Abstract
Measurements of net mineralization using a field incubation method were made over a full growing season (180 d). Soil cores, taken from cut swards which for many years had been previously grazed by cattle, were placed in jars in the field for successive incubation periods of 14 d. Acetylene was added to the incubation jars to inhibit nitrification in the soil cores and thereby prevent losses of N through denitrification. Net mineralization over 180 d amounted to 415, 321 and 310 kg N ha−1 under grass/clover, unfertilized grass and grass receiving 420 kg N ha−1 y−1, respectively. At the start of the growing season, an index of potentially mineralizable N in the soil was estimated by a chemical extraction method, but this index was <50% of the estimates obtained by field incubation. The amount of N in herbage harvested regularly from the swards also under-estimated the supply of N from the soil, with apparent recoveries of 53, 82 and 74% and total yields of N of 240, 263 and 538 (kg N ha−1) from grass/clover, unfertilized grass and fertilized grass, respectively. Mineralization rates varied significantly with seasonal soil temperature fluctuations, but the incubation method was apparently less sensitive in relation to changes in soil water content. Rates of N-turnover (as % of total soil N) were highest under grass/clover (9%), but similar under fertilized and unfertilized grass swards (approximately 5%).
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References
Ball R P 1982 Nitrogen balance in intensively managed pasture systems. In Nitrogen Balance in New Zealand Ecosystems. Ed. P W Gandar. pp 47–66. DSIR, Palmerston North, New Zealand.
Ball R P and Ryden J C 1984 Nitrogen relationships in intensively managed temperate grasslands. Plant and Soil 76, 23–33.
Barraclough D and Jarvis S C 1989 The responsible management of nitrogen in grassland. In Environmentally Responsible Grassland Management. pp 2.1–2.14. Proceedings of British Grassland Society (Winter Meeting, 1989).
Bartholomew W V 1965 Mineralization and immobilization of nitrogen in the decomposition of plant and animal residues. In Soil Nitrogen. Eds. W V Bartholomew and F E Clark. pp 285–306. Agronomy 10, Am. Soc. Agron. Madison, WI.
Bremner J M 1965 Organic nitrogen in soils. In Soil Nitrogen. Eds. W V Bartholomew and F E Clark. pp 93–149. Agronomy 10, Am. Soc. Agron. Madison, WI.
Bristow A W and Jarvis S C 1991 Effects of grazing and nitrogen fertilizer on the soil microbial biomass under permanent pasture. J. Sci. Food Agric. 54, 9–21.
Bristow A W, Ryden J C and Whitehead D C 1987 The fate at several time intervals of 15N-labelled ammonium nitrate applied to an established grass sward. J. Soil Sci. 38, 245–254.
Hardy R W F, Burns R C and Holsten R O 1973 Applications of the acetylene-ethylene assay for measurement of nitrogen fixation. Soil Biol. Biochem. 5, 47–81.
Hassink J, Scholefield D and Blantern P 1990 Nitrogen mineralization in grassland soils. Proceedings of 13th General Meeting of European Grassland Federation (Czechoslovakia). Eds. N Gárborcik, V Krajcovic and M Zimková. Vol. 2. pp 25–32. The Grassland Research Institute, Banská, Bystrica.
Hatch D J, Jarvis S C and Philipps L 1990 Field measurement of nitrogen mineralization using soil core incubation and acetylene inhibition of nitrification. Plant and Soil 124, 97–107.
Haynes R J 1986 Mineral Nitrogen in the Plant-Soil System (Physiological Ecology). pp 52–126. Academic Press, London.
Jackson L E, Schimel J P and Firestone M K 1989 Short-term partitioning of ammonium and nitrate between plants and microbes in an annual grassland. Soil Biol. Biochem. 21, 409–415.
Jansson S L and Persson J 1982 Mineralization and immobilization of soil nitrogen. In Nitrogen in Agricultural Soils. Ed. F J Stevenson. pp 229–252. Agronomy 22, Am. Soc. Agron., Madison, WI.
Jenkinson D S 1988 Soil organic matter and its dynamics. In Russell's Soil Conditions and Plant Growth. Ed. A Wild. pp 564–607. Longman Scientific and Technical, Harlow, Essex.
