Author(s):

Pushpa Ujjainiya, Ramkishor and MR Choudhary

Abstract: Application of weed management treatments under varying levels of nitrogen is important in better onion (<em>Allium cepa</em> L.) production. Uptake of nitrogen (N) by onion plant is dependent upon many factors including type of weed species, intensity and the rate N fertilizer. To understand interactions among onion, applied N, and weed management is important in developing management strategies. A field experiment was conducted at SKN College of Agriculture, Jobner for two consecutive years during Rabi 2016-17 and 2017-18 to find out the efficient weed management in onion under varying levels of nitrogen. Among the different weed management treatments weed free check <em>i.e.</em> twice hand weeding treatment recorded significantly higher agronomic efficiency, apparent recovery of N and physiological efficiency of N to rest of the treatments except application of pendimethalin (PP) + oxadiargyl at 40 DAT or application of pendimethalin (PP) + 1 HW at 40 DAT, being statistically at par with each other. Similarly, highest agronomic efficiency, apparent recovery of N and physiological efficiency of N were obtained with 100 kg N ha^-1 and declined with further increase in dose of N.

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