Nitrogen and sulphur management: Challenges for organic sources in temperate agricultural systems

Soil Use and Management

Volumn 21, Issue SUPPL., 2005, Pages 82-93

  McNeill, A M ^a   Eriksen, J ^b   Bergstrom L ^c   Smith, K A ^d   Marstorp, H ^c   Kirchmann, H ^c   Nilsson, I ^c  

^a UNIVERSITY OF ADELAIDE   (Australia)

^b DANISH INSTITUTE OF AGRICULTURAL SCIENCES   (Denmark)

^c SWEDISH UNIVERSITY OF AGRICULTURAL SCIENCES   (Sweden)

^d UNIVERSITY OF EDINBURGH   (United Kingdom)

Author keywords

Animal wastes; Biological nitrogen fixation; Excreta; Leaching; Manures; Plant residues; Soil organic matter; Volatilization

Indexed keywords

AGRICULTURAL MANAGEMENT; NITROGEN; SULFUR;

ANIMALIA;

EID: 23844546261     PISSN: 02660032     EISSN: None     Source Type: Journal    
DOI: 10.1079/SUM2005303     Document Type: Conference Paper

References (150)

1. Aaes O & Thøgersen R 1999. Sulphur to cattle. LK-note 427. The Danish Advisory Centre Skejby Denmark. [In Danish]
2. Anderson GC Fillery IRP Dolling P & Asseng S 1998a. Nitrogen and water flows under pasture-wheat and lupin-wheat rotations in deep sands in Western Australia 1. Nitrogen fixation in legumes, net N mineralisation, and utilisation of soil-derived nitrogen. Australian Journal of Agricultural Research 49, 329-343.
3. Anderson GC Fillery IRP Dunin FX Dolling PJ & Asseng S 1998b. Nitrogen and water flows under pasture-wheat and lupin-wheat rotations in deep sands in Western Australia 2. Drainage and nitrate leaching. Australian Journal of Agricultural Research 49, 345-361.
4. Arah JRM Smith KA Crichton IJ & Li HS 1991. Nitrous oxide production and denitrification in Scottish arable soils. Journal of Soil Science 42, 351-367.
5. Armstrong EL Heenan DP Pate JS & Unkovich MJ 1997. Nitrogen benefits of lupins, field pea, and chickpea to wheat production in south-eastern Australia. Australian Journal of Agricultural Research 48, 39-47.
6. Aronsson H 2000. Nitrogen turnover and leaching in cropping systems with ryegrass catch crops. Acta Universitatis Agriculturae Sueciae - Agraria PhD Thesis Swedish University of Agricultural Sciences Uppsala.
7. Badaruddin M & Meyer DW 1994. Grain legume effects on soil nitrogen, grain yield, and nitrogen nutrition of wheat. Crop Science 34, 1304-1309.
8. Baggs EM Rees RM Smith KA & Vinten AJA 2000. Nitrous oxide emissions from soils after incorporating crop residues. Soil Use and Management 16, 82-87.
9. Ball RP & Ryden JC 1984. Nitrogen relationships in intensively managed temperate grasslands. Plant and Soil 76, 23-33.
10. Banwart WL & Bremner JM 1975. Identification of sulfur gases evolved from animal manures. Journal of Environmental Quality 4, 363-366.
11. Barrow NJ 1960. A comparison of the mineralization of nitrogen and of sulfur from decomposing organic materials. Australian Journal of Agricultural Research 11, 960-969.
12. Beard WE & Guenzi WD 1983. Volatile sulfur compounds from a redox-controlled cattle-manure slurry. Journal of Environmental Quality 12, 113-116.
13. Beck DP Wery J Saxena MC & Ayadi A 1991. Dinitrogen fixation and nitrogen balance in cool-season food legumes. Agronomy Journal 83, 334-341.
14. Beckwith CP Cooper J Smith KA & Shepherd MA 1998. Nitrogen leaching loss following application of organic manures to sandy soils in arable cropping. Soil Use and Management 14, 123-130.
15. Bergström L & Brink N 1986. Effects of differentiated applications of fertilizer N on leaching and distribution of N in the soil. Plant and Soil 93, 333-345.
16. 3. Journal of Environmental Quality 30, 1659-1667.
17. Bergström LF & Kirchmann H 1999. Leaching of total nitrogen from nitrogen-15-labeled poultry manure and inorganic nitrogen fertilizer. Journal of Environmental Quality 28, 1283-1290.
18. Bijay-Singh Ryden JC & Whitehead JC 1988. Some relationships between denitrification potential and fractions of organic carbon in air-dried and field-moist soils. Soil Biology and Biochemistry 20, 737-741.
