A line × tester crossing programme was taken up with three female lines and ten male parents with a view to obtain best heterotic crosses for seed cotton yield and its attributing traits. Heterosis over better parent and standard check were estimated for yield and its contributing characters in 30 cross combinations. The hybrids viz., GSHV 155 × GSHV 112, G. Cot. 20 × BC 68-2, G. Cot. 20 × 76
... [Show full abstract] IH-20, GSHV 01/1338 × GISV 218, GSHV 155 × Surat dwarf, GSHV 01/1338 × BC 68-2 and GSHV 155 × LRA 5166 showed significant positive standard heterosis as well as heterobeltiosis for seed cotton yield per plant, number of bolls per plant and boll weight. The crosses exhibited highest heterosis due to increase in boll number and boll weight was significantly associated with increase in yield and these crosses could be considered for exploitation of hybrid vigour.