TY  - JOUR
T1  - Determination of Densities and Frequencies of Problematic Weed Species in  Onion Planting Areas of Ankara and Çorum Provinces
AU  - Arıkan, Nilgün
AU  - Kadıoğlu, İzzet
PY  - 2022
DA  - December
JF  - Selcuk Journal of Agriculture and Food Sciences
JO  - Selcuk J Agr Food Sci
PB  - Selcuk University
WT  - DergiPark
SN  - 2458-8377
SP  - 493
EP  - 500
VL  - 36
IS  - 3
LA  - en
AB  - This study was conducted in 2019 in order to determine the weed species, their densities and frequency of occurrences in the onion production areas of Ankara and Çorum Provinces. The surveys were carried out in 78 fields, 55 in Ankara and 23 in Çorum. As a result of the surveys, 75 weed species, two of which are parasite, belonging to 28 families and 64 genera, were determined in the onion fields of Ankara Province. The families with the most species were listed as Asteraceae (11), Poaceae (9), Fabaceae (6), Chenopodiaceae (5) and Apiaceae (5). Other families were determined between 1-3 species. Of these weeds, Convolvulus arvensis L. (1.2 plants/m2), Xantium strumarium L. (0.50 plants/m2 ), Amaranthus retroflexus L. (0.40 plants/m2), Cuscuta sp. (0.37 parazited onion/m2), A. blitoides S. Watson (0.36 plants/m2) were the 5 most intense species. According to the frequency of occurrence, the first five species are determined as; C. arvensis L. (90.90%), X. strumarium L. (65.45%), A. retroflexus L. (54.54), Chenopodium album L. (52.72%), A. albus L. (47.27%). In the onion cultivation areas of Çorum Province, 61 weed species one of which is parasite, belonging to 24 families and 51 genera were determined. The families with the most species were listed as Asteraceae (9), Poaceae,(8) Apiacea (5), Polygonaceae (4), Fabaceae (4); as for other families, between 1-3 species were determined. Considering the densities per m2 of these weeds, the 5 most common weed species are determined as C. arvensis L. (0.80 plants/m2), Anethum graveolen L. (0.56 plants/m2), A. retroflexus L. (0.41 plants/m2), Chrozophora tinctoria (L.) Raf. (0.32 plants/m2), X. spinosum L. (0.31 plants/m2), the first five species in terms of frequency of incidence are; C. arvensis L. (86.95), A. refroflexus L. (56.52%), X. strumarium L. (56.52%), Cirsium arvense (L.) Scop. (52.17%), C. album L.(52.17%).
KW  - Onion
KW  - Weed
KW  - Survey
KW  - Density
KW  - Frequency of Occurrence
UR  - https://dergipark.org.tr/en/pub/selcukjafsci/issue//1276014
L1  - https://dergipark.org.tr/en/download/article-file/3055449
ER  -