Soil Aggregate Size Affects Phosphorus Desorption from Highly Weathered Soils and Plant Growth

Because plant absorption of P depends on the desorption of P from soil, understanding P desorption from soils may improve the precision of P diagnosis and fertilization recommendations. Many soils with high P retention due to high levels of Fe and Al are also highly aggregated. Extractable P is some...

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Bibliographic Details
Published in:Soil Science Society of America journal 2001-01, Vol.65 (1), p.139-146
Main Authors: Wang, X., Yost, R.S., Linquist, B.A.
Format: Article
Language:English
Subjects:
Absorption rates
Agronomy. Soil science and plant productions
Biological and medical sciences
Chemical, physicochemical, biochemical and biological properties
Experiments
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Glycine max
Lactuca sativa
Mineral components. Ionic and exchange properties
Nitrogen, phosphorus, potassium fertilizations
Phosphorus
Phosphorus fertilization
Physics, chemistry, biochemistry and biology of agricultural and forest soils
Plant growth
Soil science
Soil-plant relationships. Soil fertility. Fertilization. Amendments
Soils
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Summary:Because plant absorption of P depends on the desorption of P from soil, understanding P desorption from soils may improve the precision of P diagnosis and fertilization recommendations. Many soils with high P retention due to high levels of Fe and Al are also highly aggregated. Extractable P is sometimes higher on larger size aggregates, which will probably result in increased P release from aggregates. The effects of aggregate size on P availability of three highly weathered soils were quantified with a column‐leaching study and a pot experiment. Phosphorus desorption by leaching from small aggregates was greater than that from large aggregates when P had been added to the bulk soil (Kapaa and Leilehua soils) and a mixture of different‐sized aggregates (Leilehua soil). When aggregates were separated and then P added, however, P desorption was greater from large aggregates (4–6 mm) than from small aggregates (
ISSN:0361-5995
1435-0661
DOI:10.2136/sssaj2001.651139x