~ 1023 ~ International Journal of Chemical Studies 2020; 8(6): 1023-1026 P-ISSN: 2349–8528 E-ISSN: 2321–4902 www.chemijournal.com IJCS 2020; 8(6): 1023-1026 © 2020 IJCS Received: 25-08-2020 Accepted: 29-09-2020 Harmanpreet Kaur Gill Department of Agronomy, School of Agriculture, Lovely Professional University, Jalandhar, Punjab, India Dr. Gurpreet Singh Department of Agronomy, School of Agriculture, Lovely Professional University, Jalandhar, Punjab, India Corresponding Author: Harmanpreet Kaur Gill Department of Agronomy, School of Agriculture, Lovely Professional University, Jalandhar, Punjab, India Weed Flora in Mustard- A review Harmanpreet Kaur Gill and Dr. Gurpreet Singh DOI: https://doi.org/10.22271/chemi.2020.v8.i6o.10897 Abstract Among all other oil seed crops mustard is the most important oil seed crop. They play wide role in economy of India. The productivity of mustard is reduced by various biotic and abiotic factors. The weed is one of the major factor to decline the productivity of mustard. The yield losses in mustard upto 45% caused by weeds. Weed flora is the life of plant that is related to weeds and they differ from place to place. The weed flora involve the population of both dicot and monocot weeds. The dicot species are more present than monocot species in mustard. The Chenopodium album, Melilotus indica, Anagallis arvensis, Cirsium arvense, Fumaria parviflora, Cornopus didymus, Phalaris minor, Rumex denticulatus, Vicia sativa, Carthamus oxycantha, Chenopodium murale, Avena ludoviciana, Medicago denticulatus etc. weeds are mostly present in mustard field. Weed flora related with soil characteristics, region, climate, cropping pattern and management factors. The weeds are noxious plant and compete with crop for wetness, light, space, nutrition supplements and reduce the quality and yield attributes of crops. Keywords: weed flora, mustard, species, dicot, monocot Introduction Oil seed crops are the second most important class in agriculture economy after cereals. Oil seeds are rich source of vitamins, proteins, fats, carbohydrates etc. In India the area under oil seeds is 262.06 m ha, production 32.10 m ton, yield 1225 kg/ha (Annual report 2018-19). Among various type of oilseeds are present in India and Mustard is the second important oil seed crop after the groundnut (Gill et al. 2012) [25] . India rank second in region after China and third underway after Canada and China contribute the 21.7% of total area and 13.4% of total production in world (Kumar et al. 2012) [16] . During 2016-17 absolute rapeseed-mustard area and production in nation is 6.41 m ha and 6.57 m ton (Solvent extractor association of India), out of which the Rajasthan only contribute the 47%. The only Rajasthan area under mustard is 2.56 m ha, production 3.65 m ton, yield 1422 kg/ha (Directorate of economics and statistics, 2016-17). Among the seven oil seeds cultivation in India, the Brassica species only contribute the 28.6% in total oil seed production. Brassica species oil is used for salad, made for cooking and after the extraction of oil the protein rich extra material is used for animal feed purposes (Sardana et al. 2011) [22] . The mustard crop grown in winter season, both irrigated and rainfed conditions. In these situations the weeds are come up with crop and interfere with crop for daylight, nutrient, space, carbon-dioxide, moisture (Kalita et al. 2017) [14] . The word weed derived from herb and during that present time they changed to unwanted plant (Urmi et al. 2017) [31] . Weeds are the bothersome plants and they are perennial problem of every farmer. In India the more losses caused by weeds upto 33% come after by the insects 20%, pathogens 26%, storage pests 7%, rodents 6% and others 8% (Kalita et al. 2017) [14] . The crop is infested with both wide leaved weeds and grassy weeds and if not managed at proper time it might result they, decline the productivity of mustard. Weed pervasion during beginning stages of crop is one of the central point to low the harvesting efficiency of mustard and 20-30% yield decrease (Singh et al. 1992). In mustard the critical period for weed competition (CPWC) 20-40 days after sowing. In Indian mustard the competition with weeds during early stages of crop in rabi season first 4- 6 week after sowing the crop (Chauhan et al. 2005) [7] . The weeds identification, different kind of weed flora, magnitude is most critical factor to decline the productivity in mustard. Losses due to weeds in mustard: AICRP (All India co-ordinated research project on rapeseed-mustard) explained that the losses from Ludhiana 18.1% and from Varanasi 41.7% in