
%0 Journal Article
%A Lamont, B 
%T The Effect of Soil Nutrients on the Production of Proteoid Roots by <I>Hakea</i> Species
%J Australian Journal of Botany
%D 1972/04/01
%V 20
%N 1
%P 27-40
%K 
%R https://doi.org/10.1071/BT9720027
%U https://www.publish.csiro.au/paper/BT9720027 
%X The mode of the proteoid root response curve occurs at a considerably lower level of nitrogen or phosphorus than that of the response curve for non-proteoid roots. As a consequence, the relationship between proteoid and non-proteoid roots can be regarded as passing through four phases as nutrient availability increases: (a) an increase in proteoid root production as non-proteoid root growth increases; (b) a decrease in proteoid root production as non-proteoid root growth increases; (c) a decrease in proteoid root production as non-proteoid root growth decreases; (d) an absence of proteoid roots as non-proteoid root growth decreases. Only the first two phases are considered relevant to plants growing under field conditions. It is concluded that nutrient concentration in a number of soils, especially nitrogen availability, largely determines the relative contribution of proteoid roots to the root systems of two species of Hakea. 
