Elucidation of Advantageous Effect of Applying Advanced Treated Wastewater to Rice Plant Growth Using Stable Isotopes

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Non-diluted actual advanced treated wastewater with the stable isotopes (^<15>N,P^<18>O_4) as the tracer was applied to the rice plant in pot-scale experiments. The experiments were conducted under the variety of condition of fertilizer application rate, kind of soils, and soil permeability. In the research, the nitrogen and phosphorus dynamics in the pots and the effect of the treated wastewater to rice plant growth were elucidated. The effect of cations (K, Na, Ca, Mg) and SO_4 in the treated wastewater was also defined. These results show the significant advantageous effect of applying the advanced treated wastewater to rice plant and the suitable condition of the application to obtain the effect.