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).

ftxt

DYNAMICS OF SOME CHEMICAL AND PRODUCTIVE INDICATORS OF ANNUAL SPRING CEREALS UNDER THE CONDITIONS OF CENTRAL BALKAN MOUNTAINS IN BULGARIA

VLINGORSKI

Abstract. The comparative evaluation of annual spring forage cereals under the conditions of Central Balkan Mountains in Bulgaria (Troyan region) proved that over the period from 2002 to 2004, the highest dry matter yield was harvested from sudan–grass, followed by sorghum–sudan–grass hybrid and millet. All of them exceeded the standard crop (maize) by 37.71%, 29.29% and 21.04%, accordingly. The highest value (11.39%) of crude protein content was observed for oats and of crude fat content–for millet. Maximum values of crude ash, calcium and phosphorus in dry mass had the oats. The highest crude protein yield (0.74 t/ha) was obtained from millet, and it was 12.12% higher than maize (standard crop).

Key words: annual spring cereals, dry mass yields, forage chemical composition, crude protein yields, Central Balkan Mountains, Bulgaria.

ftxt