Management of Cotton Crop Under High Cotton leaf curl virus Attack
The objective of this study was to compare yield, yield components and fiber traits of different genotypes/varieties under different plant spacings and nitrogen fertilizer levels. Field experiment was conducted during 2006-2007 to evaluate the effect of genotype, plant spacing and nitrogen fertilizer on cotton. Five genotypes (MNH-786, MNH-789, MNH-6070, CIM-496 and BH-160), three plant spacings (15, 30 and 45 cm) and three nitrogen fertilizer levels (6.5, 8.6 and 11 bags of urea ha-1) were studied. Results showed that significant differences exit for plant height, no. of bolls m-2, seed cotton yield kg ha-1 due to genotypes, interaction of genotype and plant spacing and nitrogen fertilizer levels. Where as boll weight (B. wt.), Ginning out turn percentage (G.O.T %), staple length (SL) and fiber fineness were not affected significantly by the plant spacing, nitrogen fertilizer but effect due to genotype was significant for these traits. CLCuV (Cotton leaf curl virus) infestation % varied significantly due to genotypes while all other factors i.e., plant spacing and nitrogen fertilizer has non-significant effect. As the major objective of cotton cultivation is lint production for country and seed cotton yield for the farmers, the genotypes grown in narrow plant spacing 15 cm and higher nitrogen fertilizer level 11.0 bag of urea ha-1 produced maximum seed cotton yield under higher CLCuV infestation % (CIM-496, MNH-789 and BH-160) while the variety MNH-6070 gave maximum yield under 30 cm plant spacing and 8.6 bag of urea ha-1 as the 2.3% CLCuV infestation was observed upon this variety. From the present study it is concluded that the genotypes that are severally affected by CLCuV can be managed with increasing plant population and nitrogen fertilizer to achieve optimum seed cotton yield.
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