Fig 1.
The monthly mean rainfall and mean temperature during the wheat growing season from 2014 to 2015.
Table 1.
Effects of N fertilizer placement and N rate on grain yield, straw yield, aboveground biomass, root biomass and harvest index (HI) of winter wheat.
Table 2.
Effects of N fertilizer placement and N rate on N content and N accumulation in grain, straw and roots of winter wheat.
Table 3.
Effects of N fertilizer placement and N rate on distributions of urea-15N in wheat plants.
Table 4.
Effects of N fertilizer placement and N rate on N derived from fertilizer (Ndff) and from soil (Ndfs) of wheat plants.
Fig 2.
The distribution of urea-N residual in soil at (a) 60, (b) 150 and (c) 240 kg ha-1. ** Significant at p<0.01, * Significant at p<0.05, NS, not significant.
Fig 3.
Percentages of N recoveries in wheat, and in soils (0–80 cm) and the unaccounted N losses.
Table 5.
Effects of N fertilizer placement and N rate on urea-15N recovery in wheat.