<p>Cumin is one of the important spice crops grown in arid and semi arid regions of India and is being adopted to cure some of the dreaded diseases. Determination of optimum water requirement which is function of soil crop and atmosphere is needed for achieving more profit and higher productivity per unit of water. Keeping in view, a field experiment was undertaken to access the conjugate impact of three irrigation regimes (0.6IW/ET_c, 0.8IW/ET_c and1.0IW/ET_c) and three lateral spacing (0.60m, 0.70m and 0.80m) on productivity of cumin. Split plot design with three treatment replications was adopted. Drip irrigation with 0.8 IW/ET_c resulted higher seed yield, plant height and dry matter of 1344.17 kg/ha, 36.42 cm and 2365 kg/ha respectively at 0.8 IW/ET_cwith lateral spacing 0.6 m as compared to other treatments.&nbsp; Highest water use efficiency (5.58 kg/ha.mm) was observed at 0.6 IW/ET_c with 0.60 m lateral spacing. Highest B:C ratio (2.27) observed at 0.8 IW/ET_cwith lateral spacing 0.6m as compared to other treatments.</p>