Influence of predecessors on species diversity of weeds in winter wheat crops in the Eastern Forest-Steppe of Ukraine

Goal. Determine the species composition of weeds, their dominant role and establish type level weediness winter wheat crops by cultivation on black fallow, after peas for grain as forecrops in Eastern Forest-Steppe Ukraine.
 Methods. The research was carried out means route surveys field experiments located a stationary nine-field steam-grain-row crop rotation monoculture wheat.
 Results. In total, according to results 2011—17, 63 weeds were found crops. conditions fields fallow grain, 50 45 found, respectively, — 41 species. largest number spring early late (41—49%), second third places occupied wintering, biennial (33—37%) perennial (18—22%). main were: Setaria glauсa, Chenopodium album, Amaranthus retroflexus, Solanum nigrum, Fumaria officinalis, Polygonum lapathifolium, Cyclachaena xanthifolia, Delphinium consolida, Viola arvensis, Erigeron canadensis, Cirsium arvense; S. Echinochloa crus-galli, C. A. F. P. Stachys annua, Malva neglecta, aviculare, D. Thlaspi arvense, V. Convolvulus arvensis; E. Ambrosia artemisiifolia, Fallopia convolvulus, Lactuca serriola, Capsella bursa-pastoris, Matricaria inodora, Crepis tectorum. crops, share dominance subdominance, nigrum L. (71%) glauca (L.) Beauv. grain. depended predecessor. monoculture, there higher than rotation.
 Conclusions. Rational selection predecessors creates basis successful weed control