19. Blair GJ 2002. Sulphur fertilisers: A global perspective. Proceedings No. 498, International Fertiliser Society York UK 36 pp.
20. 13N fertilization. Plant and Soil 104, 219-226.
21. Brown KA 1982. Sulphur in the environment: a review. Environmental Pollution series B 3, 47-80.
22. Bussink DW & Oenema O 1998. Ammonia volatilization from dairy farming systems in temperate areas: a review. Nutrient Cycling in Agroecosystems 51, 19-33.
23. Chalk PM 1991. The contribution of associative and symbiotic nitrogen fixation to the nitrogen nutrition of non-legumes. Plant and Soil 132, 29-39.
24. Chambers BJ Smith KA & van der Weerden TJ 1997. Ammonia emissions following the land spreading of solid manures. In: Gaseous nitrogen emissions from grasslands, eds SC Jarvis & BF Pain, CAB International Wallingford UK pp 275-280.
25. Chao TT Harward ME & Fang SC 1962. Adsorption and desorption phenomena of sulfate ions in soils. Soil Science Society of America Proceedings 26, 234-237.
26. Cowell LE Bremer E & Van Kessel C 1989. Yield and nitrogen fixation of pea and lentil as affected by intercropping and N application. Canadian Journal of Soil Science 69, 243-251.
27. Curtin D & Syers JK 1990. Extractability and adsorption of sulphate in soils. Journal of Soil Science 41, 295-304.
28. Cuttle SP Scurlock RV & Davies BMS 1998. A 6 year comparison of nitrate leaching from grass/clover and N-fertilized grass pastures grazed by sheep. Journal of Agricultural Science Cambridge 131, 39-50.
29. Danso SKA Zapata F Hardarson G & Fried M 1987. Nitrogen fixation in fababeans as affected by plant population density in sole or intercropped systems with barley. Soil Biology and Biochemistry 19, 411-415.
30. Dentener GJ & Crutzen PJ 1994. A three-dimensional model of the global ammonia cycle. Journal of Atmospheric Chemistry 19, 331-369.
31. De Neve S Gaona Saez S Chaves Daguilar B Sleutel S & Hofman G 2004. Manipulating N mineralization from high N crop residues using on- and off-farm organic materials. Soil Biology and Biochemistry 36, 127-134.
32. ECETOC 1994. Ammonia emissions to air in Western Europe. Technical Report 62. European Centre for Ecotoxicology and Toxicology of Chemicals Brussels Belgium 195 pp.
33. Eriksen J 1996. Incorporation of S into soil organic matter in the field as determined by the natural abundance of stable S isotopes. Biology and Fertility of Soils 22, 149-155.
34. Eriksen J 2002. Organic manures as sources of fertiliser sulphur. Proceedings No. 505, International Fertiliser Society York UK 20 pp.
35. Eriksen J & Askegaard M 2000. Sulphate leaching in an organic crop rotation on sandy soil in Denmark. Agriculture, Ecosystems and Environment 78, 107-114.
36. Eriksen J Mortensen J Kjellerup VK & Kristjansen O 1995. Forms and plant availability of sulfur in cattle and pig slurry. Zeitschrift für Pflanzenernährung und Bodenkunde 158, 113-116.
37. Eriksen J Murphy M & Schnug E 1998. The soil sulphur cycle. In: Sulphur in agroecosystems, ed E Schnug. Nutrients in Ecosystems. Kluwer Academic Publishers Dordrecht Netherlands pp 39-73.
38. Eriksen J & Thorup-Kristensen K 2002. The effect of catch crops on sulphate leaching and availibility of S in the succeeding crop on sandy loam soil in Denmark. Agriculture, Ecosystems and Environment 90, 247-254.
39. Eriksen J & Thorup-Kristensen K 2003. The effect of catch crops on sulphate leaching and availability of S in the succeeding crop. In: Sulfur transport and assimilation in plants. Regulation, interaction and signaling, eds JC Davidian D Grill LJ De Kok H Stulen MJ Hawkesford E Schnug & H Rennenberg, Backhuys Publishers Leiden pp 205-207.
40. Farwell SO Sherrard AE Pack ME & Adams DF 1979. Sulfur compounds volatilised from soils at different moisture contents. Soil Biology and Biochemistry 11, 411-415.
