Yanko KOZHOUHAROV, Vladimir LINGORSKI
Abstract.The experiment showed that the application of mineral fertilization up to N160P80 increased dry matter yields between different ways of use as follows: from 5.88 to 6.45 t.ha–1 (annually hay–pasture uses), from 4.72 to 5.21 t.ha–1 (annually pasture–hay uses) and from 5.84 to 6.40 t.ha–1 (1st year: pasture–hay uses; 2nd year: only pasture use; 3rd year: hay–pasture uses). As regards to studying chemical indicators of the forage (crude fiber, crude fat, crude ash and nitrogen–free extract substances) the mineral fertilization and alternation of ways of use had a positive effect. The introduction of mineral fertilizers at a rate up to N160P80 increased the obtained feed units and crude protein per 1 ha.
Key words: natural meadow, mineral fertilization, ways of use, productive and chemical indicators, the Rhodope Mountains.