Figure 3 : Maize grain yield and apparent nitrogen recovery efficiency (REN indicates the percentage of fertilizer N recovered in aboveground plant biomass) in the two years at Shangzhuang (SZ) and Quzhou (QZ). Different letters above the bars indicate the significance under P < 0.05.

From: A new urease-inhibiting formulation decreases ammonia volatilization and improves maize nitrogen utilization in North China Plain

Figure 3