Performance of cotton genotypes under different planting dates in south western Punjab

摘要

A field experiment was conducted at Punjba Agricultural University, Regional Research Station, Faridkot during khartf, 2009 and 2010 to evaluate the effect of planting dates on growth, yield attributes and seed cotton yield of different cotton genotypes in split plot design replicated thrice. Four cotton genotypes including two hirsutum and two arboreum [le Bt cotton hybrid RCH 134, hirsutum variety LH 2076, desi cotton hybrid PAU 626 H and desi cotton variety LD 694) were planted on four dates Le. April, 20 and 30, May 10 and 20. Pooled data indicated a significant decline in seed cotton yield of all the tested genotypes with any delay in planting beyond May, 10. Cotton planted on April 20 and 30 and May 10 recorded significantly better seed cottonyield (SCY) as compared to May 20 planting during both the years. This increase in SCY was mainly due to improvement in boll number, boll weight, monopods and sympods/plant. Statistically least SCY was recorded under May 20 (2390.2 kg/ha) as a result ofsignificant reduction in yield contributing characters were such as bolls and boll weight/plant. Among genotypes, PAU 626 H (3166.2 kg/ha) recorded highest seed cotton yield followed by RCH 134 Bt (3072.9 kg/ha) as compared to LH 2076 (2562.0 kg/ha) andLD 694 (2506.5 kg/ha) owing to higher number of bolls/plant. Two year study indicated that farmers should prefer PAU626H and RCH 134 Bt among the tested genotypes and must complete the planting by May, 10.