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Volumn 51, Issue 6, 2013, Pages 529-538

An assessment of the guidelines in Victoria, Australia, for land application of biosolids based on plant-available nitrogen

Author keywords

Application rates; Biosolids; Conventional fertilisers; Nitrogen mineralisation; Perennial ryegrass; Plant available nitrogen

Indexed keywords

AGRICULTURAL PRODUCTION SYSTEM; AGRICULTURAL PURPOSE; APPLICATION RATES; ENVIRONMENTAL RISKS; FIELD CALIBRATION; NITROGEN MINERALISATION; PERENNIAL RYEGRASS; VICTORIA , AUSTRALIA;

EID: 84888220866     PISSN: 1838675X     EISSN: None     Source Type: Journal    
DOI: 10.1071/SR13191     Document Type: Article
Times cited : (14)

References (54)
  • 1
    • 0034234306 scopus 로고    scopus 로고
    • Nitrogen fertilizer equivalency of sewage biosolids applied to dryland winter wheat
    • doi:10.2134/jeq2000.00472425002900040043x
    • Barbarick KA, Ippolito JA (2000) Nitrogen fertilizer equivalency of sewage biosolids applied to dryland winter wheat. Journal of Environmental Quality 29, 1345-1351. doi:10.2134/jeq2000.00472425002900040043x
    • (2000) Journal of Environmental Quality , vol.29 , pp. 1345-1351
    • Barbarick, K.A.1    Ippolito, J.A.2
  • 2
    • 34249080396 scopus 로고    scopus 로고
    • Nutrient assessment of a dryland wheat agroecosystem after 12 years of biosolids applications
    • doi:10.2134/agronj2006.0221
    • Barbarick KA, Ippolito JA (2007) Nutrient assessment of a dryland wheat agroecosystem after 12 years of biosolids applications. Agronomy Journal 99, 715-722. doi:10.2134/agronj2006.0221
    • (2007) Agronomy Journal , vol.99 , pp. 715-722
    • Barbarick, K.A.1    Ippolito, J.A.2
  • 3
    • 0022162798 scopus 로고
    • Factors affecting the mineralization of nitrogen in sewage sludge applied to soils
    • doi:10.2136/sssaj 1985.03615995004900060014x
    • Barbarika A, Sikora LJ, Colacicco D (1985) Factors affecting the mineralization of nitrogen in sewage sludge applied to soils. Soil Science Society of America Journal 49, 1403-1406. doi:10.2136/sssaj 1985. 03615995004900060014x
    • (1985) Soil Science Society of America Journal , vol.49 , pp. 1403-1406
    • Barbarika, A.1    Sikora, L.J.2    Colacicco, D.3
  • 4
    • 0022210394 scopus 로고
    • Chloroform fumigation and the release of soil nitrogen: The effects of fumigation time and temperature
    • doi:10.1016/0038-0717(85)90143-9
    • Brookes PC, Kragt JF, Powlson DS, Jenkinson DS (1985) Chloroform fumigation and the release of soil nitrogen: the effects of fumigation time and temperature. Soil Biology & Biochemistry 17, 831-835. doi:10.1016/0038- 0717(85)90143-9
    • (1985) Soil Biology & Biochemistry , vol.17 , pp. 831-835
    • Brookes, P.C.1    Kragt, J.F.2    Powlson, D.S.3    Jenkinson, D.S.4
  • 5
    • 70349488502 scopus 로고    scopus 로고
    • Effects of temperature, moisture and forest succession on nitrogen mineralization in hillside red soils in mid-subtropical region, China
    • In Chinese
    • Chen FS, Yu K, Gan L, Liu Y, Hu XF, Ge G (2009) Effects of temperature, moisture and forest succession on nitrogen mineralization in hillside red soils in mid-subtropical region, China. Ying Yong Sheng Tai Xue Bao 20, 1529-1535. [In Chinese]
    • (2009) Ying Yong Sheng Tai Xue Bao , vol.20 , pp. 1529-1535
    • Chen, F.S.1    Yu, K.2    Gan, L.3    Liu, Y.4    Hu, X.F.5    Ge, G.6
  • 6
    • 0032915555 scopus 로고    scopus 로고
    • Nitrogen recovery from heat-dried and dewatered biosolids applied to forage grasses
    • doi:10.2134/jeq1999. 00472425002800030004x
