Title: Nitrogen transport via surface and subsurface flow in an agricultural field
Abstract:Nitrogen in runoff waters and in soil was monitored in a clay field, in southern Finland. Subsurface drainage accounted for 51% of the total runoff (439 mm) and 79% of the total N losses (30 kg ha -1 ...Nitrogen in runoff waters and in soil was monitored in a clay field, in southern Finland. Subsurface drainage accounted for 51% of the total runoff (439 mm) and 79% of the total N losses (30 kg ha -1 ) in June 1994-December 1996. Nitrate nitrogen (NO 3 -N) formed 32-96% of the total N load. NO 3 -N in the subsurface drainage water rapidly increased from 2 to 60 mg l -1 after the sequence of fertilization and rainfalls. NO 3 -N in the soil water indicated prominent preferential flow from the top layer into the tile drains. Total N in the runoff waters remained below 5 mg l -1 during the snowmelt and below 10 mg l -1 in the autumn. In these seasons, the determining factor in N transport was the high water volumes of surface runoff and subsurface drainage. The preferential flow paths are likely caused by both macropores and the backfilled trenches above the tile drains.Read More
Publication Year: 1999
Publication Date: 1999-01-01
Language: en
Type: article
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Cited By Count: 13
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