DGT technique to assess P mobilization from greenhouse vegetable soils in China: A novel approach

The Science of the Total Environment
Yusef Kianpoor KalkhajehHans Christian Bruun Hansen

Abstract

Intensive phosphorus (P) inputs to plastic-covered greenhouse vegetable production (PGVP) in China has led to excessive soil P accumulation increasing the potential for leaching to surface waters. This study examined the mobility and hence the potential risk of P losses through correlations between soil solution P (PSol) and soil extractable P as determined by conventional soil P test methods (STPs) including degree of P saturations (DPSs), and diffusive gradient in thin-films (DGT P) technique. A total of 75 topsoil samples were chosen from five representative Chinese PGVPs covering a wide range of physiochemical soil properties and cultivation history. Total P and Olsen P contents varied from 260 to 4900, and 5 to 740mgkg-1, respectively, while PSol concentrations were between 0.01 and 10.8mgL-1 reflecting the large differences in vegetation history, fertilization schemes, and soil types. Overall, DGT P provided the best correlation with PSol (r2=0.97) demonstrating that DGT P is a versatile measure of P mobility regardless of soil type. Among the DPSs tested, oxalate extractable Al (DPSOx-Al) had the best correlation with PSol (r2=0.87). In the STP versus PSol relationships, STP break-points above which P mobilization increa...Continue Reading

References

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May 16, 2013·Journal of Environmental Quality·Helena AnderssonHolger Kirchmann
May 24, 2014·Environmental Science & Technology·Jun LuoHao Zhang
Feb 26, 2016·Environmental Science & Technology·Daniel Menezes-BlackburnPhilip M Haygarth
Nov 30, 2016·Journal of Environmental Quality·Marie van MaarschalkerweerdPeter E Holm
Jan 14, 2017·Chemosphere·Yusef Kianpoor KalkhajehHans Christian Bruun Hansen
Mar 9, 2017·Journal of Hazardous Materials·Dong-Xing GuanLena Q Ma

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