Effects of Controlled Irrigation and Drainage on Nitrogen and Phosphorus Concentrations in Paddy Water

Figure 3

Change of TP concentration at each stage. FDTF indicates first drought and then flooding; FFTD indicates first flooding and then drought. 1st, 2nd, and 3rd indicate the concentration on the first, third, and fifth day of flooding for the FFTD treatments and at the water level of 0 mm, −250 mm, and −500 mm for the FDTF treatments. 4th, 5th, and 6th indicate the concentration on the first, third, and fifth day of flooding for the FDTF treatments and at the water level of 0 mm, −250 mm, and −500 mm for the FFTD treatments. Vertical bars represent standard error of the mean.