Fig. 4
From: Application of ionomics to plant and soil in fields under long-term fertilizer trials
Principal component analysis (PCA) of elements in leaves of maize. +NPK, complete fertilization; −N, fertilization without N; −P, fertilization without P; −K, fertilization without K; −NPK, no fertilization. For the PCA analysis, values of the translocation ratio for each element were used. a Scores on the first two components (PC1 and PC2). b Loading plot for PC1 and PC2