Effect of Bt and non Bt cotton hybrids, nutrient and pest management on ginning outturn, seed and lint indices

摘要

Trash and contamination as well as variability in fibre parameter are the major constraints in availability of quality cotton fibre. Present study has highlighted the effect of Bt and non Bt cotton hybrid, nutrient and pest management in obtaining thepremier quality cotton with higher G.O.T, seed and lint indices. The cotton hybrid PHH 316 non Bt recorded maximum mean ginning percentage (38.24) amongst the cotton hybrids, and was found significantly superior over MECH 184 Bt and MECH 184 non Bt cotton hybrids during 2004 and 2005. The value of mean seed index was higher (9.17 g) for MECH 184 Bt hybrid as compared to MECH 184 non Bt (9.14) and PHH 316 (6.60). Similarly, cotton hybrid MECH 184 Bt recorded significantly higher seed index (8.57 g) as compared to MECH 184 non Bt (H2) and PHH 316 (H3) cotton hybrid during 2004. While in case of lint index, MECH 184 Bt cotton hybrid and its non Bt counterpart were found significantly superior over PHH 316. The mean ginning percentage, seed and lint indices values were found numerically higher in case of insecticidal pest management than biopesticidal pest management, however, treatment differences were found non significant during both the years. The application of graded level of chemical fertilizers 8