N. GEORGIEVA and T. KERTIKOV
Institute of Forage Crops, BG - 5800 Pleven, Bulgaria
GEORGIEVA, N. and T. KERTIKOV, 2006. Study of forage productivity and chemical composition of winter vetch (Vicia villosa R.) under optimization of the factors of sowing time and rate. Bulg. J. Agric. Sci., 12: 447-454
The trial was carried out during the period 2001-2004 by the design of long plot method without irrigation. A number of 9 treatments were formed by mutual combination of factor degrees. Winter vetch variety Asko 1 was used in the study. The stands for forage were harvested at the phenological stage of early flowering. The objective of this study was to investigate forage productivity and chemical composition of winter vetch (Vicia villosa R.) under optimization of the factors of sowing time and rate. It was found that the optimal sowing time of winter vetch variety Asko 1 for forage production under the conditions of Central Northern Bulgaria was 20-25 September. The obtained forage yield was mathematically significantly higher than those from the other studied sowing dates. The optimal sowing rate, irrespective of the date, was 220 g.s./m2. The sowing rate exerted a smaller influence on the forage yield, as compared to the sowing time. The content of crude protein, crude fibre and calcium in the vegetative biomass of winter vetch was influenced by the sowing time, but not by the sowing rates differing in size. Similar relationship was not observed in phosphorus content.