A field experiment completed during the summer season of 2022. The field study was conducted in the Agronomy farm at school of agricultural sciences and rural development, Nagaland University. The experiment was laid out in Randomize Block Design (RBD) with three replications and 7 weed control Treatments with Imazethapyr viz; T1 (Weedy check), T2 (Two hand weeding at 20 DAS and 40 DAS, T3 (Imazethapyr @ 50 g a.i. ha-1 at 10 DAS), T4 (Imazethapyr @ 75 g a.i. ha-1 at 10 DAS), T5 (Imazethapyr @ 50 g a.i. ha-1 at 15 DAS), T6 (Imazethapyr @ 75 g a.i. ha-1 at 15 DAS), T7 (Imazethapyr @ 100 g a.i. ha-1 at 25 DAS). The highest number of root nodule T7 (21.83) and maximum dry weight of root nodule (mg) T7 (15.50). Maximum nutrients (N, P and K) uptake by crop Treatment Two hand weeding at 20 DAS and 40 DAS are (43.87, 7.37 and 23.17 kg ha-1) followed by Imazethapyr @ 100 g a.i. ha-1 at 25 DAS (39.80, 6.77 and 21.67 kg ha-1) and highest nutrient depletion weedy chek treatment. In irrigated condition high weed infection in blackgram crop. This research find out suitable dose and time of imazethapyr in irrigated blackgram.

Blackgram, Uptake, Depletion, Imazethapyr

Different weed control techniques had a considerable impact on the quantity of root nodules in plant-1. The lowest root nodule and root dry weight was found in weedy check, while the highest were found in 50 DAS imazethapyr @ 100 g a.i. ha-1 at 25. The best results were obtained with the herbicide treatments Imazethapyr 100 g a.i. ha-1 at 25 DAS and two-hand weeding at 20 and 40 DAS, which maximised crop nutrient uptake.

Lalchand Kumawat, A.P. Singh, Bishan Singh, B. Rajeswara Reddy, Mude Ashok Naik, Ganpat Lal Kumawat, Ashok Kumar Samota, Ruchika Choudhary, Girraj Sharma and Simran Jast (2023). Effect of Imazethapyr on Symbiotic Activities, Quality and Nutrient Uptake of Blackgram (Vigna mungo L.). Biological Forum – An International Journal, 15(11): 495-498.