{"title":"Calcium as a confounding variable in phosphorus attribution: A commentary on Hu et al. (2025)","authors":"Xiaoming Zou","doi":"10.1016/j.seh.2025.100172","DOIUrl":null,"url":null,"abstract":"<div><div>This letter questions the sole attribution of enhanced plant growth and arsenic accumulation to P availability in Hu et al. (2025), arguing that Ca, a co-delivered nutrient in all treatments, may be a confounding factor. Emerging evidence highlights Ca's critical role in plant growth, water use efficiency, and arsenic uptake, necessitating careful consideration in experimental designs. The letter recommends experimental designs that disentangle P and Ca effects to strengthen the mechanistic understanding of nutrient-driven phytoremediation.</div></div>","PeriodicalId":94356,"journal":{"name":"Soil & Environmental Health","volume":"3 4","pages":"Article 100172"},"PeriodicalIF":0.0000,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Soil & Environmental Health","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2949919425000457","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
This letter questions the sole attribution of enhanced plant growth and arsenic accumulation to P availability in Hu et al. (2025), arguing that Ca, a co-delivered nutrient in all treatments, may be a confounding factor. Emerging evidence highlights Ca's critical role in plant growth, water use efficiency, and arsenic uptake, necessitating careful consideration in experimental designs. The letter recommends experimental designs that disentangle P and Ca effects to strengthen the mechanistic understanding of nutrient-driven phytoremediation.
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