T. S. KERTIKOV and D. V. KERTIKOVA
Institute of Forage Crops, BG - 5800 Pleven, Bulgaria
KERTIKOV, T. and D. KERTIKOVA, 2004. Study on some characteristics determining the development and the secondary growing-up of winter forage pea (Pisum sativa L.). Bulg. J. Agric. Sci., 10: 563-566
The developments concerning the twofold (two-cut) harvesting of some annual forage crops are of special interest in the field of plant sciences. In this connection during the period - 2000-2003, a two-factor field trial was laid out. The influence of four heights of cutting (5 cm; 10 cm; 15 cm and 20 cm ) at phenological stages of budding-first flowers, 25 % flowering and 50 % flowering on main characteristics determining the development of winter forage pea and the possibility for secondary growing-up were followed-up.
The highest rate of growing-up was recorded at the phenological stage of budding (30.2) and the maximum average 24-hour increment at the phenological stage of 50% flowering (4.12 cm). The phenological stage of harvesting of the primary growth of winter forage pea exerted more substantial influence on the number of root-stubble plants as compared to the height of cutting of the growth.
The height of cutting of the primary growth exerted a primary influence on the rate of secondary growing-up and the phenological stage of harvesting exerted a relatively slighter one. Maximum rate of secondary growing-up was recorded at a height of cutting of the primary growth of 20 cm.