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Abstract atrinal, naphthalenear:ptir: ar:id (NAA) and kinetin as well as two foliar fertilizers,Grpellzit and Bayfolan at different concentrations and at diffcr!:,”: time of application as well on the vegetative growth alld the volatile oil production of sweet mr:lrjoram plants (HajorClnrl hortensis) ,Moench. Therefore, two separate split plot experiments with four replications were conc1llcted. 1’hp combined effect of the growth reguL:itors and the foliar fertilizers WrlS Cllso studied jn Cl separate exper iment. growth regulators rltrinCll,NAA and kinetin on marjoram plants. lit r i n a I \IT a sap p 1 ,j e d. a t. .7. 0 0 , 4 0 n and 6 0 0 P pm. N A 1\ con c e n t rat ion s were 100,200 and 30n ppm,”Whilf> kinetin was applied at 25, 50 and 75 ppm. 1 n the seconcl exper i mPllt the p] ants were sprayed wi th Greenzjt or Bayfolall, both at 2 and 4 mIlL, \IerF~ the suh. plots). Thp. firc;t group (GI) included the plants treated ~s foli~r sprays with these growth regulators or the foliar fertilizers three times at three week intervals before the first cut of. thp. herb. While in the second group (GIll, the pl~n~s rereive~ the sam0 three sprayes before the first rut and rt single spray !>p[orf:> the second .=tnd third cuts,i.e., the plants treated before e.=tch cut. different comhinr.ltions of the growth regulators and the fol iar fertilizer, three times !>efore the first cut of the herb ~nd a single spray of e.=!ch was applied befor the second and followed in this experiment. The foliar fertilizer treatments were the main plots i’lnd thp growth rrguli’ltor treatments were tr i~J Grppnzit and Bayfolan were ~trini’ll w.=ts sprayed at 200 and 400 i’lcid was applied at 100 and 200ppm applied at 2 and 1 mIlL. ppm. Naphthaleneacetic In all experiments three cuts were taken and the foll owing data were recorded: Plant height, basal branch number, lateral branch number, herb dry weight, leaves dry weight. |