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An appraisal of nutrient supplies available for tree growth in a pumice soil
Abstract
Chemical analyses have confirmed and explained the results of an earlier pot trial in which the availability of major nutrients in six pumice ash layers of Kaingaroa silty sand was assessed by the growth of radiata pine seedlings.
Almost all of the tree-available P is found in the present topsoil: the quantities-of P that occur in two buried soils (Waimihia and Rotoma ashes) are almost entirely in the form of organic P which is apparently very resistant to breakdown due to complexing with allophane. The N in these layers is similarly unavailable.
The mineral layers, about 4 ft in thickness (Taupo pumice and lapilli), which lie between the present topsoil and the uppermost buried soil, are very low in total N and P and exchangeable Mg, but relatively high in exchangeable K. Only the lower buried soil contains a reasonable quantity of exchangeable Mg and has a Mg : K ratio in favour of Mg.
Type
Journal Article
Type of thesis
Series
Earth Science Journal
Citation
Knight, P.J. & Will, G.M. (1970). An appraisal of nutrient supplies available for tree growth in a pumice soil. Earth Science Journal, 4(1), 1-16.
Date
1970
Publisher
Waikato Geological Society, The University of Waikato
Degree
Supervisors
Rights
© 1970 Waikato Geological Society, The University of Waikato. All items in Research Commons are provided only to permit fair dealing for the purposes of research or private study. They are protected by copyright with all rights reserved unless otherwise indicated.