Fig. 2
From: Application of ionomics to plant and soil in fields under long-term fertilizer trials
Fresh weights of maize shoots grown in a long-term fertilizer experiment field at an early flowering stage. +NPK, complete fertilization; −N, fertilization without N; −P, fertilization without P; −K, fertilization without K; −NPK, no fertilization. Values are means (n = 3), and bars indicate ± standard errors. Different letters indicate statistically significant difference (P < 0.05) using Tukey’s multiple comparison test following a one-way ANOVA