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中海越洋:老师,你好,我发现现在好多冲施肥厂家在产品中加腐植酸钠,但是钠离子应该对土壤是有害的,请问老师:这种产品长期在保护地蔬菜使用危害多大?在露天果树上应用的话会有什么危害?谢谢 (2012-12-28 15:19)
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