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作者等从非洲和东南亚(包括中国广东省和台湾省沿海冲积的咸酸田和冷酸田)采集各种类型铁中毒水田的土壤样本,比较共物理化学特性,又采集具有明显铁中毒症状的叶片进行养分含量分析。试验结果说明:铁中毒水田土壤的共同特点是:阳离子交换容量低,有效磷缺乏,交换性钾和钙含量也低。水浸液土壤pH变化很大(3-7.2),活性铁含量的变化也大。由此可以说明,酸性强和活性铁含量高,都不是引起水稻铁中毒的根本原因。
The authors collected soil samples of various types of iron-contaminated paddy fields from Africa and Southeast Asia (including alluvial saline fields and cold acid fields along the coasts of Guangdong Province and Taiwan Province of China), compared their common physico-chemical characteristics with those with obvious symptoms of iron poisoning Leaf nutrient content analysis. The test results show that the common characteristics of paddy soils contaminated by iron are: low cation exchange capacity, lack of available phosphorus, exchangeable potassium and low calcium content. Soil pH in aqueous extracts varies widely (3-7.2) and changes in active iron content are also large. It can be shown that high acidity and high activity of iron are not the root causes of iron poisoning in rice.