Fig. 5From: Determining optimal mulching, planting density, and nitrogen application to increase maize grain yield and nitrogen translocation efficiency in Northwest ChinaNitrogen uptake at physiological maturity in different maize organs as affected by mulching (no mulch, plastic mulch), planting density (55,000 seeds ha− 1, 90,000 seeds ha− 1), and N fertilizer application rate (N0, 0 kg N ha− 1; N120, 120 kg N ha− 1; N240, 240 kg N ha− 1; N360, 360 kg N ha− 1) in 2015 (a, b), 2016 (c, d), and 2017 (e, f). Bars represent the mean + one standard error of the mean (n = 4)Back to article page