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The status of phosphorus levels in Iranian agricultural soils — a systematic review and meta-analysis

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Abstract

Phosphorus (P) inputs are essential for maximizing agronomic potential, yet high P inputs and subsequent P losses can cause eutrophication of water bodies. There is a need to evaluate P contents in agricultural soils globally both from an agronomic and environmental perspective. This systematic review and meta-analysis estimated the pooled mean levels of P contents of Iran. In this study, data on available and total P contents of Iran’s calcareous soils was compiled (main focus on Olsen P) and compared to (i) estimated Iranian background and global agricultural soil P contents, and (ii) agronomic and (iii) environmentally critical Olsen P values. The pooled mean estimate from the meta-analysis indicates that the levels of Olsen P across 425 soil samples (27 studies) were 21.3 mg kg−1 and total P across 190 soil samples (12 studies) 805.5 mg kg−1. Using 26 mg kg−1 as the agronomic critical Olsen P value above which no increase in crop yield occurs, crops grown on 61% of the soil samples in the investigated region would respond to P fertilizer and 20% of soils are currently in the optimum category (26–45 mg kg−1 Olsen P). The environmentally critical Olsen P value (~ 63 mg kg−1), defined as the amount above which P leaches from soil rapidly, was exceeded by 11% of soils with a further 4% of soils with elevated eutrophication risk. To maximize crop yields while maintaining a minimal risk of P leaching in Iran’s calcareous soils, we suggest an ideal Olsen P of 26 mg kg−1. The outcomes from this study inform about the P status of Iranian soils and could help update recommendations for P fertilizer applications in calcareous soils globally. The framework presented here could further be adopted to evaluate the P status in other soil types.

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The data that support the findings of this study are available from the corresponding author, upon reasonable request.

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All authors contributed to the study conception and design. All authors read and approved the final manuscript. Mohsen Jalali: conceptualization, formal analysis, funding acquisition, investigation, project administration, resources, supervision, and writing — original draft. Wolfram Buss: data curation, formal analysis, methodology, validation, visualization, and writing — review and editing. Fatemeh Parviznia: investigation and writing — review and editing. Mahdi Jalali: formal analysis, validation, and writing — review and editing.

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Correspondence to Mohsen Jalali.

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Jalali, M., Buss, W., Parviznia, F. et al. The status of phosphorus levels in Iranian agricultural soils — a systematic review and meta-analysis. Environ Monit Assess 195, 842 (2023). https://doi.org/10.1007/s10661-023-11412-5

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  • DOI: https://doi.org/10.1007/s10661-023-11412-5

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