    • Cogger CG, Sullivan DM, Bary AI, Fransen SC (1999) Nitrogen recovery from heat-dried and dewatered biosolids applied to forage grasses. Journal of Environmental Quality 28, 754-759. doi:10.2134/jeq1999. 00472425002800030004x
    • (1999) Journal of Environmental Quality , vol.28 , pp. 754-759
    • Cogger, C.G.1    Sullivan, D.M.2    Bary, A.I.3    Fransen, S.C.4
  • 8
    • 30744465105 scopus 로고    scopus 로고
    • Efficiency of five biosolids to supply nitrogen and phosphorus to ryegrass
    • doi:10.1590/S0100-204X2004001100012
    • Corrêa RS (2004) Efficiency of five biosolids to supply nitrogen and phosphorus to ryegrass. Pesquisa Agropecuária Brasileira 39, 1133-1139. doi:10.1590/S0100-204X2004001100012
    • (2004) Pesquisa Agropecuária Brasileira , vol.39 , pp. 1133-1139
    • Corrêa, R.S.1
  • 9
    • 80052863416 scopus 로고    scopus 로고
    • Nitrogen mineralization potential in important agricultural soils of Hawaii
    • SCM-15. July 2006. Cooperative Extension Service, College of Tropical Agriculture and Human Resources, University of Hawaii, Honolulu, HI
    • Deenik J (2006) Nitrogen mineralization potential in important agricultural soils of Hawaii. Soil and Crop Management, SCM-15. July 2006. Cooperative Extension Service, College of Tropical Agriculture and Human Resources, University of Hawaii, Honolulu, HI.
    • (2006) Soil and Crop Management
    • Deenik, J.1
  • 10
    • 49149128171 scopus 로고    scopus 로고
    • Plant-available nitrogen supply from granulated biosolids: Implications for land application guidelines
    • doi:10.1071/SR07234
    • Eldridge SM, Chan KY, Xu ZH, Chen CR, Barchia I (2008) Plant-available nitrogen supply from granulated biosolids: implications for land application guidelines. Soil Research 46, 423-436. doi:10.1071/SR07234
    • (2008) Soil Research , vol.46 , pp. 423-436
    • Eldridge, S.M.1    Chan, K.Y.2    Xu, Z.H.3    Chen, C.R.4    Barchia, I.5
  • 14
    • 84982334660 scopus 로고
    • Some factors in low-temperature storage influencing the mineralisable-nitrogen of soils
    • doi:10.1002/jsfa.2740151203
    • Harding DE, Ross DJ (1964) Some factors in low-temperature storage influencing the mineralisable-nitrogen of soils. Journal of the Science of Food and Agriculture 15, 829-834. doi:10.1002/jsfa.2740151203
    • (1964) Journal of the Science of Food and Agriculture , vol.15 , pp. 829-834
    • Harding, D.E.1    Ross, D.J.2
  • 16
    • 0025787604 scopus 로고
    • Predicting nitrate formation from soil, fertilizer, crop residue, and sludge with thermal units
    • doi:10.2134/jeq1991.00472425002000040024x
    • Honeycutt CW, Potaro LJ, Halteman WA (1991) Predicting nitrate formation from soil, fertilizer, crop residue, and sludge with thermal units. Journal of Environmental Quality 20, 850-856. doi:10.2134/jeq1991.00472425002000040024x
    • (1991) Journal of Environmental Quality , vol.20 , pp. 850-856
    • Honeycutt, C.W.1    Potaro, L.J.2    Halteman, W.A.3
  • 17
    • 14844310269 scopus 로고    scopus 로고
    • Nitrogen mineralization potentials in three tropical soils treated with biosolids
    • doi:10.1016/j.chemosphere.2004.10.042
    • Hseu Z-Y, Huang C-C (2005) Nitrogen mineralization potentials in three tropical soils treated with biosolids. Chemosphere 59, 447-454. doi:10.1016/j.chemosphere.2004.10.042
    • (2005) Chemosphere , vol.59 , pp. 447-454
    • Hseu, Z.-Y.1    Huang, C.-C.2
  • 19
    • 0000677835 scopus 로고
    • Nitrogen in organic forms
    • In. No. 9. (Eds AL Page, RH Miller, DR Keeney) (American Society of Agronomy: Madison, WI)
