Influence of nitrogen and nitrogen carrier on herbage, oil yield and nitrogen uptake of patchouli [Pogostemon cablin (Blanco) Benth.] in semi-arid tropical condition

Abstract

A field experiment was conducted at Bangalore (Karnataka) in a semi-arid tropical climate ofSouth India to study the influence of two nitrogen levels (100 and 200 kg N ha-1) and threenitrogen carriers (prilled urea, ammonium sulphate and dicyandiamide (DCD)-coated urea)on herbage, oil yield, nitrogen uptake and oil quality of patchouli [Pogostemon cablin (Blanco.)Benth.] grown on red sandy loam soil.  Nitrogen @ 200 kg ha-1 and DCD-coated urea producedmaximum herbage, oil yield, nitrogen uptake and benefit : cost ratio.  The oil content variedfrom 2.48% to 2.60% and was not influenced by nitrogen level and carrier.