productivity of pine plantations in relation to previous land use. II. Phosphorus adsorption isotherms and the growth of pine seedlings

The improved growth of pine plantations on pasture soils compared with that on soils which previously supported native eucalypt forest is primarily explained in terms of soil phosphorus. Pasture development has resulted in a decrease in the P adsorption maximum of about 300 µg g⁻¹ soil, a figure whi...

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Bibliographic Details
Published in:Plant and soil 1981-01, Vol.61 (3), p.329-339
Main Authors: Skinner, M.F, Attiwill, P.M
Format: Article
Language:English
Subjects:
Acid soils
Adsorption
Agricultural soils
Clay soils
Forest soils
Pastures
Phosphorus
Pine trees
Pinus radiata
Seedlings
Soil solution
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Summary:The improved growth of pine plantations on pasture soils compared with that on soils which previously supported native eucalypt forest is primarily explained in terms of soil phosphorus. Pasture development has resulted in a decrease in the P adsorption maximum of about 300 µg g⁻¹ soil, a figure which agrees with the increase in total P due to the application of superphosphate. P adsorption isotherms were used to calculate additions of P to give comparable levels of soil solution P in eucalypt and pasture soils. The growth of pine seedlings in soils thus amended showed a strong N × P interaction. When P was non-limiting, addition of N raised productivity of the eucalypt soil above that of the pasture soil. It is postulated that the different nature of the N × P interaction in eucalypt and pasture soils results from differences in the nitrogen cycle in the two soils.
ISSN:0032-079X
1573-5036
DOI:10.1007/BF02182014