Abstract
AbstractThe surface horizons of two field soils that had been amended with composted or liquid sewage sludge for 3 to 6 y were extracted with a series of reagents [KNO3, H2O, NaOH, EDTA (ethylenedinitrilotetraacetic acid), HNO3, in sequence] and with DTPA (1,4,7‐triazaheptane‐1,1,7,7‐pentaacetic acid) to characterize the zinc (Zn) pool in the soils with respect to lability and bioavailability. Statistical correlation analysis, comparing the extracted Zn fractions with the concentration of Zn in the leaves of barley (Hordeum vulgare L.) grown on the two soils, led to the following conclusions: (i) Zinc extracted by KNO3 and H2O in sequence is associated with the highly labile, soluble pool, dominated by Zn2+, which determines immediate bioavailability. (ii) Zinc extracted by KNO3, H2O, and NaOH in sequence has a strong, positive, 1:1 correlation with DTPA‐extractable Zn and, therefore, is associated with the labile, plant‐available Zn pool. (iii) EDTA‐extractable Zn represents a reservoir of potentially bioavailable Zn, and (iv) HNO3‐extractable Zn is associated with a nonlabile pool that is not bioavailable. These general relationships between extracted Zn fractions and bioavailability were applicable to both soils investigated and did not depend on the type of sludge applied or the length of time of sludge application.
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