The influence of biological preparations on winter rape productivity

The main objective was to evaluate various biological agents, as soil activators, which are used in the fall on the preceding crop (winter wheat) stubble and in spring on rape at bud formation stage, and the impact that these biological agents do to winter rapeseed crop development and productivity. Field experiment was conducted in 2011–2012 at ASU Experimental Station. The soil type – Calc(ar)-Epihypogleyic Luvisols (LVg - pw - cc). The biggest winter rape root collar diameter (12,75 mm) before winter was found in variant, where the winter wheat stubble was sprayed with the combination of biological preparations Azofit (1,0 l ha-1) and Amalgerol (3,0 l ha-1). In this variant 12,1 % more plants survived winter than in control field. The biggest winter rapeseed yield (4,8 t ha-1) was obtained in the variant where a combination of Azofit (1,0 l ha-1) and Amalgerol (3,0 l ha-1) was sprayed in the autumn and spring, it was 1,6 t ha-1 higher than in the control, in which biological agents have not been used, and 1,05 t ha-1 higher than in the variant where the combination of Azofit (1,0 l ha-1) and Amalgerol (3,0 l ha-1) was sprayed only in autumn on the preceding crop stubble. Efficiency of biological preparation Amalgerol was on increasing winter rape yield per plant was higher than with the biological preparation Azofit. Biological preparations improve soil properties and initiates plant physiological processes, optimize nutrition. The evaluation of clinical data, recommended for biologics Azofit (1,0 l ha-1) and Amalgerol (3,0 l ha-1) in combination for use in the autumn before winter oilseed rape sowing or after sowing in spring, early growing season spraying againVytauto Didžiojo universitetasŽemės ūkio akademij