Topic > A different combination of N rates and biofertilizers could reduce the amount of N applied and increase efficiency. Numerous studies in the literature document significant differences in cultivar × N interaction in growth, such as LAI, plant weight, and yield characteristics (Ahmed 1990; Tollenaar and Wu 1999; and Hokmalipour 2010). Determining the specific response of hybrids to N inputs would make a great contribution to plant breeding for sustainable agriculture (Presterl et al. 2002). It is clear that current inadequate N fertilizer management may be responsible for NO3-N contamination of both surface water and soil. water (Wang et al. 1996). The performance target as an N-based recommendation usually represents large geographic areas. According to (MOA 2004) they provide an N recommendation for corn which is a linear function of the yield objective. While these recommendations are generally appropriate, they could lead to excessive application of N as hybrids and environmental changes. Maize grain yield was significantly increased by varying the N rate from 190 to 380 kg N ha-1 (El-Hendawy et al. 2008). A positive response for grain yield was reported by (Halverson and Reule 2006) up to 285 kg N ha-1 while it was maximized at 180 kg N ha-1 in another study (Lamm et al. 2001). The determination of N recommendation could be further improved by considering field-specific soil-climate conditions along with different hybrids and biofertilizer effects.