CORESTA Meeting, Agronomy/Phytopathology, Montreux,1997, AP23

Response of some exotic varieties of flue-cured tobacco to different production practices in light soils of Andhra Pradesh (India)

UMAMAHESWARA RAO M.; SANNIBABU M.
Central Tobacco Research Institute (CTRI), Rajahmundry (A.P.) India
Field experiments were conducted to study the influence of time of planting and response to organic manures, inorganic nitrogen and topping levels on yield and quality of F.C.V. tobacco grown on light sandy loam soils under irrigated conditions. Results of the experiment revealed that incorporation of green manure in situ or application of organic manure to supply 30 kg N/ha, in combination with 80 kg inorganic N/ha enhanced the tobacco yields without detrimental effect on the leaf quality. As regards time of planting, significant difference has been established for green, cured and grade index between different dates. Planting on 30th September and 15th October were significantly superior to late planting on 30th October. The first date of planting on 30th September was found to be the best time of planting among three dates tested in the trial. In respect of varieties, no significant differences were observed between the varieties tested except in grade index. The performance of the exotic introductions viz K326, K149 and K394 exhibited their superiority over the standard checks 16/103 and CM-12 in yield and quality. The chemical composition and quality indices of the exotic varieties are within the acceptable range. Among nitrogen levels, application of 80 kg N/ha was found to be the optimum. Topping the plants at 22 leaves stage was found superior over 18 leave topping though the yield differences are not significant.