Productivity and Forage Quality of Common Vetch ‘ (Vicia sativa L.) under Organic Production Conditions

摘要

The widespread entering of organic production in the agrarian sector in recent years requires an assessment of the possibility of growing different crops under these conditions, of their productivity and production quality.The present study was conducted during the period 2012-2014 at the IFC (Pleven) and aimed to evaluate the productivity and forage quality of common vetch in organic production conditions. The organic production included four variants: growing under natural soil fertility without use of bioproducts and alone/combined use of organic products (foliar fertilizer Biofa, growth regulator Polyversum, bioinsecticide NeemAzal T/S).As a comparative characteristic, a conventional production variant was used which included treatment with synthetic products (leaf fertilizer Masterblend, growth regulator Flordimex 420 and insecticide Nurelle D). Common vetch was presented by two varieties: Obrazets 666 and Tempo. The results showed that the vetch biomass productivity of common vetch in organic production was on average 7.6 to 35.7% lower compared to conventional growing.The difference in productivity between the variants with the triple combination of bioproducts (Biofa, Polyversum and NeemAzal T/S) and synthetic products (Masterblend, Flordimex 420 and Nurelle D) was negligible and statistically insignificant. The responsiveness of the two varieties to the applied bioproducts was more pronounced in Obrazets 666. Regarding the forage quality in vetch organic growing (compared to conventional production) was established a general trend of decrease in content of mineral nitrogen and fiber cell wall components, an increase in energy feeding value and a lack of differences in in vitro digestibility. With the most favorable composition of forage was distinguished the biomass formed after combined application of the products Biofa, Polyversum and NeemAzal T/S, as well as under alone treatment with NeemAzal T/S.