Influence of Controlled Drainage on the Groundwater Nitrogen and Phosphorus Concentration at Jointing-Booting Stage of Wheat

Figure 4

The change of the concentration of -N under controlled drainage at jointing-booting stage. The initial and final concentrations are the -N concentration in groundwater at the beginning of submergence and end of drainage, respectively. Vertical bars represent ± standard error (SE) of the mean.