    • Keeney DR, Nelson DW (1982) Nitrogen in organic forms. In 'Methods of soil analysis. Part 2. Agronomy'. No. 9. (Eds AL Page, RH Miller, DR Keeney) (American Society of Agronomy: Madison, WI)
    • (1982) Methods of Soil Analysis. Part 2. Agronomy
    • Keeney, D.R.1    Nelson, D.W.2
  • 20
    • 84873865867 scopus 로고    scopus 로고
    • Land application of biosolids in the USA: A review
    • doi:10.1155/2012/201462
    • Lu Q, He ZL, Stoffella PJ (2012) Land application of biosolids in the USA: A review. Applied and Environmental Soil Science 2012, 201462. doi:10.1155/2012/201462
    • (2012) Applied and Environmental Soil Science , vol.2012 , pp. 201462
    • Lu, Q.1    He, Z.L.2    Stoffella, P.J.3
  • 21
    • 0032793676 scopus 로고    scopus 로고
    • Nitrogen availability and leaching from soil amended with municipal solid waste compost
    • doi:10.2134/jeq1999.00472 425002800040003x
    • Mamo M, Rosen CJ, Halbach TR (1999) Nitrogen availability and leaching from soil amended with municipal solid waste compost. Journal of Environmental Quality 28, 1074-1082. doi:10.2134/jeq1999.00472 425002800040003x
    • (1999) Journal of Environmental Quality , vol.28 , pp. 1074-1082
    • Mamo, M.1    Rosen, C.J.2    Halbach, T.R.3
  • 22
    • 0002236334 scopus 로고
    • Bulk density
    • In. Commonwealth Agricultural Bureaux Technical Communication No. 54. (Ed. J Loveday) (CAB: Farnham Royal, UK)
    • McIntyre D, Loveday J (1974) Bulk density. In 'Methods of analysis for irrigated soils'. Commonwealth Agricultural Bureaux Technical Communication No. 54. (Ed. J Loveday) (CAB: Farnham Royal, UK)
    • (1974) Methods of Analysis for Irrigated Soils
    • McIntyre, D.1    Loveday, J.2
  • 24
    • 25944440552 scopus 로고    scopus 로고
    • NSW EPA. (Environment Protection Authority: Chatswood, NSW)
    • NSW EPA (1997) 'Use and disposal of biosolids products.' (Environment Protection Authority: Chatswood, NSW)
    • (1997) Use and Disposal of Biosolids Products
  • 25
    • 1642290957 scopus 로고    scopus 로고
    • Phytoavailability of biosolids phosphorus contribution of the florida agricultural experiment station journal series no. R-08955
    • doi:10.2134/jeq2004.0703
    • O'Connor GA, Sarkar D, Brinton SR, Elliott HA, Martin FG (2004) Phytoavailability of biosolids phosphorus contribution of the Florida Agricultural Experiment Station Journal Series no. R-08955. Journal of Environmental Quality 33, 703-712. doi:10.2134/jeq2004.0703
    • (2004) Journal of Environmental Quality , vol.33 , pp. 703-712
    • O'Connor, G.A.1    Sarkar, D.2    Brinton, S.R.3    Elliott, H.A.4    Martin, F.G.5
  • 26
    • 0022581379 scopus 로고
    • Factors affecting the response of cut grass to the nitrogen content of dairy cow slurry
    • doi:10.1016/0141-4607(86)90093-4
    • Pain BF, Smith KA, Dyer CJ (1986) Factors affecting the response of cut grass to the nitrogen content of dairy cow slurry. Agricultural Wastes 17, 189-202. doi:10.1016/0141-4607(86)90093-4
    • (1986) Agricultural Wastes , vol.17 , pp. 189-202
    • Pain, B.F.1    Smith, K.A.2    Dyer, C.J.3
  • 27
    • 0141682218 scopus 로고    scopus 로고
    • Dynamics and plant uptake of nitrogen and phosphorus in soil amended with sewage sludge
    • doi:10.1016/S0929-1393(03)00087-8
    • Petersen SO, Petersen J, Rubæk GH (2003) Dynamics and plant uptake of nitrogen and phosphorus in soil amended with sewage sludge. Applied Soil Ecology 24, 187-195. doi:10.1016/S0929-1393(03)00087-8
    • (2003) Applied Soil Ecology , vol.24 , pp. 187-195
    • Petersen, S.O.1    Petersen, J.2    Rubæk, G.H.3
