Effect of fertilizer N on nodulation, acetylene-reducing activity, and N uptake in pigeon pea (Cajanus cajan)

Umesh K. Kaushik, R.C. Dogra, S.S Dudeja


The effect of fertilizer N as urea on the early growth of two pigeon pea [Cajanus cajan (L.) Millsp.) cultivars with Bradyrhizobium inoculation under pot culture conditions was investigated. Bradyrhizobium inoculation alone increased nodulation, acetylene-reducing activity (ARA), and root and shoot N. A considerable improvement in the root system of pigeon pea over control was observed at 20 kg N ha-1 while at 40 and 60 kg N ha-1 the root system was the poorly developed and, concomitantly, this affected other N2-fixing parameters viz. nodule number, nodule dry weight, ARA, shoot weight, and root and shoot N.


Nodulation; Acetylene-reducing activity; Pigeon pea; Fertilizer N; N2 fixation; Rhizobium

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