Seuri, Pentti and Kuisma, Miia (2006) Water discharge and nutrient leaching from organic mixed crop rotation. In: Tamm, Toomas and Pietola, Liisa (Eds.) NJF Report, Nordic Association of Agricultural Scientists, 2 (5), pp. 41-46.
Water discharge and nutrient leaching studies were conducted in an experimental field under organic farming practice for 20 years. The water discharge measurements cover five years out of a six-year crop rotation. The water discharge for the whole year was 1520 m³/ha (=152 mm). More than 2/3 of the total discharge occurred in April-May. The total precipitation for the whole year was 680 mm.
The total amount of N in the drainage runoff was 11.5 kg/ha and the flow-weighted average content 7.5 mg/l. The total amount of P in the drainage runoff was 48 g/ha and the flow-weighted average content 0.031 mg/l. 85 % of the total P was dissolved reactive phosphorus (DPR).
Some preliminary correlation between N leaching and N management was observed, i.e. higher N concentrations in drainage water were found on green fallow after autumn ploughing compared to first-year grass or spring cereal. Variation in the P concentration of the drainage water between the plots seems to be correlated to soil P status rather than P management.
|EPrint Type:||Conference paper, poster, etc.|
|Type of presentation:||Paper|
|Keywords:||water discharge, leaching, nitrogen, phosphorus, organic farming|
|Subjects:||Environmental aspects > Air and water emissions|
|Research affiliation:||Finland > Luke Natural Resources Institute > Ecological Production|
|Deposited By:||Koistinen, Riitta|
|Deposited On:||26 Jul 2006|
|Last Modified:||12 Apr 2010 07:33|
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