Elimination of long-term ruderalisation in pasture ecosystem
1999
Novak, J. (Slovenska Polnohospodarska Univ., Nitra (Slovak Republic))
The consumption by soil nutrients by above-ground biomass and the phytocoenological composition related to quality of a grass stand were monitored on a grassland variant with additionally sown Dactylis glomerata at an altitude of 600 m above sea level in the period 1995-1997. Results showed that Dactylis glomerata L. consumed during 9 years superfluous nitrogen on the eutrophisated stand with ruderilased grassland, while the percentage of Dactylis glomerata remained at the original level of 47.7% without fertilization. The production of dry matter was still relatively high (9 t/h) and the vegetation quality nearly doubled in comparison with the grassland variant with the ruderalised biomass. The total soil nitrogen content decreased twice and the content of potassium recorded five-fold decrease. C:N ratio settled to 9.9, which only starts to be close to the value typical for grasslands. The diversity of species increased from 9 to 20 plant species and the pasture ecosystem became more cultural and stable. Although Dactylis glomerata had the positive effect on this stabilisation, the values of the original non-ruderalised grassland have not been obtained
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