  • 30
    • 77957282074 scopus 로고    scopus 로고
    • Land application of sewage sludge (biosolids) in Australia: Risks to the environment and food crops
    • doi:10.2166/wst.2010.274
    • Pritchard DL, Penney N, McLaughlin MJ, Rigby H, Schwarz K (2010) Land application of sewage sludge (biosolids) in Australia: risks to the environment and food crops. Water Science and Technology 62, 48-57. doi:10.2166/wst.2010.274
    • (2010) Water Science and Technology , vol.62 , pp. 48-57
    • Pritchard, D.L.1    Penney, N.2    McLaughlin, M.J.3    Rigby, H.4    Schwarz, K.5
  • 31
    • 57349162802 scopus 로고    scopus 로고
    • Fate of applied biosolids nitrogen in a cut and remove forage system on an alluvial clay loam soil
    • doi:10.1071/SR08127
    • Pu C, Bell M, Barry G, Want P (2008) Fate of applied biosolids nitrogen in a cut and remove forage system on an alluvial clay loam soil. Soil Research 46, 703-709. doi:10.1071/SR08127
    • (2008) Soil Research , vol.46 , pp. 703-709
    • Pu, C.1    Bell, M.2    Barry, G.3    Want, P.4
  • 32
    • 84859319256 scopus 로고    scopus 로고
    • Estimating mineralisation of organic nitrogen from biosolids and other organic wastes applied to soils in subtropical Australia
    • Pu G, Bell M, Barry G, Want P (2012) Estimating mineralisation of organic nitrogen from biosolids and other organic wastes applied to soils in subtropical Australia. Soil Research 50, 91-104.
    • (2012) Soil Research , vol.50 , pp. 91-104
    • Pu, G.1    Bell, M.2    Barry, G.3    Want, P.4
  • 33
    • 0036276282 scopus 로고    scopus 로고
    • Nitrogen mineralization at different moisture levels in soils under wheat-rice cropping systems
    • doi:10.1081/CSS-120004286
    • Rahman MS, Rashid GH (2002) Nitrogen mineralization at different moisture levels in soils under wheat-rice cropping systems. Communications in Soil Science and Plant Analysis 33, 1363-1374. doi:10.1081/CSS-120004286
    • (2002) Communications in Soil Science and Plant Analysis , vol.33 , pp. 1363-1374
    • Rahman, M.S.1    Rashid, G.H.2
  • 35
    • 70450196646 scopus 로고    scopus 로고
    • The influence of soil and biosolids type, and microbial immobilisation on nitrogen availability in biosolids-amended agricultural soils-implications for fertiliser recommendations
    • doi:10.1111/j.1475-2743.2009.00240.x
    • Rigby H, Perez-Viana F, Cass J, Rogers M, Smith SR (2009) The influence of soil and biosolids type, and microbial immobilisation on nitrogen availability in biosolids-amended agricultural soils-implications for fertiliser recommendations. Soil Use and Management 25, 395-408. doi:10.1111/j.1475-2743. 2009.00240.x
    • (2009) Soil Use and Management , vol.25 , pp. 395-408
    • Rigby, H.1    Perez-Viana, F.2    Cass, J.3    Rogers, M.4    Smith, S.R.5
  • 37
    • 0001424519 scopus 로고
    • Measurement of microbial sulfur in soil
    • doi:10.1016/0038-0717(81)90040-7
    • Saggar S, Bettany JR, Stewart JWB (1981) Measurement of microbial sulfur in soil. Soil Biology & Biochemistry 13, 493-498. doi:10.1016/0038-0717(81) 90040-7
    • (1981) Soil Biology & Biochemistry , vol.13 , pp. 493-498
    • Saggar, S.1    Bettany, J.R.2    Stewart, J.W.B.3
  • 38
    • 37049093005 scopus 로고
    • The berthelot or indophenol reaction and its use in the analytical chemistry of nitrogen. A review
    • doi:10.1039/an9840900549
    • Searle PL (1984) The Berthelot or indophenol reaction and its use in the analytical chemistry of nitrogen. A review. Analyst 109, 549-568. doi:10.1039/an9840900549
    • (1984) Analyst , vol.109 , pp. 549-568
