Share the impact of t agricultural techniques on the incidence of rot in sugar beet agrocenosis

In the paper shares of influence of the main processing methods (factor A) and fertilization backgrounds (factor B) on the prevalence of sugar beet root diseases are investigated and established. As a result of the research, a complex of typical and random pathogens of sugar beet root rot was established: dominant - F. oxysporum, F. solani, R. stolonifer; frequent - bacteria, F. oxysporum v. ortoceras; rare - Mucor sp., A. alternata, Aspergillus sp., F. gibbosum; random - Penicillium sp., Gliocladium sp., T. viride. Analysis of the species composition of root rot pathogens showed that every year the structure of the population expanded. As independent pathogens of rot were: R. stolonifer v. stolonifer-Rhizopus rot (2010- 2011), Penicillium sp. - penny rot (October 2010), A. alternata - Alternaria rot (October 2012-2013), bacterial rot (2012-2013). The main pathology was Fusarium rot (Fusarium sp.). It was found that phytopathogenic mycobiota of soil and rhizosphere developing on plant residues accumulated in the upper soil horizons during tillage promotes the spread of the disease and increases the probability of pathogens. The greatest prevalence of root rot is established in the variant with flat-cutting treatment and high background (N_6gP_6gK_6g + 11 tons of manure/1 ha of crop rotation) fertilizer (up to 26.1%). The prevalence of rot in the variants during the main treatment with the formation turnover was the lowest (P = 0 - 16.3 %). Mathematical processing of the data showed that the share of influence of the main tillage on the prevalence of root rot was 68%, the share of influence of fertilizers - 24%.

сахарная свекла, гнили корнеплодов, Fusarium sp, основная обработка почвы, фон удобренности, доли влияния факторов, Sugar beet, root rot, Fusarium sp, the main soil treatment, background fertilization, the pro-portion of the influence of factors