A field experiment was conducted at Agricultural Research Farm, Rajiv Gandhi South Campus, Barkachha, Mirzapur (U.P.) during rainy season of 2016-17. Fodder sorghum was raised in custard apple plantation adopting three seed rates (S1: 30 kg ha-1, S2: 40 kg ha-1 and S3: 50 kg ha-1) and four nitrogen levels (N1: control, N2: 40 kg ha-1, N3: 80 kg ha-1 and N4: 120 kg ha-1). Experiment was laid out in a randomized complete block design replicated thrice. Highest seed rate (50 kg ha-1) produced significantly higher plant population, plant height, number of nodes and internodes, green and dry fodder yield over 30 and 40 kg ha-1. Number of leaves, leaf area index, shoot and root dry weight at harvest was significantly higher with 30 kg ha-1 seed rate. Application of 120 kg N ha-1 resulted significant increase in the plant population, plant height, number of leaves, nodes and internodes, leaf area index, shoot and root dry weight, green and dry fodder yield at harvest over 80, 40 kg N ha-1 and control. Net returns and B: C ratio was highest under combination 40 kg ha-1 seed rate and 120 kg N ha-1.

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