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Ammonia release and nitrogen balances on south Swedish dairy farms 1997-1999

Swensson, Christian (2002). Ammonia release and nitrogen balances on south Swedish dairy farms 1997-1999. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Agraria, 1401-6249 ; 333
ISBN 91-576-6176-6
[Doctoral thesis]

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The thesis summerisees and discusses studies concerning factors influencing ammonia release in cow houses and factors influencing nitrogen surplus and nitrogen efficiency on dairy farms. The first investigation was carried out at the Animal Experimental Station at Anarp. The aims were to investigate if a lower content of crude protein in the diet for higli-yielding dairy cows will decrease the ammonia release from manure. The ammonia release was significantly decreased for cows fed with lower protein levels compared with high protein diets. The effects of manure-handling system, type of cow houses and feeding of dairy cows on ammonia release were studied in a field investigation. Results demonstrated a higher release of ammonia in free stall barns with liquid manure handling systems compared with tie stall barns with solid manure handling systems. There was a higher ammonia release from cow diets with a higher content of crude protein. A theoretical calculation or the nitrogen efficiency and nitrogen surplus at cow level and farm level was carried out. The assumptions for the calculations were for a farm located in central Skåne (south Sweden) with 50 dairy cows arid 50 hectares of arable land. The nitrogen efficiency at farm level was 28% on an average. Nitrogen surplus per hectare varied between 135 - 145 kg when the intensity was 8600 kg milk/ha. Nitrogen balances from conventional dairy farms situated in southern Sweden were investigated using the farm gate method. Neither nitrogen surplus per hectare nor nitrogen efficiency showed significant effects of the manure-handling system. The results showed that nitrogen efficiency was significantly improved by including sugar beet in the crop rotation and was negatively correlated with milk yield per hectare and nitrogen fertiliser per hectare. Analysis of dairy farms with balances from three consecutive years 1997, 1998 and 1999 showed that these dairy farms decreased their nitrogen surplus by 25 kg N/ha between 1997 and 1998. This decrease was not repeated in the following year. Input of N from artificial fertiliser decreased significantly from the first year.

Authors/Creators:Swensson, Christian
Title:Ammonia release and nitrogen balances on south Swedish dairy farms 1997-1999
Series Name/Journal:Acta Universitatis Agriculturae Sueciae. Agraria
Year of publishing :January 2002
Number of Pages:68
ALLI . Frank, B. & Swensson, C. 2002. Relationship between Content of Crude Protein in Rations for Dairy Cows and Milk Yield, Concentration of Urea in Milk and Ammonia Emissions. Accepted for publication in the Journal of Dairy Science. II. Swensson, C. & Gustafsson, G. 2002. Characterisation of influence of manure handling system and feeding on the level of ammonia release using a simple method in cow houses. Acta Agriculturae Scandinavica, Section A. Animal Science 52: 49-56, III. Swensson, C. & Lidström, E-M. 2002. What is a realistic target of nitrogen outflow from a dairy farm in southern Sweden? Manuscript. IV. Swensson, C. 2002. Effect of manure handling system? N fertiliser use and area of sugar beet on nitrogen surpluses from dairy farms in southern Sweden. Will be accepted for publication in the Journal of Agricultural Science, Cambridge. V. Swensson, C. 2002. Analyses of mineral balances between 1997 - 1999 from dairy farms in the south of Sweden. Submitted.
Place of Publication:Uppsala
ISBN for printed version:91-576-6176-6
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:T Pollution > T01 Pollution
L Animal production > L01 Animal husbandry
Subjects:Not in use, please see Agris categories
Agrovoc terms:ammonia, waste gases, air pollution, pollution by agriculture, dairy farms, farmyard manure, cattle sheds, sweden
Keywords:farm gate balances, environment, ammonia emission, milk production, manure handling system, cow houses, crude protein
Permanent URL:
ID Code:111
Department:(LTJ, LTV) > Institutionen för jordbrukets biosystem och teknologi
Deposited On:08 Jan 2003 00:00
Metadata Last Modified:02 Dec 2014 10:01

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