Figure 2. The total nutrient uptake (A), grain nutrient uptake (B) and nutrient harvest index (C) of rice under the different nitrogen fertilizer management strategies.

N₁₀₀, 100% conventional nitrogen (N) fertilizer (conventional compound fertilizer and urea); N₇₅+OICF₂₅, 75% conventional N fertilizer with 25% organic–inorganic compound fertilizer; N₅₀+OICF₅₀, 50% conventional N fertilizer with 50% organic–inorganic compound fertilizer; OICF₁₀₀, 100% organic–inorganic compound fertilizer; SRCF+U, slow-release compound fertilizer with urea; CF+SCU, compound fertilizer with sulfur-coated urea. Vertical bars indicate the standard deviation of mean (n = 3). Means within the same column followed by different letters are significantly different at the 0.05 level.