CORRELATIONS AND DEGREE OF VARIATION BETWEEN YIELD AND SOME INDICATORS OF GROWTH AND CHEMICAL COMPOSITION OF THE GRASS FR THE BIRDSFOOT TREFOIL AND ITS MIXTURES WITH MEADOW GRASS SPECIES

 Boriana CHOURKOVA 

Abstract. From 2002 to 2005, the behaviour of local population of birdsfoot trefoil in binary mixtures with meadow grass species was conducted in the experimental field of RIMSA–Troyan. The variants of the experiment include testing of birdsfoot trefoil–variety Turgovishte 1 (referenceSt), cultivated its own and local population of birdsfoot trefoil in binary mixtures with tall fescue (Albena); perennial ryegrass (Pleven population); bromegrass (Nika); smooth–stalked meadow grass (Troyan population); orchard grass (Dabrava); red fescue (Troyan population); wheatgrass (Ruff). The height of plants shall be amended under the influence of weather conditions, the rate of growth and development of grasses interrelation and competitiveness of the components in grass composition indicative of received Variation coefficients.The production of birdsfoot trefoil and grass types varied with regard to treatments and years. The variation coefficients indicating yields stabilityshowed that it was best expressed in the mixture of birdsfoot trefoil and tall fescue (CV=45.42%) andorchagrdgrass(CV=48.65%).The values of crude protein in all variants were negative correlation coefficient. The correlationcoefficient of the compound with crude fiber content was very positive and strong correlations.

 Key words: birdsfoot trefoil, mixtures, productivity, chemical composition, correlation analysis, height

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BIOCHEMICAL TRAITS AND CORRELATION ASSOCIATIONS BETWEEN CHEMICAL COMPOSITION AND SOME PARAMETERS YIELD IN BIRDSFOOT TREFOIL

Boryana  Georgieva CHURKOVA

Abstract:The field trial was conducted during the period 2002–2005 in the Experimental field of the IMSA Troyan for determination of the biochemical traits and correlation associations between chemical composition and some parameters yield in birdsfoot trefoil. There were included for study varieties Targovishte 1–St (Bulgaria) and 4 specimens of birdsfoot trefoil: local population (Hungary). K–30 (Serbia), Pulavskii (Poland) and Viking (USA). The studied accessions birdsfoot trefoil differed in chemical composition. The variety Viking (19.07%) was characterized with highest content of crude protein and lowest values of crude fibber (27.75%). Was positive correlation between the height of stems (r = 0.6229) and dry mass yield (r= 0.5271) and weak strength of correlation between the content of crude protein and the height stems (r = 0.4238). The registered quality traits a forage of birdsfoot trefoil formed under conditions of set on light grey pseudo podzolic are interest in the breeding.

Key words: birdsfoot trefoil, varieties, populations, chemical composition, correlation associations

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CHANGES IN SOME FORAGE INDICATORS OF ANNUAL WINTER CROPS UNDER THE CONDITIONS OF CENTRAL BALKAN MOUNTAINS IN BULGARIA

V. LINGORSKI

Abstract. In this study the highest dry matter yields were harvested from triticale (for pure crops) and from triticale+winter pea (for mixed crops). By pure crops the highest values of crude protein content (8.78 and 9.02%) had winter barley and winter vetch, and by mixed crops–winter barley+winter pea, winter barley+winter vetch and triticale+winter pea (11.40, 9.15 and 9.17%, respectively). The content of crude fat in forage had near values for studying pure and mixed crops. For all sowing crops the crude fibre content varied also in comparatively little limits, while the nitrogen–free extract matters for pure crops ranged within widely limits in comparison with mixed crops. The highest crude protein yield from all crops (without the standards) was obtained only by triticale, and it was 40.00% higher than winter barley. All other crops had a lower productivity than other corresponding standards.

Key words: annual winter crops, dry mass, chemical composition, crude protein yield, Central Balkan Mountains (Bulgaria).

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