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Providing evidence to improve practice

Individual study: Botanical development of restored species rich field margins

Published source details

Jacot K., Eggenschwiler L. & Bosshard A. (2005) Botanical development of restored species rich field margins. Agrarforschung, 12, 10-15

This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Plant nectar flower mixture/wildflower strips Farmland Conservation

A replicated study from 2001 to 2004 in Switzerland (Jacot et al. 2005) showed that both seed composition of wildflower mixtures and micro-climatic conditions influenced the emerging plant community in sown wildflower strips. The number of plant species established from sown mixtures was relatively high (around 25 species/25 m2) in dry to moist sites, whereas fewer species (around 15 species/25 m2) established on wet or shady sites. Seed mixtures containing high proportions (>75%) of grasses often resulted in grass-dominated margins. Problematic weed species established but did not dominate any strip community. No clear effects of cutting could be shown during the four study years. Eighty wildflower strips on 35 farms were studied. The strips were hand-sown in April and May 2001 with four types of seed mixture, each mixture adapted to the micro-climatic conditions at the site: mixture with legumes, mixture without legumes, grass component of 75%, grass component of 90%. Additional strips were established in 2003 using seed mixtures with 20% or 40% grasses. Strips were cut once, twice or not at all in their first year, and annually in August from their second year onwards. Cuttings were removed. Half the strip was left uncut. Vegetation was surveyed annually in June from the second year after establishment.