An experiment was conducted during two consecutive years of kharif 2012 and 2013 at Agricultural Research Station, Banswara to find out the suitable drip irrigation regimes and optimum nitrogen dose for Bt cotton. The experiment was laid-out in split plot design with four replications having twelve treatment combinations. Results revealed that, the application of irrigation at 0.6 ET gave significantly higher seed cotton yield (1989 kg/ha) as compared to irrigation regime of 1.0 ET and surface irrigation (control),but it was found at par with application of irrigation at 0.8 ET (1905 kg/ha). Increasing the seed cotton yield of Bt cotton with increasing of nitrogen levels from 50% RDN & K to 100% RDN & K. The maximum seed cotton yield (2068 kg/ha) was recorded under application of 100% RDN & K over application of 75% and 50% RDN & K (1673and 1448kg/ha), respectively in the pooled analysis. Application of irrigation regime 0.6 ET and 0.8 ET were recorded higher net return (Rs.48598/-and 46458/-ha -1 ) and B: C ratio (2.31 and 2.30) over irrigation regime 1.0 ET and surface method (control). Significantly higher net return (Rs. 50380/-ha -1 ) and B: C ratio (2.29) was recorded under application of 100% RDN&K over 75% and 50% RDN&K net return (Rs. 37538/-and 30680/-ha -1 ) and B: C ratio (1.79 and 1.53), respectively in the pooled analysis.
K e y w o r d sDrip irrigation, Bt cotton, nitrogen and seed cotton yield
SUMMARYField experiment was conducted at Agricultural Research Station, Borwat Farm, Banswara during Kharif -2012 to find out the optimum plant geometry and fertility levels for inter specific cotton hybrids. Sowing of RAHB-189 cotton hybrid gave significantly higher seed cotton yield (1798 kg ha -1 ) over DCH-32. The maximum seed cotton yield (1976 kg ha -1 ) was observed under plant geometry of 90 x 60 cm than closer plant geometry of 90 x 45 cm and wider plant spacing 90 x 90 cm. Though, yield attributing parameters such as bolls plant -1 and boll weight were statically improved in wider as compared to closer spacing it could be increase the seed cotton yield under sowing at 90 x 60 cm plant spacing. Among fertility levels, similar seed cotton yield was recorded with the application of 100 % RDF (1983 kg ha -1 ) and 125 % RDF (2018 kg ha -1 ) but both were significantly better than that of 75 % RDF and plant geometry 90 x 60 cm seemed to be ideal for inter specific hybrid cotton for realizing higher productivity under the specific agro climatic zone IV b.
Experiments were conducted to study the genetics and combining ability for yield and its attributes under Irrigated (E1) and Rainfed (E2) conditions using F1 hybrids derived from Line X Tester mating design by crossing eleven lines with three testers. Significant differences were observed among all the genotypes for all the traits in both E1 and E2 environments as well as in pooled analysis. The σ2gca/σ2sca ratio indicated predominance of non-additive gene action for all the characters in both environments. Therefore, this component of variance can be utilize in breeding programme through exploitation of heterosis and the selection process for identification of superior plant type should be postponed to further generations like F4 or F5. VL3001 and KACHU*2//WHEAR/SOKOLL was identified as good general combiner in irrigated condition (E1) and in rainfed condition (E2), respectively for maximum number of traits. Parent VL3001 was also identified as good general combiner for maximum number of traits in case of pooled analysis. Cross BECARD/KACHU × WH1080, BOW/VEE/5/ND/VG9144//KAL/BBB/YACO/4/CHIL/6/CASKOR/3/… × WH1080 and C306 × WH1142 was identified as good specific combination for maximum number of traits in irrigated condition (E1), rainfed condition (E2) and in pooled analysis, respectively.
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