Ajay Kumar et al J. Chem. Pharm. Res., 2010, 2(4):642-648_____________________________________________________________________________presynthesized l-menth<strong>on</strong>e to l-menthol are more active. The enzyme menthol dehydrogenase,which catalyses the NADPH dependent reducti<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> l-menth<strong>on</strong>e to l-menthol (10), seems to bemore synthesized or assembled in higher quantities in plants supplied with recommendedNPK+Zn indicating the enzyme activati<strong>on</strong> by additi<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> Zn. As such fertility levels bey<strong>on</strong>drecommended NPK might have retarded the rate <str<strong>on</strong>g>of</str<strong>on</strong>g> reducti<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> menth<strong>on</strong>e to menthol (enzymedeactivati<strong>on</strong>) <str<strong>on</strong>g>and</str<strong>on</strong>g> increased the rate <str<strong>on</strong>g>of</str<strong>on</strong>g> esterificati<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> menthol to menthyl acetate (enzymeactivati<strong>on</strong>), leading to decrease in menthol percentage (3).Ec<strong>on</strong>omics:Applicati<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> Zn, S or Zn +S with different NPK levels enhanced the net return compared t<str<strong>on</strong>g>of</str<strong>on</strong>g>ertility levels al<strong>on</strong>e ( Table-3). Additi<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> Zn during both the years <str<strong>on</strong>g>and</str<strong>on</strong>g> S during 2000 al<strong>on</strong>gwith recommended NPK gave more net return compared to their additi<strong>on</strong> with 130% <str<strong>on</strong>g>of</str<strong>on</strong>g>recommended NPK. Recommended NPK al<strong>on</strong>g with Zn +S gave highest net return (77998 <str<strong>on</strong>g>and</str<strong>on</strong>g>80338) followed by130% <str<strong>on</strong>g>of</str<strong>on</strong>g> NPK al<strong>on</strong>g with Zn+S compared to remaining treatments duringboth to years.Future Research NeedTo increase the <strong>oil</strong> <str<strong>on</strong>g>and</str<strong>on</strong>g> menthol c<strong>on</strong>tent in M arvensis, critical time <str<strong>on</strong>g>of</str<strong>on</strong>g> nutrient uptake <str<strong>on</strong>g>and</str<strong>on</strong>g> itscorrelati<strong>on</strong> with <strong>oil</strong> <str<strong>on</strong>g>and</str<strong>on</strong>g> menthol c<strong>on</strong>tent should be determined. 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