The authors present the results of experiment carried out in chair of Crop Growing and Plant Breeding since 1975, and the plans for the next years. The experiments investigated principally the usefulness of some mixtures of grasses and papilionaceous plants, and the selection of the grass species for the cultivation in clear sowing system. They investigated the influence of nitrogen fertilization on the yielding and quality of hay, among other things on the greenlands in Bieszczady region. Among other things the experiments concerned the estimation of some kinds of fodder plants and grain crops in Krosno region. In experiments with maize, carried out since 1994, the influence of agricultural conditions on the quality of maize crops was investigated. The experiments were also carried out on new spring and winter triticale strains. The experiments with soya started in 1976 and included the term of sowing, seeding density, nitrogen fertilization, forecrops, herbicides, and soya usefulness to the cultivation in south-eastern Poland. The experiments resembling soya concerned horse-bean new strains and cultivars. The experiments referred to the in vitro propagation of white mulberry have been continued since 1991.
Long-term experiments fertilization were carried out in 1987-1995 years period. In experiments the yield of DM and effectivity of nitrogen fertilizer were investigated. The doses of nitrogen fertilizers were 0, 80, - 160, 240 and 320 kg N/ha, phosphorus fertilizers 100 kg P₂O₅ per ha and potassium fertilizers 150 kg K₂O per ha. Among other things was investigated the effect of N-fertilization on the floristic composition of meadow sward. The experiments were localized on the six-years permanent meadows in Łukowe (400 meters above sea level). The yield of DM systematically increased, but only to the 240 kg N per ha. The best efficiency obtained at 80 and 160 kg N per ha. The nitrogen fertilization increased the share in floristic composition such species as Cocksfoot - Timothy and Annual meadow - grass. The participation of Meadow fescue in yields was very stable.
Ten years were carried out experiments which started in 1987 on the six-years permanent meadows in locality Łukowe (400 m/a.s.l.). The doses of nitrogen fertilizers were 0, 80, 160, 240 and 320 kg N/ha. Whereas phosphorus and potassium doses were 100 kg P₂O₅ and 120 kg K₂O/ha. The yield of total protein systematically increased with the increase of nitrogen doses, and the differences between yields of nitrogen fertilizer treatments were significant. The increase of nitrogen fertilizers doses had negative influence on the content (in I cut) of phosphorus, potassium and calcium, but positive influence on the magnesium, sodium, total and N-NO₃ nitrogen content. The N-NO₃ content in yield of meadow hay was in non - toxic level.