Mitigate nitrate contamination in potato tubers and increase nitrogen recovery by combining dicyandiamide, moringa oil and zeolite with nitrogen fertilizer

Potato is considered a nitrogen (N) intensive plant with low N use efficiency (NUE). The current study introduced an excellent approach by combining dicyandiamide (DCD), moringa seed oil (MSO), or zeolite (ZE), fertilizer for maximizing potato tuber yields and NUE as well minimizing tubers nitrate (NO3?) accumulation. impact of these materials on soil availability gaseous emissions (NH3, N2O) was investigated under incubation conditions. A 2-year field experiment were carried out seven treatments [without (control), (350 kg N-urea ha?1 recommended dose; UreaRD), 75% dose DCD (Urea75%RD+DCD), Urea75%RD 2% MSO (Urea75%RD+MSO2%), 4% (Urea75%RD+MSO4%), 0.5 Mg ZE (Urea75%RD+ZER1), 1.0 (Urea 75%RD+ZER2)]. We also conducted 40-days trial the same treatments; however, urea added at rate 200 mg kg?1 all treatments, excluding control. addition DCD, MSO, conditions delayed nitrification process, thereby causing rise in NH4+-N content decrease NO3?-N content. Ammonia-oxidizing bacteria (AOB) inhibited (p ? 0.01) Urea+DCD, Urea+MSO4%, Urea+ZER2. highest indexes recorded treatment Urea75%RD+DCD. NO3- accumulation (567 NO3? kg?1) UreaRD. Whilest, lowest (81 cumulative N2O NH3 volatilization observed Urea+DCD Our findings demonstrated that could be reduced 25%, while increased acceptable limit content, resulting economical, agronomical, environmental benefits.