Mineral concentration in water on the livestock farm on hilly land [in Japan]
1991
Kishida, Y. (Okayama Univ. (Japan). Faculty of Agriculture) | Okabe, T. | Inoue, R.
Tsudaka Livestock Farm founded in 1978 had been obtained the drinking water for the cattle from a well on the farm. then the farm water supply system, in which water was pumped up from the well to reservoirs, stored in the reservoirs and supplied to the stalls (Fig. 1) was built. Low fertility of breeding cows was one of the problems on the farm during the farm-water was used. After the city water system began supplying water in 1987, fertility has been clearly improving. To find the cause, mineral in well-water, farm-water and city-water were determined by atomic absorption spectrometry. The average iron concentration of the well-water and farm-water was 25.5 and 1.32 ppm. respectively, which was about 500 and 20 times of city water. Also the average manganese concentration of well-water and farm-water was 4.31 and 3.32 ppm., respectively, which was about 2,000 times of city water. The iron concentration of the farm-water was much less than that of well-water which was the source of the water supply. Calcium, magnesium, copper and zinc concentrations of the farm-water were higher than the well-water. Those results show that iron of the well-water was precipitated in the reservoir, and the farm-water had dissolved such minerals as calcium, magnesium, copper and zinc from the old sediment accumulated since the farm was built. The iron concentration of the well-water decreased steadily from 45.6 to 9.7 ppm. during sampling term. It is suggested that precipitous decrease of iron in the well-water was caused by the construction of new Okayama Airport near the farm
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