ISSN:
1435-0661
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Populus ×euramericana— clone NC-5326) and switchgrass (Panicum virgatum L.)], and four replications per treatment. The Hedley fractionation scheme (dividing soil P into six empirical fractions [water-soluble, NaHCO3-soluble inorganic and organic P; NaOH-soluble inorganic and organic P; HCl-soluble P, and residual P)] was employed. After 6 yr of continuous application of biosolids to poplar plots, the absolute concentrations of all P fractions at the 0- to 5-cm depth increased significantly (P 〈 0.05). Some P fractions at the 5- to 20-cm depth increased significantly, whereas at the 20- to 35-cm depth, none of the fractions was affected by biosolids amendment. At the 0- to 5-cm depth of both poplar tree and switchgrass plots, the relative concentrations of some of the P fractions (e.g., HCl–P, NaOH–OP, and residual P) decreased rather than increased. Because NaHCO3–IP and H2O–P increased in the biosolids-amended soil at rates disproportionate to their concentrations in the biosolids, we conclude that HCl–P applied with biosolids was transformed to more labile forms.
Type of Medium:
Electronic Resource
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