A field experiment was conducted at Research Farm, CCS, Haryana Agricultural University, Hisar during 2007 and its Regional Cotton Research Station, Sirsa during 2008 to find out the optimum crop geometry and fertilizer doses for Bt cotton ( Gossypium hirsutum L.) hybrids RCH134. A closer spacing of 67.5*60 cm gave significantly higher seed cotton yield (3230 and 3906 kg/ha at Hisar and Sirsa, respectively) than other two spacing i.e. 100*45 and 100*60 cm at both the locations. The highest seed cotton yield (3061 and 3902 kg/ha at Hisar and Sirsa, respectively) was recorded with a fertilizer dose of 125 per cent RDF (187.5-75-75 kg/ha N, P 2O 5 and K 2O) as compared to 75 per cent RDF and 100 per cent RDF at both the locations. The crop geometry, 67.5*60 cm and fertilizer dose of 187.5 kg/ha N, 75 kg/ha P 2O 5 and 75 kg/ha K 2O is ideal for getting higher seed cotton yield of Bt cotton RCH134.
