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The main purpose of this study was to determine of the weed species and its distribution in the rapeseed fields with different soil cultivation (by mechanic and chemical) and planting time were different (from 13 Apr to 15 May) in fields of “Gatsuurt” CoLTD in the Tsagaannuur soum of Selenge province, Mongolia. A total weed species of the experimental fields was determined by methods of E.I. Liberschtaine and A. Tulikov. Used of herbicides, which are Tornoda 500, Sukhovei, Galion, Miura by “Auvgust” company of Russian were applied by individually and combination on all fields with rape germination was before and after. Results were given by below. The distribution of weeds were more little (10%=1 point) in fields of cultivation by chemically and mechanically with planting between were between 20th April to 5th May and were higher medium (34% = 3 point) in field of cultivation by chemically and higher little (25% = 2 point) in field of cultivation by mechanically and lower many (35% = 4 point) in field of stubbles. Additionally, all fields planting time was 10th May. Another experimental results given by distribution of weeds determined were little (15%=2 point) in field of cultivation by mechanically and medium (28%=3 point) in field of cultivation by chemically and little many (50%=4 point) in field of cultivation by, settles field with planting time were 15th May in all fields. Also, average number of seeds of weeds were determine 517.5-922.6 million in 0 to 20 cm in field’s soil by the methods of B.A. Dospekhov et al. The discovered 96 weeds in per square meter of the field and to applied Tornado 50 against weeds, result was stopped of living process of the weeds were 91.6%. But another experimental were discovered 116 weeds for rapeseed with 2-6 real leaves in per square meter of fields and to applied combination both Miura and Gallion against weeds. Results given 95.7% of weeds were died. Overall conclusion of all experimental, density of weeds in fields were low/lower on planting by before 10th of May but much more after that planting time. Additionally, planting by after 10th May was to restricting/blocking for rapeseed living in future. This result suggesting to negative influence for rapeseed product quality.

Study of Weed Prevalence On Rape Crop To Planting Different Time