    • Searle, P.L.1
  • 39
    • 0034987971 scopus 로고    scopus 로고
    • Factors controlling N mineralization, nitrification, and nitrogen losses in an Oxisol amended with sewage sludge
    • doi:10.1071/SR00026
    • Sierra J, Fontaine S, Desfontaines L (2001) Factors controlling N mineralization, nitrification, and nitrogen losses in an Oxisol amended with sewage sludge. Soil Research 39, 519-534. doi:10.1071/SR00026
    • (2001) Soil Research , vol.39 , pp. 519-534
    • Sierra, J.1    Fontaine, S.2    Desfontaines, L.3
  • 41
    • 0036276443 scopus 로고    scopus 로고
    • Nitrogen release and fertiliser value of thermally-dried biosolids
    • doi:10.1111/j.1747-6593.2002.tb00382.x
    • Smith SR, Durham E (2002) Nitrogen release and fertiliser value of thermally-dried biosolids. Water and Environment Journal 16, 121-126. doi:10.1111/j.1747-6593.2002.tb00382.x
    • (2002) Water and Environment Journal , vol.16 , pp. 121-126
    • Smith, S.R.1    Durham, E.2
  • 42
    • 0347935909 scopus 로고
    • A comparison of the effects of organic and inorganic nitrogen fertilizers on the growth response of summer cabbage (Brassica oleracea var. Capitata cv. Hispi F.)
    • Smith SR, Hadley P (1988) A comparison of the effects of organic and inorganic nitrogen fertilizers on the growth response of summer cabbage (Brassica oleracea var. capitata cv. Hispi F.). Journal of Horticultural Science 63, 615-620.
    • (1988) Journal of Horticultural Science , vol.63 , pp. 615-620
    • Smith, S.R.1    Hadley, P.2
  • 43
    • 0242522914 scopus 로고    scopus 로고
    • Nitrogen dynamics under Lolium perenne after a single application of three different sewage sludge types from the same treatment stream
    • doi:10.10 16/S0960-8524(03)00205-0
    • Smith MTE, Tibbett M (2004) Nitrogen dynamics under Lolium perenne after a single application of three different sewage sludge types from the same treatment stream. Bioresource Technology 91, 233-241. doi:10.10 16/S0960-8524(03)00205-0
    • (2004) Bioresource Technology , vol.91 , pp. 233-241
    • Smith, M.T.E.1    Tibbett, M.2
  • 44
    • 0032210960 scopus 로고    scopus 로고
    • Nitrate dynamics in biosolidstreated soils. I. Influence of biosolids type and soil type
    • doi:10.1016/S0960-8524(97)00095-3
    • Smith SR, Woods V, Evans TD (1998a) Nitrate dynamics in biosolidstreated soils. I. Influence of biosolids type and soil type. Bioresource Technology 66, 139-149. doi:10.1016/S0960-8524(97)00095-3
    • (1998) Bioresource Technology , vol.66 , pp. 139-149
    • Smith, S.R.1    Woods, V.2    Evans, T.D.3
  • 45
    • 0032210829 scopus 로고    scopus 로고
    • Nitrate dynamics in biosolidstreated soils. III. Significance of the organic nitrogen, a twin-pool exponential model for nitrogen management and comparison with the nitrate production from animal wastes
    • doi:10.1016/S0960-8524(97)00097-7
    • Smith SR, Woods V, Evans TD (1998b) Nitrate dynamics in biosolidstreated soils. III. Significance of the organic nitrogen, a twin-pool exponential model for nitrogen management and comparison with the nitrate production from animal wastes. Bioresource Technology 66, 161-174. doi:10.1016/S0960-8524(97)00097-7
    • (1998) Bioresource Technology , vol.66 , pp. 161-174
    • Smith, S.R.1    Woods, V.2    Evans, T.D.3
  • 47
    • 77954537216 scopus 로고    scopus 로고
    • Soil Survey Staff. 11th edn (USDA-Natural Resources Conservation Service: Washington, DC)
    • Soil Survey Staff (2010) 'Keys to Soil Taxonomy.' 11th edn (USDA-Natural Resources Conservation Service: Washington, DC)
    • (2010) Keys to Soil Taxonomy
