biochemistry 10, 143-147.
Nannipieri, P., Ceccanti, B. Grego, S., 1990. Ecological significance of the biological activity in soil. In: Soil Biochemistry, Volume 6. (Eds.) Bollag, J.M. and Stotzky, G. Marcel Dekker, New York. pp. 293-355.
Nardi, S., Morari, F., Berti, A., Tosoni, M., Giardini, L. 2004. Soil organic matter properties after 40 years of different use of organic and mineral fertilizers. European Journal of Agronomy 21, 357-367.
Ndakidemi, P.A., 2006. Manipulating legume/cereal mixtures to optimize the above and below ground interactions in the traditional African cropping systems. African Journal Biotechnology 5(25), 2526-2533.
Ndiaye, E.L., Sandeno, J.M., McGrath, D., Dick, R.P., 2000. Integrative biological indicators for detecting change in soil quality. American Journal of Alternative Agriculture 15, 26-36.
Ocio, J.A., Martinez, J., Brookes, P.C., 1991. Contribution of straw-derived N to total microbial biomass N following incorporation of cereal straw to soil. Soil Biology and Biochemistry 23, 655-659.
Ortas, I., Lal, R., 2014. Long-Term fertilization effect on agronomic yield and soil organic carbon under semi-arid Mediterranean Region. American Journal of Alternative Agriculture 4(9), 1086-1102.
Pavan, M.A., Bingham, F.T., Pratt, P.F., 1985. Chemical and mineralogical characteristics of selected acid soils of the State of Parana, Brazil. Turrialba 35, 131-139.
Pettit, N.M., Smith, A.R.J., Freedman, R.B., Burns, R.G., 1976. Soil urease: Activity, stability and kinetic properties. Soil Biology and Biochemistry 8, 479-484.
Polacco, J.C., 1977. Is nickel a universal component of plant ureases? Plant Science Letters 10, 249-255.
Powlson, D.S., Smith, P., Coleman, K., Smith, J.U., Glendining, M.J., Korschens, M., Franko, U., 1998. A European network of long-term sites for studies on soil organic matter. Soil Tillage Research 47, 263-274.
Reddy, G.B., Faza, A., 1989. Dehydrogenase activity in sludge amended soil. Soil Biology and Biochemistry 21(2), 327-333.
Rillig, M.C., Mummey, D.L., 2006. Mycorrhizas and soil structure. New Phytologist 171, 41-53.
Rillig, M.C., Wright, S.F., Nichols, K.A., Schmidt, W.F., Torn, M.S., 2001. Large contribution of arbuscular mycorrhizal fungi to soil carbon pools in tropical forest soils. Plant and Soil 233, 167-177.
Rillig, M.C., Wright, S.F., Shaw, M.R., Field, C.B., 2002. Artificial ecosystem warming positively affects arbuscular mycorrhizae but decreases soil aggregation. Oikos 97, 52-58.
Rodriguez, H., Gonzalez, T., Goire, I., Bashan, Y., 2004. Gluconic acid production and phosphate solubilization by the plant growth-promoting bacterium Azospirillum spp. Naturwissenschaften 91, 552-555.
Rudrappa, L., Purakayastha, T.J., Singh, D., Bhadraray, S., 2006. Long-term manuring and fertilization effects on soil organic carbon pools in a Typic Haplustept of semi-arid sub-tropical India. Soil Tillage Research 88, 180-192.
Saha, S., Prakash, V., Kundu, S., Kumar, N., Mina, B.L., 2008. Soil enzymatic activity as affected by long-term application of farm yard manures and mineral fertilizers under a rainfed soybean-wheat system in N-W Himalaya. European Journal Soil Biology 44, 509-515.
Sarathchandra, S.U., Perrott, K.W., 1981. Determination of phosphatase and aryl sulphatase activity in soils. Soil Biology and Biochemistry 13, 543-545.
Schinner, F., Öhlinger, R. Kandeler, E., 1991. Bodenbiologische Arbeitsmethoden. Springer, Berlin, Heidelberg, New York. pp. 7-9.
Schmidt, G., Laskowski, Sr.M., 1961. Phosphate ester cleavage (Survey). In: The Enzymes, 2nd Edition. (Eds.) Boyer, P.D., Lardy, H. and Myrback, K. Academic Press, New York. pp. 3-35.
Sharma, V., Kumar, V., Archana, G., Kumar, G.N., 2005. Substrate specificity of glucose dehydrogenase (GDH) of Enterobacter asburiae PSI3 and rock phosphate solubilization with GDH substrates as C sources. Canadian Journal of Microbiology 51, 477-482.
Simpson, J.R., Freney, J.R., Wetselaar, R., Muirhead, W.A., Leuning, R., Denmead, O.T., 1984. Transformations and losses of urea nitrogen after application to flooded rice. Australian Journal Agriculture Research 35, 189-200.
Six, J., Elliott, E.T., Paustian, K., Doran, J.W., 1998. Aggregate and soil organic matter accumulation in cultivated and native grassland soils. Soil Science Society of America Journal 62, 1367-1377.
Six, J., Elliott, E.T., Paustian, K., 2000. Soil macroaggregate turnover and microaggregate formation: A mechanism for C sequestration under no-tillage agriculture. Soil Biology and Biochemistry 32, 2099-2103.
Sparling, G.P., Whale, K.N., Ramsay, A.J., 1985. Quantifying the contribution from the soil microbial biomass to the extractable P-levels of fresh and air-dried soils. Australian Journal Soil Research 23, 613-621.
Speir, T.W., Ross, D.J., 1978. Soil phosphatase and sulphatase. In: Soil Enzymes. (Ed.) Burns, R.G. Academic Press, London, UK. pp. 197-250.
