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Soil tests for available copper and zinc in soils of Western Nigeria
Author(s) -
Osiname Olumuyiwa A.,
Schulte Emmett E.,
Corey Richard B.
Publication year - 1973
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740241105
Subject(s) - soil water , zinc , copper , chemistry , organic matter , environmental chemistry , silt , soil test , soil ph , avena , agronomy , soil science , environmental science , geology , biology , paleontology , organic chemistry
Four soil tests for copper and zinc were evaluated for their ability to predict Cu and Zn uptake by oats ( Avena sativa , L., Lodi var.) grown on 28 soils from Western Nigeria. Statistical analyses showed that EDTA was a better extractant for predicting Cu uptake than was DTPA, 0.1 N ‐HCl or 1 N ‐HCl. Copper uptake was more strongly correlated with inorganic soil fractions than with organic matter and was not significantly affected by soil pH. The best prediction of Zn uptake was provided by a combination of 0.1 N ‐HCl extractable Zn, pH, organic matter and the silt plus clay fraction in a multiple regression analysis. All four extractants predicted plant Zn uptake better on soils of pH less than 6.0 than on soils of pH greater than 6.0. A significant amount of Cu and Zn in the soils appeared to be associated with sesquioxides, part of which was available for plant use.