Determination of Suitability of Annual Spring Legume Forage Crops for Production of Green Forage under the Conditions of Central Balkan Mountains

V. LINGORSKI1 and T. KERTIKOV2
1 Institute of Upland Stockbreeding and Agriculture, BG- 5600 Troyan, Bulgaria
2 Institute of Forage Crops, BG- 5800 Pleven, Bulgaria

Abstract

LINGORSKI, V. and T. KERTIKOV, 2005. Determination of suitability of annual spring legume forage crops for production of green forage under the conditions of Central Balkan Mountains. Bulg. J. Agric. Sci., 11: 557-563

The experimental activity covered the period 2002-2004. The comparative testing of annual spring legume forage crops conducted under the conditions of Central Balkan Mountains (Troyan region) distinguished three groups. First group: high productive and suitable for the conditions of these studies. This group included only white lupine, which showed high and stable yields in all three years of study, being on average for the period by 98.0 % above the control. Second group: productive and suitable for the conditions of the studied region. In included horse bean and spring vetch. On average for the three-year period, they were higher yielding by 39.3 % and 10.4 %, respectively. Third group: low-productive and unsuitable for the region. Soybean, bitler vetch and chickling vetch proved to be such. Their yields were unsatisfactory and rather lower than that of the control treatment.
At the time of harvesting, the plants of spring forage pea were the highest (116.48 cm), followed by spring vetch and white lupine. The obtained dry mass was mainly formed from the plant stems and leaves. In vetch, white lupine and horse bean the stem participation was 51.23 % to 55.96 % respectively. The leaf mass was prevailing at the time of harvesting of soybean and bitler vetch.
The weed infestation was relatively low in whit lupine, followed by spring pea, soybean and horse bean. The greatest share of weed vegetation was found in the bitler vetch stand.

Key words: annual legume crops, dry mass yield, yield structure, weed infestation