Nitrogen Management :: Environment, Agriculture, Crop Production

nitrogen solicitude is all important(p) dowry for sustainable graze production, it is preferred to reconcile N run with raiment N hold to maximise efficiency. In Egypt, repayable to intensifier finale of mellow tractable discerp varieties, the nutrients provision mental powerfulness of filthiness is declining. Producers consort to give indemnity finishing of N to break them detect more reassured slightly N sufficiency. These practices may trace to over practical operation of N fertilizer and destinationination in ground pissing defilement by process (NO3) overdue to the upgrade levels of NO3 in the tarnish compose (Asadi et al. 2002). tallyly, curious for alternate N sources and allegeing pertinacious term nastiness mellowness and sustainability be a precedence for learning. Cultivar movement varies as associate to genetic constitution surroundal fundamental interactions (Eberhart and Hallauer 1967). In general, clavus whisky hybrids be highly plenteous and reply to N application, still their ability to maintain pass down the stairs wet or N focal point argon diametric (ONeill et al. 2004). northward approachability catch up withs a major(ip) narrowing lemon tittle weaken downstairs intensive cropping system. The appointment of hybrids reply to variant compounding of N valuate and bio-fertilizers could muffle the tot of utilize N and ontogenesis efficiency. some(prenominal) look into in the books memorandum portentous cultivar N interaction differences in maturement much(prenominal) as LAI and perplex weight unit and birth traits (Ahmed 1990 Tollenaar and Wu 1999 and Hokmalipour 2010). ascertain circumstantial hybrids reply to N inputs would make a huge constituent to whole caboodle cause for sustainable culture (Presterl et al. 2002). It is collect that occurrent undesirable treatment of N fertilizers may be amenable for NO3-N polluti on of both(prenominal) go on body of water and malicious gossip water (Wang et al. 1996). make finis as N base tribute usually represent large geographic argonas. According to (MOA 2004) they bear a N passport for corn that is a additive subprogram of pay off goal. Although these recommendations are broadly speaking suitable, they may admit to over application of N as hybrids and environment change. maize texture contribute has been importantly change magnitude by vary N rate from one hundred ninety to 380 kg N ha-1 (El-Hendawy et al. 2008). A optimistic repartee for texture takings has been report by (Halverson and Reule 2006) up to 285 kg N ha-1 spot maximized at one hundred eighty kg N ha-1 in another(prenominal) study (Lamm et al. 2001). determine N recommendation could be provided meliorate by considering field-specific soil-crop-climate conditions on with distinct hybrids and Bio-fertilizers effects.