For establishing the effect of different growth regulators: Atonic – 0.6 L ha-1. Masterblend – 1.6 kg ha-1 and Confidor 70 VG – 0.15 kg.ha-1 applied alone and in combination in budding; budding + flowering and flowering on the productivity, composition, nutritive value and energy efficiency, field experiment with spring pea, cultivated for fresh biomass was conducted at Institute of Forage Crops, Pleven. Energy efficiency was calculated by balance method (energy input and output) by energy equivalents for all operations and energy value of the biomass calculated by composition and digestibility. Treatment of spring pea variety Pleven 4 with Atonic, Confidor and Masterblend had a positive effect and increased the yield of biomass and had no effect on chemical composition, nutritive and energy value of the biomass. Application of combination Confidor + Masterblend in budding + flowering stages leads to increasing the yield of dry matter with average 25,3 % and output of gross energy with 26,5 %. The coefficient of energy efficiency (conversion of gross energy) of spring pea cultivated for fresh biomass is average 10,7. Treatment of pea with combination Confidor + Masterblend increases the coefficient of energy efficiency of GE with 21 %.
N. Georgieva, I. Nikolova, D. Pavlov , T. Zhelyazkova, Y. Naydenova