41. Ferm M 1998. Atmospheric ammonia and ammonium transport in Europe and critical loads: a review. Nutrient Cycling in Agroecosystems 51, 5-17.
42. Fillery IRP 2001. The fate of biologically fixed nitrogen in legume-based dryland farming systems: a review. Australian Journal of Experimental Agriculture 41, 361-381.
43. Foulkes MJ Sylvester-Bradley R & Scott RK 1998. Evidence for differences between winter wheat cultivars in acquisition of soil mineral nitrogen and uptake and utilisation of applied fertiliser nitrogen. Journal of Agricultural Science Cambridge 130, 29-44.
44. Freney JR 1986. Forms and reactions of organic sulfur compounds in soil. In: Sulfur in agriculture, ed MA Tabatabai, American Society of Agronomy Madison WI pp 207-232.
45. Fujita K Ofusu-Budu KG & Ogata S 1992. Biological nitrogen fixation in mixed legume-cereal cropping systems. Plant and Soil 141, 155-175.
46. Giller KE Cadisch G Ehaliotis C Adams ER Sakala WD & Mafongoya PL 1997. Building soil nitrogen capital in Africa. In: Replenishing soil fertility in Africa, eds RJ Buresh PA Sanchez & F Calhoun, Soil Science Society of America Madison WI pp 151-192.
47. Granstedt A 1995. Studies of the flow, supply and losses of nitrogen and other plant nutrients in conventional and ecological agricultural systems in Sweden. Biological Agriculture and Horticulture 11, 51-67.
48. Greaves J Hobbs P Chadwick D & Haygarth P 1999. Prospects for the recovery of phosphorus from animal manures: a review. Environmental Technology 20, 697-708.
49. Gunnarsson S & Marstorp H 2002. Carbohydrate composition of plant materials determines N mineralisation. Nutrient Cycling in Agroecosystems 62, 175-183.
50. Gustavsson J 1998. Swedish measures to reduce ammonia emissions. Nutrient Cycling in Agroecosystems 51, 81-83.
51. Handayanto E Cadisch G & Giller KE 1997. Regulating N mineralisation from plant residues by manipulation of quality. In: Driven by Nature: plant litter quality and decomposition, eds G Cadisch & KE Giller, CAB International Wallingford UK pp 175-185.
52. Harward ME & Reisenauer HM 1966. Reactions and movement of inorganic soil sulfur. Soil Science 101, 326-335.
53. Hauck RD 1986. Field measurement of denitrification - an overview. In: Field measurement of dinitrogen fixation and denitrification, eds RD Hauck & RW Weaver. Special Publication No. 18. Soil Science Society of America Madison WI pp 59-72.
54. Haynes RJ & Williams PH 1993. Nutrient cycling and soil fertility in the grazed pasture ecosystem. Advances in Agronomy 49, 119-199.
55. Heger J Mengesha S Blaha J & Koch F 1997. Estimation of minimum crude protein levels in diets for high-lean growth pigs. Agribiological Research 50, 64-77.
56. Hilhorst GJ Oenema J & van Keulen H 2001. Nitrogen management on experimental dairy farm 'De Marke'; farming system, objectives and results. Netherlands Journal of Agricultural Science 49, 135-151.
57. Høgh-Jensen H & Schjoerring JK 2001. Rhizodeposition of nitrogen by red clover, white clover and ryegrass leys. Soil Biology and Biochemistry 33, 439-448.
58. Hossain SA Dalal RC Waring SA Strong WM & Weston EJ 1996. Comparison of legume-based cropping systems at Warra, Queensland. I. Soil nitrogen and organic carbon accretion and potentially mineralisable nitrogen. Australian Journal of Soil Research 34, 273-287.
59. Huijsmans JFM Hol JMG & Bussink DW 1997. Reduction of ammonia emission by new slurry application techniques on grassland. In: Gaseous nitrogen emissions from grasslands, eds SC Jarvis & BF Pain, CAB International Wallingford UK pp 281-285.
60. Huijsmans JFM Hol JMG & Hendriks MMW 2001. Effect of application technique, manure characteristics, weather and field conditions on ammonia volatilization from manure applied to grassland. Netherlands Journal of Agricultural Science 49, 323-342.
61. Izaurralde RC McGill WB & Juma NG 1992. Nitrogen fixation efficiency, interspecies N transfer and root growth in barley-field pea intercrop on Black Chernozemic soil. Biology and Fertility of Soils 13, 11-16.
