Natalia GEORGIEVA, Ivelina NIKOLOVA, Grozi DELCHEV
Abstract. During the period 2007–2009 in IFC–Pleven is carried out three–factor field trial with purpose to evaluate the stability of mixtures among preparations with different biological effect on basis of the grain yield in spring forage pea. It is used the split plot method. Factor A includes the three years of the study. Factor B (preparations) includes 8 levels: untreated control, Atonic (growth stimulator), Masterblend (combined leaf fertilizer), Atonic + Masterblend, Confidor (insecticide), Confidor + Atonic, Confidor + Atonic + Masterblend, Confidor + Masterblend. Factor C (stages of treatment) includes 3 levels: budding, budding + flowering, flowering. In result of the held experiment is found that the preparations with different biological effect Atonic, Masterblend and Confidor used alone and in mixtures increase the productivity in the spring forage pea (from 101,9 to 129,0%). With highest stability is distinguished the triple mixture Confidor + Atonic + Masterblend (applied at budding stage), followed by mixtures Confidor + Atonic and Confidor + Masterblend (applied at flowering stage) and at alone use of preparations–the leaf fertilizer Masterblend (applied at flowering stage). Technologically variants which match high stability and high productivity in the different years are appearedConfidor + Masterblend and + Atonic.
Keywords: stability, pea, preparation with different biological effect