The Change in the Quality of Irrigation Water in Ten Years in Fukuoka Prefecture (Modelling, Information Technology and Environment)

Japanese Journal of Crop Science

Kazuhiro KADOSHIGE¹  Kazue MIZUTA¹  Toshihiko HIRANO¹ 

关键词: COD;    化学的酸素要求量;    EC;    潅漑水;    Irrigation;    水質汚染;    water;    全窒素;    Polluted water;    全リン;    Total nitrogen;    電気伝導率;    Total phosphorus;   

DOI  :  10.1626/jcs.70.255

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The chemical properties of irrigation waters in Fukuoka Prefecture were examined from 1986 to 1988. The irrigation waters were sampled at 46 place several times during the period from puddling of paddy fields to the ripening of rice plants. Among the 232 waters sampled, the waters showing a higher value than the standard for agricultural water in pH, EC, COD and T-N were 28%, 11%, 46% and 87%, respectively. These values were generally higher than those reported in other prefectures in Japan. COD values were higher in Chikugo and Iizuka-Yahata and T-N was higher in Chikugo, a rural area in Fukuoka Prefecture. These values declined at the time of rice-transplanting, suggesting the run off the water from the paddy fields. COD was highly correlated with T-P, showing that the water pollution by organic matters was caused by the discharge of waste water containing a high amount of P. It is considered that reduction of the discharge of waste water which contains P is especially necessary for preventing the pollution. Comparison of the values obtained in 1986∼88 with those in 1991∼93 in Fukuoka Prefecture showed that pH, COD, T-N and T-P increased in almost all areas.

【 授权许可】

Unknown