– The botanical composition of the grass was determined by the N×P interactions. The following coverage values were determined against the N×P supply: Tall fescue: 3–52%, Agropyron: 0–40%, inhabited smooth brome: 4–31%, cocksfoot: 1–4%. Weeds and papilionaceae became more widespread on the N-deficient soil, while grass species were reduced, representing 26%. The average number and coverage of grass species increased as a result of the abundant N and NPK supply. The cover of smooth brome was doubled due to increasing K doses.
– Hay yield increased from 1.1 t ha-1 to above 5 t ha-1 mainly as a result of N supply. The water use efficiency was parallel to this phenomenon. The grass used 2000 l water for the production of 1 kg hay on the N control plot, while the same value was 800 l in the 100 kg ha-1 year-1 treatment and 511 l in the 300 kg ha-1 year-1.
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