  • 48
    • 0000016048 scopus 로고
    • Nitrogen mineralization-water relations in soils
    • doi:10.2136/sssaj1974.03615995003800010032x
    • Stanford G, Epstein E (1974) Nitrogen mineralization-water relations in soils. Soil Science Society of America Journal 38, 103-107. doi:10.2136/ sssaj1974.03615995003800010032x
    • (1974) Soil Science Society of America Journal , vol.38 , pp. 103-107
    • Stanford, G.1    Epstein, E.2
  • 49
    • 84957794275 scopus 로고
    • Technicon Instrument Corporation. (W. Technicon Instrument Corpn: Tarrytown, NY)
    • Technicon Instrument Corporation (1971) 'Nitrate and nitrite in water. Industrial Method No. 32-69.' (W. Technicon Instrument Corpn: Tarrytown, NY)
    • (1971) Nitrate and Nitrite in Water. Industrial Method No. 32-69
  • 50
    • 0017549450 scopus 로고
    • Decomposition of sewage sludge compost in Soil: I. Carbon and nitrogen transformation
    • doi:10.2134/jeq1977. 00472425000600040028x
    • Tester CF, Sikora LJ, Taylor JM, Parr JF (1977) Decomposition of sewage sludge compost in Soil: I. Carbon and nitrogen transformation. Journal of Environmental Quality 6, 459-463. doi:10.2134/jeq1977. 00472425000600040028x
    • (1977) Journal of Environmental Quality , vol.6 , pp. 459-463
    • Tester, C.F.1    Sikora, L.J.2    Taylor, J.M.3    Parr, J.F.4
  • 51
    • 0034013910 scopus 로고    scopus 로고
    • Nitrogen leaching and crop availability in manured catch crop systems in Sweden
    • doi:10.1023/A:1009821519042
    • Torstensson G, Aronsson H (2000) Nitrogen leaching and crop availability in manured catch crop systems in Sweden. Nutrient Cycling in Agroecosystems 56, 139-152. doi:10.1023/A:1009821519042
    • (2000) Nutrient Cycling in Agroecosystems , vol.56 , pp. 139-152
    • Torstensson, G.1    Aronsson, H.2
  • 52
    • 0023488186 scopus 로고
    • An extraction method for measuring soil microbial biomass C
    • doi:10.1016/0038-0717(87)90052-6
    • Vance ED, Brookes PC, Jenkinson DS (1987) An extraction method for measuring soil microbial biomass C. Soil Biology & Biochemistry 19, 703-707. doi:10.1016/0038-0717(87)90052-6
    • (1987) Soil Biology & Biochemistry , vol.19 , pp. 703-707
    • Vance, E.D.1    Brookes, P.C.2    Jenkinson, D.S.3
  • 53
    • 84866683475 scopus 로고    scopus 로고
    • Effects of environmental factors on the soil nitrogen transformation in terrestrial ecosystems
    • In. 28-30 May 2012. (The Institute of Electrical and Electronics Engineers)
    • Wang H, Zhang S-S, Yang L-Y, Chen Q-L, Yang B-S (2012) Effects of environmental factors on the soil nitrogen transformation in terrestrial ecosystems. In 'Biomedical Engineering and Biotechnology (iCBEB), 2012 International Conference'. 28-30 May 2012. pp. 1404-1407. (The Institute of Electrical and Electronics Engineers)
    • (2012) Biomedical Engineering and Biotechnology (ICBEB), 2012 International Conference , pp. 1404-1407
    • Wang, H.1    Zhang, S.-S.2    Yang, L.-Y.3    Chen, Q.-L.4    Yang, B.-S.5
  • 54
    • 33746463610 scopus 로고    scopus 로고
    • Effects of moisture and temperature on carbon and nitrogen mineralization in mine tailings mixed with sewage sludge
    • doi:10.2134/jeq2005.0142
    • Wennman P, Kätterer T (2006) Effects of moisture and temperature on carbon and nitrogen mineralization in mine tailings mixed with sewage sludge. Journal of Environmental Quality 35, 1135-1141. doi:10.2134/jeq2005.0142
    • (2006) Journal of Environmental Quality , vol.35 , pp. 1135-1141
    • Wennman, P.1    Kätterer, T.2


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