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Liming and Lime‐Phosphorus‐Zinc Interactions in Two Nigerian Ultisols: I. Interactions in the Soil
Author(s) -
Friesen D. K.,
Juo A. S. R.,
Miller M. H.
Publication year - 1980
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1980.03615995004400060018x
Subject(s) - lime , ultisol , chemistry , soil water , soil ph , zinc , phosphorus , sorption , saturation (graph theory) , incubation , phosphate , environmental chemistry , adsorption , zoology , soil science , geology , mathematics , metallurgy , materials science , biochemistry , organic chemistry , combinatorics , biology
Interactions of lime, phosphorus (P), and zinc (Zn) in two coarse‐textured Ultisols from southeastern Nigeria were examined by means of factorial soil incubation and phosphate sorption experiments. In both soils, liming reduced exchangeable aluminum (Al) saturation from 45% to < 5% at pH 5.0 and soil solution Al concentration to < 1.0 µg/ml also near pH 5.0. There was no significant lime‐P interaction on active Al levels, indicating a lack of any ameliorating value of P on Al toxicity. Adsorption isotherms showed that liming reduced P adsorption in both soils at equilibrium solution concentrations of approximately 0.2 µg P/ml or higher, but at lower concentrations the effect became inconsistent. Soil incubation studies indicated that the concentration of P in soil solution (null‐point estimate) was first reduced by lower rates of lime then increased when soils were limed to approximately pH 6.0 or higher. Zinc activity in soil solution declined sharply when soils were limed to pH above 5.0, but was unaffected by P applications within the pH range studied (pH 4.3 to 7.2).