Langfristige Effekte abgestufter N-, P-, K-Gaben bei Mähweiden verschiedener Standorte auf die Zusammensetzung der Pflanzenbestände unter den Aspekten floristischer Diversität und Agronomie

The research was initiated to determine the floristic diversity and forage quality including ensilability and mineral content of long-term (= 16 years) differentiated fertilised mowing pastures classified as Lolio-Cynosureten. At four different sites (= 210, 260, 360 and 620 m above sea-level) the factors N supply (= 0, 160 and 320 kg N ha-1 a-1), P supply (= 0, 60 and 120 kg P2O5 ha-1 a-1) and K supply (= 0, 80 and 160 kg K2O ha-1 a-1) were tested in 27 different supply combinations in a latin rectangle design with three replicates. DM yields of first growth and soil chemical values (= pH, P and K concentrations) were determined. Concerning floristic diversity the species number, Shannon- and Simpson-Index as well as Shannon- and Simpson-evenness were determined. Regarding the forage quality the concentrations of energy, crude protein, minerals, water-soluble carbohydrates and the buffering capacity were analysed.