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Nitrogen Concentration at Maturity—An Indicator of Nitrogen Status in Forage Maize

Inst. of Crop Sci. and Plant Breeding, Grass and Forage Sci./Organic Agric., Christian-Albrechts-Univ. Kiel, Olshausenstr. 40, D-24098 Kiel, Germany

View larger version (62K): [in a new window]   Fig. 1. Locations of the field experiments in Schleswig-Holstein and Lower Saxonia, Germany: Schuby (1), Ostenfeld (2), Karkendamm (3), Bremervoerde (4), Bramstedt (5), Berkhof (6), Dasselsbruch (7), Celle (8), and Markhausen (9).

View larger version (45K): [in a new window]   Fig. 2. Relationship between whole-crop N content [g N kg–1 dry matter (DM)] at silage maturity and DM yield (t DM ha–1) at each site-year. Parameters of the quadratic-plateau function are given if model fit was successful, namely the threshold N concentration (Ncth) where the quadratic part passes into the plateau and the corresponding plateau yield wmax. Points are treatment means over three or four replicates. Control treatments (0 kg N ha–1) are displayed by open symbols. The critical N concentration at silage maturity of 10.5 g N kg–1 DM is represented by dashed vertical lines. M.F. = model failed to fit, N.A. = data excluded due to drought, and N.P. = plateau estimation failed.

View larger version (30K): [in a new window]   Fig. 3. Relationship between relative dry matter (DM) yield and N concentration (g N kg–1 DM), and corresponding regression statistics; the dashed lines indicate the critical N concentration at silage maturity (CNC), i.e., the N concentration at maximum relative yield.

View larger version (25K): [in a new window]   Fig. 4. Relationship between dry matter (DM) content (g kg–1) and N content (g N kg–1 DM) of maize silage samples analyzed by three Agricultural Analytical and Research Institutes (LUFA), located in northern Germany. The coefficient of correlation is denoted by r, and the critical N concentration (CNC) (+SE) is represented by dashed lines.