62. Janzen HH & Ellert BH 1998. Sulfur dynamics in cultivated temperate agroecosystems. In: Sulfur in the environment, ed DG Maynard, Marcel Dekker Inc. New York pp 11-43.
63. Jarvis SC & Pain B 1990. Ammonia volatilization from agricultural land. Proceedings No. 298. The Fertiliser Society London.
64. Jenkinson DS 1990. The turnover of organic carbon and nitrogen in soil. Philosophical Transactions of the Royal Society of London Series B, Biological Sciences 329, 361-368.
65. Jensen ES 1996a. Rhizodeposition of N by pea and barley and its effect on soil N dynamics. Soil Biology and Biochemistry 28, 65-71.
66. Jensen ES 1996b. Barley uptake of N deposited in the rhizosphere of associated field pea. Soil Biology and Biochemistry 28, 159-168.
67. 2 fixation and interspecific competition for inorganic N in pea-barley intercrops. Plant and Soil 182, 25-38.
68. Jensen ES 1997. The role of grain legume nitrogen fixation in the nitrogen cycling of temperate cropping systems. Risø National Laboratory Roskilde Denmark.
69. 2 fixed by white clover (Trifolium repens L.). Annals of Botany 80, 641-648.
70. Kemppainen E 1995. Leaching and uptake of nitrogen and phosphorus from cow slurry and fox manure in a lysimeter trial. Agricultural Sciences Finland 4, 363-375.
71. Kennedy IR & Islam N 2001. The current and potential contribution of asymbiotic nitrogen fixation to nitrogen requirements on farms: a review. Australian Journal of Experimental Agriculture 41, 447-457.
72. Khan DF Peoples MB Schwenke GD Felton WL Chen D & Herridge DF 2003. Effects of below-ground nitrogen on N balances of field-grown fababean, chickpea and barley. Australian Journal of Agricultural Research 54, 333-340.
73. Kirchmann H 1985. Losses, plant uptake and utilisation of manure nitrogen during a production cycle. Acta Agriculturae Scandinavica, Supplementum 24. PhD Dissertation Swedish University of Agricultural Sciences Uppsala.
74. 13N-labelled poultry manure. In: Nitrogen in organic wastes applied to soils, eds JA Hansen & K Henriksen, Academic Press London pp 113-125.
75. Kirchmann H & Bergström L 2003. Use of paper-mill waste on agricultural soils: is this a way to reduce nitrate leaching. Acta Agriculturae Scandinavica 53, 56-63.
76. Kirchmann H & Lundvall A 1993. Relationship between N immobilization and volatile fatty acids decomposition in soil after application of cattle and pig slurry. Biology and Fertility of Soils 15, 161-164.
77. 3 emission practices. Nutrient Cycling in Agroecosystems 51, 65-71.
78. Kirchmann H Pichlmayer F & Gerzabek MH 1996. Sulfur balances and sulfur-34 abundances in a long-term fertilizer experiment. Soil Science Society of America Journal 59, 174-178.
79. Kirchmann H & Witter E 1989. Ammonia volatilization during aerobic and anaerobic manure decomposition. Plant and Soil 115, 35-41.
80. Kirchmann H & Witter E 1992. Composition of fresh, aerobic and anaerobic farm animal dungs. Bioresource Technology 40, 137-142.
81. Knights JS Zhao FJ Spiro B & McGrath SP 2000. Long-term effects of land use and fertiliser treatments on sulfur cycling. Journal of Environmental Quality 29, 1867-1874.
82. Kumar K & Goh KM 2000. Crop residues and management practices: effects on soil quality, soil nitrogen dynamics, crop yield, and nitrogen recovery. Advances in Agronomy 68, 236-279.
83. Kyvsgaard P Sörensen P Möller E & Magid J 2000. Nitrogen mineralization from sheep faeces can be predicted from the apparent digestibility of the feed. Nutrient Cycling in Agroecosystems 57, 207-214.
84. Le Gouis J Beghin J Heamez E & Pluckard P 2000. Genetic differences for N uptake and utilisation efficiencies in winter wheat. European Journal of Agronomy 12, 163-173.
85. Ledgard SF 2001. Nitrogen cycling in low input legume-based agriculture, with emphasis on legume/grass pastures. Plant and Soil 228, 43-59.
