Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2003.1574.1577AliMd. AfsarHossainMostofa AmranMondalMd. F.FarooqueA. M.122003618A study was conducted at the Horticulture Farm of Bangladesh Agricultural University, Mymensingh. The experiment was conducted to study the effect of nitrogen and potassium on quality and yield of carrot root. The experiment involved four doses of nitrogen, namely 0, 100, 150, 200 kg ha 1 and four doses of potassium namely, 0, 150, 200, 250 kg ha 1. Nitrogen was assigned to the main plots and potassium to the sub-plots. Root yield increased progressively and significantly with the increased application of nitrogen and potassium. Application of N200K250 increases the yield 324% over the control. The highest carotene content (20.47 μ g 1) was recorded in the plants received 200 kg ha 1 nitrogen and the lowest carotene content (9.50 μ g 1) from the plant grown without nitrogen. Potassium also showed significant effects on root carotene content being 21.85 μ g 1 in plants fertilized with 250 kg ha 1 potassium and 9.45 μ g 1 in the plants without potassium. The maximum carotene content (33.43 μ g 1) was obtained from the plant under treatment N200 K250 and minimum (4.47 μ g 1) was obtained from plants under control treatment. The highest reducing sugar content (573.9 mg g 1) was found from the plants receiving 200 kg ha 1 nitrogen and the lowest (450.6 mg g 1) from the plants receiving no nitrogen. Potassium had adverse effects on sugar accumulation in the carrot root. The lowest (287.7 mg g 1) reducing sugar content was obtained from K250 and highest reducing sugar content (704.4 mg g 1) recorded in plants grown without potassium. The highest (755 mg g 1) reducing sugar content was found in plants grown without nitrogen and potassium and lowest (329.3 mg g 1) were found in plants under treatment N200 K250. Root cracking was increased progressively and significantly with increasing application of both nitrogen and potassium but their interaction effects was insignificant.]]>Alim, A.,19741st Edn.,pp: 9pp: 9Anonymous,1991pp: 7pp: 7Barnes, N.C.,1936pp: 186pp: 186Bose, T.K. and M.G. Som,1990pp: 408-442pp: 408-442Evers, A.M.,198961714Goodman, O.,195350104128Hipp, B.W.,1978134344Mahadevan, A. and R.R. Sridhar,19822nd Edn.,pp: 463pp: 463Matev, J.,1970193543Michalik, H.,198528141163Page, A.L., R.H. Miller and D.R. Keeney,19892nd Edn.,Polach, J.,19821982FAO,2001