Major nutrient uptake by weeds and crop in herbicide applied transplanted rice

Abstract

An experiment was conducted during kharif, 2013 and 2014 at Hyderabad with 14 treatments consisting of pre emergence application of pretilachlor 625 g, pyrazosulfuron 20 g and bensulfuron methyl 60g+pretilachlor 600 g at 3 DAT, penoxulam 22.5 g and cyhalofop-p-butyl 100 as early post emergence at 15 DAT, bispyribacsodium 25 g and pretilachlor 750 g their combinations with ethoxy sulfuron 18.75g, metsulfuron methyl+ chlorimuron ethyl 4g, azimsulfuron 35g, pyrazosulfuron 20 g ha-1 at 3DAT followed by hand weeding at 25 DAT, hand weeding twice at 25 and 45 DAT and weedy check in RBD replicated thrice. During both years of investigation, Significantly the higher nitrogen, phosphorus and potassium uptake of crop was observed with T13 treatment (hand weeding twice at 25 and 45 DAT) and was comparable with T4 (pyrazosulfuron ethyl @ 20 g a.i. ha-1 at 3 DAT followed by manual weeding at 25 DAT), T12 (pretilachlor @ 750 g a.i. ha-1 as PE at 3 DAT followed by metsulfuron methyl + chlorimuron ethyl @ 4 g a.i.ha-1 as PoE at 25 DAT) and T10 treatments (bispyribac sodium @ 20 g a.i. ha-1+ metsulfuron methyl + chlorimuron ethyl @ 4 g a.i. ha-1 as PoE at 25 DAT).