86. Ledgard SF Penno JW & Sprosen MS 1999. Nitrogen inputs and losses from clover/grass pastures grazed by dairy cows, as affected by nitrogen fertiliser application. Journal of Agricultural Science Cambridge 132, 215-225.
87. Ledgard SF & Steele KW 1992. Biological nitrogen fixation in mixed legume/grass pastures. Plant and Soil 141, 137-153.
88. Lewan E 1994. Effects of a catch crop on leaching of nitrogen from a sandy soil: simulations and measurements. Plant and Soil 166, 137-152.
89. Lloyd A 1994. Effectiveness of cattle slurry as a sulphur source for grass cut for silage. Grass and Forage Science 49, 203-208.
90. Lord EI & Mitchell RDJ 1998. Effect of nitrogen inputs to cereals on nitrogen leaching from sandy soils. Soil Use and Management 14, 78-83.
91. Lorenz F & Steffens G 1997. Effect of application techniques on ammonia losses and herbage yield following slurry application to grassland. In: Gaseous nitrogen emissions from grasslands, eds SC Jarvis & BF Pain, CAB International Wallingford UK pp 287-292.
92. Martinez J & Guiraud G 1990. A lysimeter study of the effects of a rye-grass catch crop, during a winter wheat/maize rotation, on nitrate leaching and on the following crop. Journal of Soil Science 41, 5-16.
93. 15N in situ stem labelling method. Soil Biology and Biochemistry 35, 21-28.
94. McGrath SP Zhao FJ & Blake-Kalff MMA 2002. History and outlook for sulphur fertilisers in Europe. Proceedings No. 497. International Fertiliser Society York UK 24 pp.
95. 15N labelling to estimate the total below-ground nitrogen of pasture legumes in intact soil-plant systems. Australian Journal of Agricultural Research 48, 295-304.
96. Meisinger JJ Hargrove WL Mikkelsen RL Williams JR & Benson VW 1991. Effects of cover crops on groundwater quality. In: Cover crops for clean water, ed WL Hargrove, Soil and Water Conservation Society Ankeny IA pp 57-68.
97. Menzi H Katz P Frick P Fahrni M & Keller M 1997. Ammonia emissions following the application of solid manure to grassland. In: Gaseous nitrogen emissions from grasslands, eds SC Jarvis & BF Pain, CAB International Wallingford UK pp 265-274.
98. Metson AJ 1979. Sulphur in New Zealand soils 1. New Zealand Journal of Agricultural Research 22, 95-114.
99. Misselbrook TH Van der Weerden TJ Pain BF Jarvis SC Chambers BJ Smith KA Phillips VR & Demmers TGM 2000. Ammonia emission factors for UK agriculture. Atmospheric Environment 34, 871-880.
100. Musvoto C Campbell BM & Kirchmann H 2000. Decomposition and nutrient release from mango and miombo woodland litter in Zimbabwe. Soil Biology and Biochemistry 32, 1111-1119.
101. Myers RJK Palm CA Cuevas E Gunatilleke IUN & Brossard M 1994. The synchronisation of mineralisation and plant nutrient demand. In: The biological management of tropical soil fertility, eds PL Woomer & MJ Swift, John Wiley & Sons Chichester UK pp 81-116.
102. Myers RJK Van Noordwijk M & Vityakon P 1997. Synchrony of Nutrient Release and Plant Demand: Plant Litter Quality, Soil Environment and Farmer Management Options. In: Driven by Nature: plant litter quality and decomposition, eds G Cadisch & K Giller, CAB International Wallingford UK pp 215-229.
103. National Research Council 1989. Alternative agriculture. National Academy Press Washington DC.
104. Nieder R Schollmeyer G & Richter J 1989. Denitrification in the rooting zone of cropped soils with regard to methodology and climate: a review. Biology and Fertility of Soils 8, 219-226.
105. NILU 2003. Available: http://www.nilu.no/projects/ccc/emepdata.html [November 2003]. Norwegian Institute for Air Research.
106. Nygaard Sørensen J 1991. Effect of catch crops on the content of soil mineral nitrogen before and after winter leaching. Zeitschrift für Pflanzenernährung und Bodenkunde 155, 61-66.
