Effect of dates of sowing and row spacing on oil yield and powdery mildew incidence of coriander cv. co-4 in North Eastern transitional tract (Zone-1) of Karnataka

Studies were conducted in Rabi 2009–10 and 2010- 11 to know the effect of dates of sowing and row spacing on yield in coriander at Agriculture Research Station, Janwada Farm, Bidar. The study consisted of five dates of sowing (D₁ - 1^st October, D₂ -15^th October, D₃ - 1^st November, D₄ - 15^th November and D₅ - 1^st December) as main plot treatments and three row spacing's (S1 - 15 × 15 cm, S₂- 22.5 × 15 cm and S₃ - 30 × 15 cm) as sub plot treatments with three replications. Among the dates of sowing, significantly the highest essential oil yield was recorded in D₂ (2.57 kg/ha) which is on par with D₁ (2.41 kg/ha) followed by D₃ (1.19 kg/ha) and D₄ (0.80 kg/ha) and the lowest PDI was recorded in D₁ (52.29) followed by D₂ (52.35), D₃ (56.27) and D₄ (59.38) whereas the highest PDI was observed in D₅ (63.05) showing that the late sown coriander are more susceptible to powdery mildew disease. Among the spacing significantly the highest essential oil yield was noticed in S₂ (1.65 kg/ha) followed by S₃ (1.49 kg/ha) and significantly the lowest in S₁ (1.28 kg/ha) and numerically higher PDI was noticed in S₁-15 x 15 cm spacing (56.83) compared to lower in S₃-30x15 cm spacing (56.51