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硫硅配施对土壤铜形态和水稻吸收铜的影响

DOI: 10.11654/jaes.2013.09.015, PP. 1806-1813

Keywords: 水稻,,,,形态

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Abstract:

铜是江西省农田中主要重金属污染物之一,为减轻和控制铜对水稻生长的危害,提高水稻产量和品质,通过盆栽试验,研究不同硫肥(0、30、60、90kg·hm-2,以S计)与硅肥(0、0.5、1.0、1.5g·kg-1,以Si计)配施对水稻吸收铜及土壤铜形态的影响。结果表明:(1)在铜污染的农田中施用硫、硅肥都能降低土壤中酸可提取态Cu含量,提高残渣态Cu的含量,但土壤铁锰氧化物结合态Cu和有机物/硫化物结合态Cu含量因硫、硅用量不同而存在差异;(2)硫、硅各处理可通过促进铜在水稻根部累积或减少土壤有效态Cu的含量,减少铜在茎、叶、糙米中的吸收累积。从对糙米中铜含量及产量的影响可知,硫用量30kg·hm-2和硅用量1.0g·kg-1互作效果最佳,在生产上具有应用前景。

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