107. Pain BF & Misselbrook TH 1997. Sources of variation in ammonia emission factors for manure applications to grassland. In: Gaseous nitrogen emissions from grasslands, eds SC Jarvis & BF Pain, CAB International Wallingford UK pp 293-301.
108. 2 fixation by vetch and pea grown in pure stand or in mixes with oat. Plant and Soil 107, 183-188.
109. Papastylianou I 1999. Estimation of nitrogen fixed by legumes in long-term vs short-term cropping systems. Agronomy Journal 91, 329-334.
110. Parton WJ Woomer PL & Martin A 1994. Modelling soil organic matter dynamics and plant productivity in tropical ecosystems. In: The biological management of tropical soil fertility, eds PL Woomer & MJ Swift, Wiley-Sayce New York pp 171-188.
111. Paynel F Murray PJ & Cliquet JB 2001. Root exudates: a pathway for short-term N transfer from clover and ryegrass. Plant and Soil 229, 235-243.
112. Peoples MB & Baldock JA 2001. Nitrogen dynamics of pastures: nitrogen fixation inputs, the impact of legumes on soil nitrogen fertility, and the contributions of fixed nitrogen to Australian farming systems. Australian Journal of Experimental Agriculture 41, 327-346.
113. Peoples MB Herridge DF & Ladha JK 1995. Biological nitrogen fixation: an efficient source of nitrogen for sustainable agricultural production? Plant and Soil 174, 3-28.
114. Rahn CR Bending GD Turner MK & Lillywhite RD 2003. Management of N mineralisation from crop residues of high N content using amendment materials of varying quality. Soil Use and Management 19, 193-200.
115. Reddy KS Singh M Swarup A Rao AS & Sing KN 2002. Sulfur mineralisation in two soils amended with organic manures, crop residues, and green manures. Journal of Plant Nutrition and Soil Science 165, 167-171.
116. Ridley AM White RE Helyar KA Morrison GR Heng LK & Fisher R 2001. Nitrate leaching loss under annual and perennial pastures with and without lime on a duplex (texture contrast) soil in humid southeastern Australia. European Journal of Soil Science 52, 237-252.
117. Rochester IJ Peoples MB Constable GA & Gault RR 1998. Faba beans and other legumes add nitrogen to irrigated cotton cropping systems. Australian Journal of Experimental Agriculture 38, 253-260.
118. Russell CA & Fillery IRP 1996. Estimates of lupin below-ground biomass nitrogen, dry matter, and nitrogen turnover to wheat. Australian Journal of Agricultural Research 47, 1047-1059.
119. Ruz-Jerez BE White RE & Ball PR 1995. A comparion of nitrate leaching under clover-based pastures and nitrogen-fertilized grass grazed by sheep. Journal of Agricultural Science Cambridge 125, 361-369.
120. Sawatsky N & Soper RJ 1991. A quantitative measurement of the nitrogen loss from the root system of field peas (Pisum avense L.) grown in the soil. Soil Biology and Biochemistry 23, 255-259.
121. Scherer HW 2001. Sulphur in crop production. European Journal of Agronomy 14, 81-111.
122. Schuiling RD & Andrade A 1999. Recovery of struvite from calf manure. Environmental Technology 20, 765-768.
123. Schwenke GD Peoples MB Turner GL & Herridge DF 1998. Does nitrogen fixation of commercial, dryland chickpea and faba bean crops in north-west New South Wales maintain or enhance soil nitrogen? Australian Journal of Experimental Agriculture 38, 61-70.
124. Shepherd MA 1999. The effectiveness of cover crops during eight years of a UK sandland rotation. Soil Use and Management 15, 41-48.
125. Shepherd MA & Bennett G 1998. Nutrient leaching losses from a sandy soil in lysimeters. Communications in Soil Science and Plant Analysis 29, 931-946.
126. Smith KA & Chambers BJ 1995. Muck: from waste to resource. Utilisation: the impacts and implications. Proceedings of the MUCK '95 Conference. Agricultural Engineer, Summer 1995.
127. Sommer SG & Olesen JE 1991. Effects of dry matter content and temperature on ammonia loss from surface applied cattle slurry. Journal of Environmental Quality 20, 679-683.
128. 2 fixation: a link between carbon and nitrogen cycles in grassland ecosystems. Plant and Soil 187, 321-332.
