Nitrogen Management :: Environment, Agriculture, Crop Production

Nitrogen management is critical component for sustainable crop production, it is desirable to adapt N fork out with crop N use to maximize efficiency. In Egypt, due to intense cultivation of high give ining crop varieties, the nutrients supplying capacity of smut is declining. Producers tend to apply insurance application of N to make them liveliness more confident about N sufficiency. These practices may lead to everywhere application of N fertilizer and result in groundwater pollution by nitrate (NO3) due to the elevated levels of NO3 in the soil profile (Asadi et al. 2002). agreely, search for alternative N sources and maintaining long term soil fertility and sustainability are a priority for studying. Cultivar performance varies as related to genotype environmental interactions (Eberhart and Hallauer 1967). In general, corn hybrids are highly productive and respond to N application, however their ability to maintain getting even under water or N stress ar e different (ONeill et al. 2004). Nitrogen availability represents a major limiting corn grain yield under intensive cropping system. The identification of hybrids response to different combination of N rates and bio-fertilizers could deoxidise the amount of applied N and increase efficiency. Several research in the literature document significant cultivar N interaction differences in ontogeny such as LAI and lay out weight and yield traits (Ahmed 1990 Tollenaar and Wu 1999 and Hokmalipour 2010). find particularised hybrids response to N inputs would make a great contribution to plant breeding for sustainable agriculture (Presterl et al. 2002). It is clear that current unsuitable handling of N fertilizers may be responsible for NO3-N contamination of both break through water and soil water (Wang et al. 1996). Yield goal as N based recommendation usually represent large geographic areas. According to (MOA 2004) they provide a N recommendation for corn that is a one-dim ensional function of yield goal. Although these recommendations are generally suitable, they may lead to everywhere application of N as hybrids and environment change. Corn grain yield has been significantly increased by varying N rate from xcl to 380 kg N ha-1 (El-Hendawy et al. 2008). A positive response for grain yield has been reported by (Halverson and Reule 2006) up to 285 kg N ha-1 while maximized at 180 kg N ha-1 in another study (Lamm et al. 2001). Determining N recommendation could be further improved by considering field-specific soil-crop-climate conditions on with different hybrids and Bio-fertilizers effects.