Unverified82% confidenceTradeoffTime unknown
叶面补铁见效快（3-7天返绿）但持效短，只能应急；根本解决碱性土缺铁需改良土壤pH或根施EDDHA-Fe，叶面肥治标不治本
1
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82%
Confidence
Long-term
Relevance
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Unverified缺铁黄化（新叶发黄叶脉仍绿）才需补铁；若老叶先黄多为缺氮/镁，此时用铁肥无效反而增加叶片负担81% similarUnverified缺铁性黄化（新叶叶脉绿、叶肉黄，从顶部新叶开始）应选螯合铁EDTA-Fe或EDDHA-Fe，而非硫酸亚铁，螯合态在偏碱性土/水质硬地区不易失效74% similarUnverified螯合铁选EDTA-Fe适用于土壤pH≤6.5的酸性环境，pH>6.5时EDTA会释放铁并被固定失效，此时应选DTPA-Fe（稳定至pH7.5）或EDDHA-Fe（稳定至pH9）66% similarUnverified硫酸亚铁（FeSO4）不属于螯合铁，叶面喷施后遇空气快速氧化成三价铁沉淀，吸收率低且易在叶面留锈斑，追求速效应选螯合态而非硫酸亚铁66% similarUnverified不建议把果泥当作补铁主力，果泥含铁量极低，6月龄后铁需求激增（约11mg/天），应优先选高铁米粉、肉泥、肝泥等富铁辅食，果泥仅作补充维生素和口味过渡66% similar
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