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Residual nitrogen effect of a dairy crop rotation as influenced by grass ley management manure type and age

Hansen, J.P.; Eriksen, J. and Jensen, L.S. (2005) Residual nitrogen effect of a dairy crop rotation as influenced by grass ley management manure type and age. Soil Use and Management (21), pp. 278-286.

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Forecasting crop nitrogen (N) demand is important for maximising productivity and minimising losses to the environment and includes taking into account residual effects. The residual N effect was estimated in a dairy crop rotation (spring barley undersown with grass-clover, 1st and 2nd year ley, spring barley/pea undersown with ryegrass, oats undersown with ryegrass and fodder beets) with different management (grazed/cut) and manure type (slurry/deep litter) by anaerobic incubation and plant N-uptake in a pot experiment and in the field. For comparison a 10-year-old grass-clover was included. Type of animal manure did not affect the residual N effect. Crop rotations with grazed grassland had a residual effect that on average was 13% higher than the same rotation without grazing. Ploughing of grasslands clearly increased residual N effects for several years, but grassland age at ploughing was of little importance. Thus, the residual effect of 10-year-old grass-clover ley only marginally exceeded that of undersown grass-clover despite considerable difference in estimated accumulated N-surplus. The results indicate that organic N is easier to mineralise the more recently it has been formed. Good correlations existed between soil inorganic N in the spring, N released during anaerobic incubation and plant-available N but chemical measures may be difficult to implement in practical farming due to difficulty in representative sampling in systems characterised by huge spatial variability.

EPrint Type:Journal paper
Subjects: Soil > Nutrient turnover
Research affiliation: Denmark > DARCOF II (2000-2005) > I. 4 (NIMAB) Enhanced bread wheat production
Denmark > DARCOF II (2000-2005) > I.15 (NIT_GRASS) Nitrate leaching from dairy farming
Deposited By: Eriksen, Professor Jørgen
ID Code:4572
Deposited On:23 Mar 2005
Last Modified:12 Apr 2010 07:30
Document Language:English
Refereed:Peer-reviewed and accepted

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