Unverified87% confidenceDecision RuleTime unknown
水溶性是核心指标：优质磷酸二氢钾溶于水后应完全澄清无沉淀，若溶解后杯底有白色残渣或浑浊，说明纯度不足或掺有难溶的磷矿粉，叶面吸收率会大打折扣
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