INFLUENCE OF THE MINERAL FERTILIZATION AND THE INOCULATION WITH RHIZOBIUM LEGUMINOSARUM STRAIN ONTO THE ENERGY EFFICIENCY OF THE FORAGE WINTER PEA PRODUCTION

Rusinka Petkova, Stayka Laleva, Dimitar Pavlov

Abstract
In order to determine the energy efficiency of the forage winter pea production depending on the mineral fertilization and the inoculation with Rhizobium leguminosarum, adopted is the energy approach, comprising of comparison of the total energy outgo with the amount of energy accumulated in the production and presented in comparable measurement units (kkal, MJ). For this purpose, used are the winter pea productivity results from the agrarian experiment held 1997-1999 at the Agricultural Institute, Stara Zagora, Bulgaria.
Studied is the effect of the following alternatives:
        1. Non-fertilized (water treatment);
        2. N₆₀P₁₂₀;
        3. P₁₂+Rhizobium leguminosarum
        4. Rhizobium leguminosarum
Grounded on the study, verified is that the mineral fertilization applied and the pre-sowing treatment of the seeds with Rhizobium leguminosarum strain using the semi-wet method do have a positive effect onto the energy obtained from the winter pea biomass and the energy efficiency of its production. The highest energy efficiency factor results from the isolated application of the inoculant - 11,9 for Gross Energy (GE); 6,06 for the Metabolizable Energy (ME) and 3,45 for the Net Energy (NE).

Key words: forage peas, inoculation, energy efficiency