Sun, H., Wu, Y., Yu, D., Zhou, J., 2013. Altitudinal gradient of microbial biomass phosphorus and its relationship with microbial biomass carbon, nitrogen, and rhizosphere soil phosphorus on the eastern slope of Gongga Mountain, SW China. PLoS ONE 8(9), e72952. DOI: 10.1371/journal.pone.0072952.
Tabatabai, M.A., 1977. Effect of trace elements on urease activity in soils. Soil Biology and Biochemistry 9, 9-13.
Tisdall, J.M., Oades, J.M., 1982. Organic matter and water-stable aggregates in soils. Journal Soil Science 33(2), 141-163.
Truu, M., Truu, J., Ivask, M., 2008. Soil microbiological and biochemical properties for assessing the effect of agricultural management practices in Estonian cultivated soils. European Journal Soil Biology 44, 231-237.
Tullberg, J.N., Ziebarth, P.J., Li, Y., 2001. Tillage and traffic effects on runoff. Austalian Journal Soil Research 39, 249-257.
Van Cleemput, O., Wang, Z., 1991. Urea transformations and urease inhibitors. Trends in Soil Science 1, 45-51.
van der Heijden, M.G.A., Klironomos, J.N., Ursic, M., Moutoglis, P., Streitwolf-Engel, R., Boller, T., Wiemken, A., Sanders, I.R., 1998. Mycorrhizal fungal diversity determines plant biodiversity, ecosystem variability and productivity. Nature 396, 69-72.
Verma, B.C., Datta, S.P., Rattan, R.K., Singh, A.K., 2010. Monitoring changes in soil organic carbon pools, nitrogen, phosphorus, and sulfur under different agricultural management practices in the tropics. Environmental Monitoring and Assessment 171, 579-593.
Verma, B.C., Datta, S.P., Rattan, R.K., Singh, A.K., 2011. Effect of temperature, moisture and different nitrogen sources on organic carbon pools and available nutrients in an Alluvia. Journal of the Indian Society of Soil Science 59(3), 286-294.
Verma, B.C., Datta, S.P., Rattan, R.K., Singh, A.K., 2013. Labile and stabilized fractions of soil organic carbon in some intensively cultivated alluvial soils. Journal of Environmental Biology 34, 1069-1075.
Verma, B.C., Choudhury, B.U., Ramkrushna, G.I., Kumar, M., Bordoloi, L.J., Hazarika, S., Ramesh, T., Bhuyan, D., 2014. Recovery of soil organic carbon under different nutrient management practices in acid soil of Meghalaya. Indian Journal Hill Farming 27(1), 42-46.
Versaw, W.K., Harrison, M.J., 2002. A chloroplast phosphate transporter, PHT2; 1, Influences allocation of phosphate within the plant and phosphate-starvation responses. Plant Cell 14, 1751-1766.
Vong, P.C., Dedourge, O., Lasserre-Joulin, F., Guckert, A., 2003. Immobilized-S, microbial biomass-S and soil aryl sulphatase activity in the rhizosphere soil of rape and barley as affected by labile substrate C and N additions. Soil Biology and Biochemistry 35, 1651-1661.
Waldrop, M.P., Zak, D.R., Sinsabaugh, R.L., Gallo, M., Lauber, C., 2004. Nitrogen deposition modifies soil carbon storage through changes in microbial enzymatic activity. Ecological Applications 14, 1172-1177.
Walkley, A., Black, I.A., 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.
Wang, Q., Xiao, F., He, T., Wang, S., 2013. Responses of labile soil organic carbon and enzyme activity in mineral soils to forest conversion in the subtropics. Annals of Forest Science 70, 579–587. DOI: 10.1007/s13595-013-0294-8.
Wang, X.L., Su, Y.R., Huang, D.Y., Xiao, H.A., Wang, L.G., Wu, J.S., 2006. Effects of land use on soil organic C and microbial biomass C in hilly red soil region in subtropical China. Scientia Agricultura Sinica 39(4), 750-757.
Wick, B., Kühne, R.F., Vlek, P.L.G., 1998. Soil microbiological parameters as indicators of soil quality under improved fallow management systems in southwestern Nigeria. Plant and Soil 202, 97-107.
Williams, C.H., 1975. The chemical nature of sulphur compounds in soil. In: Sulphur in Australasian Agriculture. (Ed.) McLachlan, K.D. Sydney University Press. pp. 21-30.
Wright, A.L., Reddy, K.R., 2001. Phosphorus loading effects on extracellular enzyme activity in everglades wetland. Soil Science Society of America Journal 65, 588-595.
Wright, S.F., Upadhyaya, A., 1996. Extraction of an abundant and unusual protein from soil and comparison with hyphal protein of arbuscular mycorrhizal fungi. Soil Science 161, 575-586.
Wright, S.F., Franke-Snyder, M., Morton, J.B., Upadhyaya, A., 1996. Time course study and partial characterization of a protein on hyphae of arbuscular mycorrhizal fungi during active colonization of roots. Plant and Soil 181, 193-203.
Xu, H., Xiao, R., Song, T., 2008. Effects of different fertilization on microbial biomass carbon from the red soil in tea garden. Frontiers of Agriculture in China 2(4), 418-422.
Yi, G.H., Li, G.S., Zhao, L.W., Guo, C.S., 2009, Effects of fertilization on wheat yield and soil organic carbon accumulation in rainfed loessial tablelands. Journal of Plant Nutrition and Fertilizers 15, 1333-1338.
Zantua, M.I., Bremner, J.M., 1977, Stability of urease in soils. Soil Biology and Biochemistry 9, 135-140.