| Title |
Variations of Dissolved and Total Phosphorus Concentrations in Irrigation, Flooding, and Drainage Water of Paddy Fields |
| Authors |
최동호 ( Dongho Choi ) ; 조소현 ( Sohyun Cho ) ; 정재운 ( Jaewoon Jung ) ; 박현규 ( Hyunkyu Park ) ; 최우정 ( Woojung Choi ) ; 윤광식 ( Kwangsik Yoon ) ; 김영석 ( Youngsuk Kim ) |
| DOI |
https://doi.org/10.15681/KSWE.2017.33.4.434 |
| Keywords |
Flooding water; Irrigation water; Phosphorus behavior analysis; Runoff |
| Abstract |
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 from 2008 to 2010. The variation of phosphorous form within hydrologic cycle around the rice paddy field was investigated using the ratio of PO4-P to TP. In addition, the correlation between pH, EC, and DO in flooding water was analyzed and the factors affecting phosphorus form in paddy field 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 assumed to be decreased by dilution due to irrigation and rainfall. On the other hand, the ratio of PO4-P to T-P was lower in flooding water than those of irrigation 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. The similar proportions of PO4-P to T-P in flooding water and runoff suggest that the form of phosphorus outflowed from the paddy is influenced by the form of phosphorus in the flooding water of paddy field. In addition, DO concentration in flooding water showed negative correlation with the concentrations of PO4-P and T-P. The effort to survey frequent irrigation water quality data is required for the analysis of phosphorus behavior in the paddy water system since concentration of phosphorous and DO in irrigation water would influence rhe form of phosphorous in flooding water and subsequent runoff. |