Nutrient uptake by direct seeded rice (Oryza sativa L.) and removal by dominant weeds species in Chhattisgarh plains

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 27th 2016 with a spacing of 20 x 10 cm and harvesting was done on November 3rd, 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).