Sow seeds in prepared gaps within vegetation

How is the evidence assessed?
  • Effectiveness
    not assessed
  • Certainty
    not assessed
  • Harms
    not assessed

Study locations

Key messages

  • One study examined the effects of sowing seeds in prepared gaps within vegetation on grasslands. The study was in Hungary.



  • Sown/planted species abundance (1 study): One replicated study in Hungary found that sowing seeds in large gaps within vegetation led to a greater cover of sown target plant species than sowing in smaller gaps.


About key messages

Key messages provide a descriptive index to studies we have found that test this intervention.

Studies are not directly comparable or of equal value. When making decisions based on this evidence, you should consider factors such as study size, study design, reported metrics and relevance of the study to your situation, rather than simply counting the number of studies that support a particular interpretation.

Supporting evidence from individual studies

  1. A replicated study in 2013–2015 in eight species-poor grassland sites in east Hungary (Valkó et al. 2016) found that sowing seeds in large gaps created in grassland led to a greater cover of sown target plant species than sowing in smaller gaps but the cover of weeds was similar. During the first two years after sowing, the average cover of target plant species was higher when seeds were sown in large gaps (4 x 4 m: 52–59%) than in smaller gaps (1 x 1 m: 27–31%; 2 x 2 m: 16–39%). The cover of weed species did not differ significantly between the three gap sizes (1 x 1 m: 19–26%; 2 x 2 m: 16–29%; 4 x 4 m: 19%). In October 2013, gaps of three sizes (1 x 1 m, 2 x 2 m, 4 x 4 m) were created >50 m apart within existing grassland at each of eight sites. All sites were former arable fields sown with a low diversity grass seed mix in October 2005. Gaps were prepared by digging, rotary hoeing and raking the soil. All gaps were sown with a seed mixture of 35 native grassland species at a rate of 10 g/m2 and grazed by cattle in April–October each year. Vegetation cover was recorded in each of the 24 gaps in June 2014 and 2015.

    Study and other actions tested
Please cite as:

Martin, P.A., Ockendon, N., Berthinussen, A, Smith, R.K. and Sutherland W.J. (2021) Grassland Conservation: Global evidence for the effects of selected interventions. Conservation Evidence Series Synopses. University of Cambridge, Cambridge, UK.

Where has this evidence come from?

List of journals searched by synopsis

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Grassland Conservation

This Action forms part of the Action Synopsis:

Grassland Conservation
Grassland Conservation

Grassland Conservation - Published 2021

Grassland Synopsis

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