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Nitrate leaching from an organic dairy crop rotation: the effect of manure type, N-input and improved crop rotation

Eriksen, J.; Askegaard, M. and Kristensen, K. (2004) Nitrate leaching from an organic dairy crop rotation: the effect of manure type, N-input and improved crop rotation. Soil Use and Management, 20, pp. 48-54.

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Summary

Four management systems combining high and low livestock densities (0.7 and 1.4 LU ha-1) and different types of organic manure (slurry and straw based FYM) were applied to an organic dairy crop rotation (barley [undersown] – grass-clover – grass-clover – barley/pea – oats – fodder beet) between 1998 and 2001. The effects of the management systems on crop yields and nitrate leaching were measured. In all four years nitrate leaching, as determined using ceramic suction cups, was higher in the three crops following ploughing of grass-clover than under the barley or grass-clover. Overall, no significant differences in nitrate leaching were observed between the management systems. However, the replacement of the winter wheat crop used in the earlier experimental period (1994-97) by spring oats with catch crops in both the preceding and succeeding winters reduced nitrate leaching compared to the earlier rotation. Increasing the livestock density, which increased manure application by c. 60 kg total N ha-1 increased crop yields by 7 and 9% on average for FYM and slurry, respectively. Yields were 3-5% lower where FYM was used instead of slurry. The experiment confirmed the overriding importance of grassland N management, particularly the cultivation of the ley, in organic dairy crop rotations.


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) > IV.1 (EXUNIT) Experimental units for research in organic farming systems
Denmark > DARCOF II (2000-2005) > I.15 (NIT_GRASS) Nitrate leaching from dairy farming
Deposited By: Eriksen, Senior scientist Jørgen
ID Code:1824
Deposited On:31 Oct 2003
Last Modified:12 Apr 2010 07:28
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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