Erzurum ve yöresi patates dikim alanlarında sorun oluşturan yabancı otlar ve önemlilerinin topluluk oluşturma durumları üzerinde araştırmalar
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This research was conducted in the hiGhest potato cultivatingdistricts of Erzurum in 1988 in order to determine theweed species causing problem in potato fields and to calculatetheir intensity and association. A frame in onesquare meter were thrown 374 times randomly to the potatofields representing the features of the district. The numbeIof frames thrown to each field varied according to the sizeof the fields.In Erzurum Region 107 weed species from 27 families wereidentified and an avarage of 47.410 weeds were found in onesquare meter. The number of species and their mean intensityshowed differences between the districts. The most densespecies were Amaranthus retroflexus L. (redroot pigweed)(14.529), Chenopodium album L. (common lambsquarters) (8.332),Convolvulus arvensis L. (field bindweed) (5.810), Setariaviridis (L.) P. Beauv. (green bristle-grass) (4.810),SinapiS arvensis L. (wild mustard) (1.305) ve Cirsium ~vense(L.) Scop. (creeping thistle) (1.059). The number ofspecies invading the potato fields of Erzurum were 68 inCentral District, 64 in A@kale, 41 in Pasinler and Narmanand 29 in Oltu, while their intensity in 1 m2 were 58.042in Central district, 62.543 in A§kale, 33.959 in Fasinler,35.250 in Narman and 43.396 in Oltu.In the fields where the research was carried out, the chiefweed species of the association were redroot pigweed, commonlambsquarters, field bindweed, green bristle-grass, wild·-mustard and creeping thistle. The species were almost similarin every district and the number of species found inthe associations of every district were 11 in Harman, 8 inCentral District and Oltu, 7 in A§kale and 6 in Pasinler.