Macduff J H and White R E 1985 Net mineralization and nitrification rates in a clay soil measured and predicted in permanent grassland from soil temperature and moisture content. Plant and Soil 86, 151–172.
Macduff J H, Jarvis S C and Roberts D H 1990 Nitrate leaching under grazed grassland: measurements using ceramic cup soil solution samplers. In Fertilization and the Environment. Eds. R Merckx, H Vereecken and K Vlassak. pp 72–78. Leuven University Press, Leuven.
Mannetje L't and Jarvis S C 1990 Nitrogen flows and losses in grasslands. In Soil-Grassland-Animal Relationships. Proceedings of 13th General Meeting of European Grassland Federation (Czechoslovakia). Eds. N Gáborcik, V Krajcovic and M Zimková. Vol. 1. pp 114–131. The Grassland Research Institute, Banská, Bystrica.
Meer H Gvan der 1982 Effective use of nitrogen in grassland farms. In Efficient Grassland Farming. Proceedings of 9th General Meeting of European Grassland Federation (Reading). Ed. A J Corrall. pp 61–68. The British Grassland Society. Hurley.
Meer H Gvan der and van Uum-van Lohuyzen M G 1986 The relationship between inputs and outputs of nitrogen in intensive grassland systems. In Nitrogen Fluxes in Intensive Grassland Systems. Eds. H Gvan der Meer, J C Ryden and G C Ennik. pp 1–18. Martinus Nijhoff Publishers, Dordrecht, The Netherlands.
Minchin F R, Witty J F, Sheehy J E and Muller M 1983 A major error in the acetylene reduction assay: Decreases in nodular nitrogenase activity under assay conditions. J. Exp. Bot. 34, 641–649.
Morrison J, Jackson M V and Sparrow P E 1980 The response of perennial ryegrass to fertilizer nitrogen in relation to climate and soil: Report of the joint ADAS/GRI grassland manuring trial-GM 20. Grassland Research Institute Technical Report No. 27. The Grassland Research Institute, Hurley, UK.
Parkin T B and Tiedje J M 1984 Application of a soil core method to investigate the effect of oxygen concentration on denitrification. Soil Biol. Biochem. 16, 331–334.
Parsons A J, Orr R J, Penning P D and Lockyer D R 1991 Uptake, cycling and fate of nitrogen in grass-clover swards continuously grazed by sheep. J. Agric. Sci. Camb. 116, 47–61.
Richards I R and Hobson R D 1977 The relationship between nitrogen supply and the nitrogen yield of cut grass swards. J. Agric. Sci. (Camb.) 88, 289–292.
Skjemstad J O, Vallis I and Myers R J K 1987 Decomposition of soil organic nitrogen. In Advances in Nitrogen Cycling in Agricultural Ecosystems. Ed. J R Wilson. pp 134–144. Proceedings of the Symposium held in Brisbane, Australia. C.A.B. International, Wallingford.
Stevenson F J 1982 Organic forms of soil nitrogen. In Nitrogen in Agricultural Soils. Ed. F J Stevenson. pp 67–122. Agronomy 22, Am. Soc. Agron. Madison, WI.
Tyson K C, Roberts D H, Clement C R and Garwood E A 1990 Comparison of crop yields and soil conditions during 30 years under annual tillage or grazed pasture. J. Agric. Sci. Camb. 115, 29–40.
Whitehead D C 1981 An improved chemical extraction method for predicting the supply of available soil nitrogen. J. Sci. Food Agric. 32, 359–365.
Whitehead D C 1986 Sources and transformations of organic nitrogen in intensively managed grassland soils. In Nitrogen Fluxes in Intensive Grassland Systems. Eds. H Gvan der Meer, J C Ryden and G C Ennik. pp 47–58. Martinus Nijhoff Publishers, Dordrecht, The Netherlands.
Whitehead D C, Pain B F and Ryden J C 1986 Nitrogen in UK grassland agriculture. J. Royal Agric. Soc. 147, 190–201.
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Hatch, D.J., Jarvis, S.C. & Reynolds, S.E. An assessment of the contribution of net mineralization to N cycling in grass swards using a field incubation method. Plant Soil 138, 23–32 (1991). https://doi.org/10.1007/BF00011804
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DOI: https://doi.org/10.1007/BF00011804