10622: Residual effect and nitrate leaching in mixed crop rotations differing in grassland type, frequency and fertilizer history

Eriksen, J. and Askegaard, M. (2007) Residual effect and nitrate leaching in mixed crop rotations differing in grassland type, frequency and fertilizer history. Working Paper.

Summary

The experimental area in Foulum for investigating residual effects of grassland hosts this part of the project. Over the last 9 years, three crop rotations have been build up with different frequency of grazed grassland (Table 1) including both unfertilised grass-clover and fertilised pure ryegrass. In 2003 we re-established grass-clover and ryegrass in all rotations for grazing in 2004. In 2005 grasslands similar managed during the last three years (2002-2004) but with widely different grassland frequency in the rotation have been ploughed out. In these crop rotations during 1997-2004 grazed grassland has been present 2, 3 and 6 times equivalent to 25, 38 and 75% of the crop rotation. Thus, the long-term effect of composition and frequency of grasslands can be studied in a block design with four replicates.

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