Quality of Irrigation Water in Fukuoka Prefecture

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  • 福岡県における農業用水の水質
  • フクオカケン ニ オケル ノウギョウ ヨウスイ ノ スイシツ

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Abstract

Chemical properties of irrigations, reservoirs and ground waters in Fukuoka prefecture were measured from 1986-1988, to reveal the overall status of the agricultural water quality. The numbers of places from where the waters were sampled were 53 for irrigation, 6 for reservoir and 3 for ground water. 1) In the irrigations, 76% of waters exceeded the quality standard value of T-N in agricultural water ; 23% exceeded the standard value of COD. 2) In the irrigations that stemmed from the middle and lower reaches of the Chikugo or the Yabe river, EC, COD and T-P values increased as the waters went down the rivers. Organic matters contents in the water of the lower reaches of the rivers were among the highest in Fukuoka prefecture. 3) In the irrigations and the ground waters in middle and lower reaches of the Chikugo river, the water quality declined after transplanting of rice. Fertilizer applied to the paddy fields may have run off and caused the water pollution. 4) On the outskirts of Fukuoka city, organic matters contents were high in the water of the irrigations. As positive correlations were found among COD, T-N, T-P and Cl^-, it was estimated that the water pollution by organic matters in their irrigations was caused by domestic waste water discharge. 5) Values of EC in the water of irrigations and reservoirs around the Onga river basin were generally high owing to the flowing-in of water from abandoned coal mines. 6) Values of pH in the water of reservoirs in the plains were higher than those of the surrounding irrigations. Pollution by organic matters in the reservoirs was apparent. 7) Pollution by organic matters was not found in the ground waters, though the concentrations of T-N and NO_3-N in the water were higher than those in the surrounding irrigations.

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