Performance of different Bt cotton ( Gossypium hirsutum L) hybrids under varying dates of sowin.

摘要

A field experiment was conducted at CCS Haryana Agricultural University, Cotton Research Station, Sirsa during kharif, 2011 to study the performance of Bt cotton hybrids under different sowing dates. Higher sympods/plant, bolls/plant, yield/plant, seed cotton yield and lint yield/ha were recorded in early sowing (20th April and 6th May) than late sowing (18th May and 6th June). Highest seed cotton yield was observed when sowing was done on 20th April (3166 kg/ha) and the lowest seed cotton yield was observed at 6th June (2345 kg/ha) sowing. There was no significant difference in boll weight at different dates of sowing. The reduction in seed cotton yield was 8.24 per cent at 6th May (D2), 16.55 per cent at 18th May (D3) and 25.90 per cent at 6th June (D4) sowing as compared to 20th April (D1) sowing. Seed cotton yield and lint yield/ha were significantly higher in NCS 855 than Bio 6488 and RCH 134 genotype.