129. Steineck S Gustafson G Andersson A Tersmeden M & Bergström J 1999. Stallgödselns innehåll av växtnäring och spårelement. Swedish Environmental Protection Agency, Report 4974, Stockholm Sweden.
130. Stockdale EA Lampkin NH Hovi M Keatinge R Lennartsson EKM MacDonald DW Padel S Tattersall FH Wolfe MS & Watson CA 2001. Agronomic and environmental implications of organic farming systems. Advances in Agronomy 70, 261-327.
131. Stopes C Lord EI Phillips L & Woodward L 2002. Nitrate leaching from organic farms and conventional farms following best practice. Soil Use and Management 18, 256-263.
132. Tabatabai MA & Chae YM 1991. Mineralization of sulfur in soils amended with organic wastes. Journal of Environmental Quality 20, 684-690.
133. Thomsen IK Hansen JF Kjellerup V & Christensen BT 1997. Effects of cropping system and rates of nitrogen in animal slurry and mineral fertilizer on nitrate leaching from a sandy loam. Soil Use and Management 9, 53-58.
134. Till R 2002. Sulphur fertilisers, forage quality and animal production. Proceedings No. 501. International Fertiliser Society York UK 27 pp.
135. Ulyatt MJ Thomson DJ Beever DE Evans RT & Haines M 1988. The digestion of perennial ryegrass (Lolium perenne cv Melle) and white clover (Trifolium repens cv Blanca) by grazing cattle. British Journal of Nutrition 60, 137-149.
136. 2 fixation by annual legumes. Field Crops Research 65, 211-228.
137. Unkovich MJ Pate JS & Sanford P 1997. Nitrogen fixation by annual legumes in Australian Mediterranean agriculture. Australian Journal of Agricultural Research 48, 267-293.
138. Van Kessel C & Hartley C 2000. Agricultural management of grain legumes: has it led to an increase in nitrogen fixation? Field Crops Research 65, 165-181.
139. Velthof GL Kuikman PJ & Oenema O 2002. Nitrous oxide emission from soils amended with crop residues. Nutrient Cycling in Agroecosystems 62, 249-261.
140. Vinten AJA Castle K & Arah JRM 1996. Field evaluation of models of denitrification linked to nitrate leaching for aggregated soil. European Journal of Soil Science 47, 305-317.
141. 2 fixation in grass-clover mixtures of a grazed organic cropping system using two N-15 methods. Agriculture Ecosystems and Environment 78, 139-147.
142. Watson CA Atkinson D Gosling P Jackson LR & Rayns FW 2002. Managing soil fertility in organic farming systems. Soil Use and Management 18, 239-247.
143. Walker K & Dawson C 2002. Sulphur fertiliser recommendations in Europe. Proceedings No. 504. International Fertiliser Society York UK 12 pp.
144. Waterer JG Vessey JK Stobbe EH & Soper RJ 1994. Yield and symbiotic nitrogen fixation in a pea-mustard intercrop as influenced by N fertiliser additions. Soil Biology and Biochemistry 26, 447-453.
145. Webster CP & Goulding KWT 1989. Influence of soil carbon content on denitrification from fallow land during autumn. Journal of the Science of Food and Agriculture 49, 131-142.
146. Weier KL Doran JW Power JF & Walters DT 1993. Denitrification and the dinitrogen/nitrous oxide ratio as affected by soil water, available carbon, and nitrate. Soil Science Society of America Journal 57, 66-72.
147. White PF Nersoyan NK & Christiansen S 1994. Nitrogen cycling in a semi-arid Mediterranean region: changes in soil N and organic matter under several crop/livestock production systems. Australian Journal of Agricultural Research 45, 1293-1307.
148. Whitehead DC 2000. Nutrient elements in grassland: soil-plant-animal relationships. CAB International Wallingford UK.
149. Yan X Akimoto H & O'Hara T 2003. Estimation of nitrous oxide, nitric oxide and ammonia emissions from croplands in East, Southeast and South Asia. Global Change Biology 9, 1080-1096.
150. Zhao FJ McGrath SP Blake-Kalff MMA Link A & Tucker M 2002 Crop responses to sulphur fertilisation in Europe. Proceedings No. 504, International Fertiliser Society York UK 27 pp.