Optimal Nitrogen Fertilization to Reach the Maximum Grain and Stover Yields of Maize (Zea mays L.): Tendency Modeling

Utilization of maize stover to the production meat and milk saving grains for human consumption would be one strategy optimal usage resources. Variance tendency analyses were applied find nitrogen (N) fertilization dose (0, 100, 145, 190, 240, 290 kg/ha) forage (F), (S), cob (C), grain (G) yields, as well grain-to-forage, cob-to-forage, cob-to-stover ratios (G:F, C:F, C:S, respectively). The study was performed in central Mexico (20.691389° N −101.259722° W, 1740 m a.m.s.l.; Cwa (Köppen), 699 mm annual precipitation; alluvial soils). N-190 N-240 improved individual yields most. Linear quadratic models CDM, GDM, G:F ratio had coefficients determination (R2) 0.20–0.46 (p < 0.03). Cubic showed R2 = 0.30–0.72 0.02), best G:F, C:S DM (R2 0.60–0.72; p 0.0002). Neither SHB nor SDM negatively correlated with CDM or GDM (r 0.23–0.48; 0.0001). Excess negative effects on forage, stover, cobs, but increased proportion ratios, without production.