extremely significantP ≤ 0.01
Results Grain Yield and Its Components As shown in Table 3 , N rate had extremely significant effects on grain yield and its components of summer maize ( P ≤ 0.01).
Results Grain Yield and Its Components As shown in Table 3 , N rate had extremely significant effects on grain yield and its components of summer maize ( P ≤ 0.01).