The distribution of field pennycress (Thlaspi arvense L., Brassicaceae)in the agrocenosis of Siberian federal district and with quarantined products

The research objective was to study the distribution of field pennycress in the agrocenoses of Siberian Federal District (SFD), to reveal the types of quarantine products which most often littered by field pennycress. The research problems included using the results of geobotanical descriptions to find out the distribution of field pennycress in SFD in agrocenoses; to study the occurrence and number of seeds of field pennycress in quarantine products. The objects of the research were geobotanical descriptions made in the agrocenoses of SFD in 2018-2020, the results of gerbological examinations of the production of agrarian and industrial complex (AIC) for 2017-2020. The results of the research of the distribution and frequency of the occurrence of field pennycress (Thlaspi arvense L.) present in the agrocenoses of Siberian federal district and quarantine products. 130 geobotanical descriptions of the agrocenoses from Altai, Krasnoyarsk regions, the Republic of Khakassia, Novosibirsk, Omsk and Tomsk areas with the calculation of the frequency of occurrence and abundance of field pennycress were analyzed. When performing gerbological examinations the number of seeds of weeds by allocation of diasporas of all weed views from 10 hinge plates of each sample with the subsequent definition and calculation of each type of seeds and recalculation on 1 kg of production was established. Field pennycress in SFD is marked out with the abundance from 1 to 3 points in the agrocenoses of grain, oil-bearing, leguminous, sideralny, forage crops, potatoes, in mixed agrocenoses. In different regions of SFD the frequency of occurrence of pennycress in agrocenoses was various. On northern border of the zone of agriculture in Siberia in 2020 field pennycress was found only on laylands. At gerbological expertise the seeds of field pennycress most often meet in small-seeded crops (colza, flax). The number of field pennycress seeds in separate batches of phacelia can exceed 10 thousand pieces/kg.