Author(s):

Vidhi Garg, Nitish Tiwari, Omprakash Rajwade and SK Gupta

Abstract: The present investigation entitled “Nutrient uptake by direct seeded rice (Oryza sativa L.) and removal by dominant weeds species in Chhattisgarh plains ” was carried out at Research cum Instructional Farm Farm, Indira Gandhi Krishi Vishwavidyalaya (IGKV), Raipur (C.G.) during Kharif season of 2016. Rice variety Rajeshwari was direct seeded on June 27^th 2016 with a spacing of 20 x 10 cm and harvesting was done on November 3^rd, 2016. The results of experiment indicated that maximum uptake of nutrient in grain and straw was recorded in weed free (3 Hand weeding) (T₉) 56.14 and 17.52 kg ha^-1 of N, 15.26 and 5.07 kg ha^-1 of P and 14.16 and 85.03 kg ha^-1 of K, respectively. Minimum uptake of 6.70 kg ha^-1 of N, 0.91 kg ha^-1 of P and 13.32 kg ha^-1 of K was observed in control (Mixed flora) (T₈) taking the total values of grain and straw. The nutrient removal by weeds was recorded maximum under control (Mixed flora) (T₈) at 80 DAS 61.73, 8.72, 169.95 and at harvest 73.79, 10.44, 203.46 N, P, K kg ha^-1. The lowest nutrient removal of N, P and K kg ha^-1 was 0.36, 0.12, 0.93 and 0.82, 0.28, 2.13 at 80 DAS and harvest respectively under weed free (3 Hand weeding) (T₉).

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