Reduced tillage protects earthworms | Un travail du sol réduit protège les vers de terre
2011
Jossi, W. | Zihlmann, U. | Anken, Th. | Dorn, B. | Van der Heijden, M., Forschungsanstalt Agroscope Reckenholz-Taenikon ART, Zuerich (Switzerland) | Tschachtli, R.
Earthworm activity improves soil fertility. In arable crop rotations highest earthworm populations are usually found in leys. The impact of tillage system and tillage intensity on earthworm populations was studied in the two long term trials at Burgrain (Albertswil LU) and at Hausweid (Aadorf TG). [...]In contrast, at Hausweid having a four years crop rotation at Hausweid without ley, earthworm populations differed significantly depending on tillage system and tillage intensity after 21 years of the trial. Earthworm biomass reached 330 g per m² in the permanent grassland adjacent to the trial whereas it was reduced by 50 % in the no-till and even by 80 % in the ploughed plots. Additionally, average earthworm species diversity in permanent grassland and no-till was 30 % higher than in ploughed tillage system. These findings confirm the positive impact of no-till on the increase of earthworm populations and species diversity.
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