Knudsen, Marie Trydeman; Kristensen, Ib Sillebak; Berntsen, Jørgen; Petersen, Bjørn Molt and Kristensen, Erik Steen (2006) Estimated N leaching losses for organic and conventional farming in Denmark. Journal of Agricultural Science, 144 (2), pp. 135-149.
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The impact of organic compared to conventional farming practices on N leaching loss was studied for Danish mixed dairy and arable farms using an N balance approach based on representative data. On mixed dairy farms a simple N balance method was used to estimate N surplus and N leaching loss. On arable farms the simple N balance method was unreliable due to changes in the soil N pool. Consequently, the FASSET simulation model was used to estimate N surplus, N leaching loss and the changes in the soil N pool.
The study found a lower N leaching loss from organic than conventional mixed dairy farms, primarily due to lower N inputs. On organic arable farms the soil N pool was increasing over years but the N leaching loss was comparable to conventional arable farms. The soil N pool was primarily increased by organic farming practices and incorporation of straw. The highest increase in the soil N pool was seen on soils with a low level of soil organic matter. The level of N leaching loss was dependent on soil type, the use of catch crops and the level of soil organic matter, whereas incorporation of straw had a minor effect. N leaching was highest on sandy soils with a high level of soil organic matter and no catch crops. The study stresses the importance of using representative data of organic and conventional farming practices in comparative studies of N leaching loss.
|EPrint Type:||Journal paper|
|Keywords:||nitrogen, leaching, conventional, organic, agriculture|
|Subjects:|| Soil > Nutrient turnover|
Environmental aspects > Air and water emissions
|Research affiliation:|| Denmark > DARCOF II (2000-2005) > V.1 (SYNERGY) Coordination and synergy|
Denmark > DARCOF II (2000-2005) > I. 3 (BIOMOD) Interaction between nitrogen dynamics, crop production and biodiversity
|Deposited By:||Knudsen, Postdoc Marie Trydeman|
|Deposited On:||30 Mar 2005|
|Last Modified:||28 Apr 2013 17:59|
|Refereed:||Peer-reviewed and accepted|
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