DYNAMICS OF FORAGE BIOMASS ACCUMULATION IN MAIN PHENOPHASES OF A NATURAL MEADOW OF AGROSTIS CAPILLARISFESTUCA FALLAX TYPE IN THE RHODOPE MOUNTAINS (BULGARIA)

Yanko KOZHOUHAROV, Vladimir LINGORSKI

Abstract. The purpose of this study was to establish the changes in biomass productivity and forage chemical composition in main phenophases of vegetation period of a natural meadow Agrostis capillaris-Festuca fallax type in the Rhodope Mountains (Smolyan region, Southern Bulgaria). The greatest dry mass yields (2.91 and 2.68 t.ha-1) were obtained after annually fertilization with N160P80 and N80P80. With advance of vegetation (from complete stalk shooting to complete flowering) was established a decreasing of the crude protein, crude fat and crude ash contents, while in the crude fiber and nitrogen-free extract substances (NFES) was reported an increasing. The most crude protein production was obtained after fertilization with N160P80 (0.89 t.ha-1), and at least in the unfertilized control (only 0.33 t.ha-1). The most feed units (FU) per 1 ha also were reported in fertilization-use N160P80 (2184.33 FU) and N80P80 (1892.00 FU).

Key words: natural meadow, phenophase, biomass accumulation, chemical indicators, the Rhodope Mountains.

INFLUENCE OF MINERAL FERTILIZATION AND WAYS OF USE ON NATURAL MEADOW OF AGROSTIS CAPILLARIS–FESTUCA FALLAX TYPE IN THE RHODOPE MOUNTAINS (SOUTHERN BULGARIA)

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.ha1 (annually hay–pasture uses), from 4.72 to 5.21 t.ha1 (annually pasture–hay uses) and from 5.84 to 6.40 t.ha1 (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.

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