The changes of botanical composition and yield in dependence on the type of grassland and fertilization
1998
Gaisler, J. | Fiala, J. | Spoustova, B. (Ustav Zemedelskych a Potravinarskych Informaci, Liberec (Czech Republic). Vyzkumna Stanice Travnich Ekosystemu)
Three types of grasslands - renewed, slot seeded and permanent one - were studied. Changes of botanical composition and yield were recorded in dependence on the type of grassland and fertilization. The same clover/grass mixture composed of five components and the same sowing amount of single components (generic hybrid Festulolium - the variety Felina 12 kg.ha-1, Lolium perenne - the variety Sport 8 kg.ha-1, Dactylis glomerata - the variety Niva 4 kg.ha-1, Trifolium pratense - the variety Kvarta 3 kg.ha-1 and Trifolium repens - the variety Huia 2 kg.ha-1) were used for the renovation and slot seeding. The original grassland seems to be the stablest as to the yield. During the first two years the yields of temporary grasslands were the highest (fourth variant reached average 8.89 t.ha-1 against 8.12 t.ha-1 permanent grassland), but then the yield was reduced. Native species of the grass, mainly Agrostis capillaris, Holcus mollis and Festuca rubra took empty places, as regards the variants fertilized with N also Alopecurus pratensis. Slot seeding did not bring the demanded results. The results was the fall of covering of the vegetation and the following drop of yield of the forage (2.88 t.ha-1). The same species by renovation with predominance of Festuca rubra were increased here. In all types of grassland the development of clover was supported with the P and K fertilization without N (in permanent grasslands 20 %). On the contrary, in the variants fertilized with N the clover diminution and a high predominance of grass were recorded .
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