Phosphorus concentrations in irrigation, flooding, and drainage water of Paddy fields and their relationship:-





phosphorous from paddy the field could affect the adjacent The runoff export ofcould affect the adjacent water environment . In order to understand the characteristics of phosphorus in the paddy field, this study analyzed PO4-P and T-P concentrations of irrigation water, flooding water, and runoff through field monitoring.





pH, EC, and DO in flooding water was analyzed and the factors affecting phosphorus behavior in paddy water were investigated. fig. Phosphorus concentrations in irrigation, flooding, and drainage water of Paddy fields In addition, the correlation betweenin flooding water was analyzed and the factors affecting phosphorus behavior in paddy water were investigated.





The concentration of T-P in flooding water was high during the survey period, and the concentration of T-P in runoff was decreased by dilution by irrigation and rainfall.





P04-P to T-P was lower than that of irrigation water in flooding water and runoff, which was interpreted to be due to the fact that the phosphorus fertilizer was applied in the paddy field but the On the other hand, the ratio ofwas lower than that of irrigation water in flooding water and runoff, which was interpreted to be due to the fact that the phosphorus fertilizer was applied in the paddy field but the adsorption was rapidly occurred to the paddy field by the soil





A similar ratio of P04-P to T-P in flooding water and runoff suggest that the distribution of phosphorus outflowed from the paddy is determined by the distribution of phosphorus in the flooding water of the paddy field. Furthermore, the ratio in flooding water was affected by the DO level of irrigation water.





The soluble form of phosphorous could be readily available for an algal bloom. Therefore, irrigation water quality would play an important role in sound ecosystemconservation





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