肥料分析用供試液調製の分解剤としてのイオン交換体の利用
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概要
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A reconnaissance survey was made by the authors on causes of the unproductivities of the paddy fields at Sasu Village in Tsushima. A considerable number of farmers at that village are of opinion that the infertility of soils due to the contamination of poisons from the mines which are situated at the upper reaches of the Sasu River. The main minerals of the mines are blends, galena and iron pyrite. Of soils, plants (barley) and waters from the fields, analyses were made as to their contents of zinc and lead. The results were obtained as follows : 1. Of the fields, affected most profoundly and left as fallow lands after harvesting rice crops, the soils had such a total content of zinc as much as 2,000 ppm. And about fourty percent of this zinc was in available form. It may be considered that the zinc in the soils has poising effects upon vegetation, when it attains its amount as much as this amount in available form. 2. The more the soil contained available zinc, the more the plants contained zinc and were suffered from detrimental effects on their growth. 3. Lead was contained in such quantities as it was likely injurious upon plant growth. 4. It was estimated 7.2kg of zinc and 0.1 kg of lead were discharged in to the river per day from an active mine at Sasu Section. 5. It was suggested that the poor paddy fields had been probably developed owing to the following facts : a) deposition of mine refuse on the field by the floods, b) absorption of zinc in the irrigated water by the soil, c) transportation of slime particles, suspended in the irrigation water, d) ascending of ground water by capillary action in the drought season, e) dressing of the compost made of plant materials grown on the affected lands.
- 社団法人日本土壌肥料学会の論文
- 1954-07-05
著者
関連論文
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