Plant and Soil

, Volume 227, Issue 1, pp 59–65

Stem tissue phosphorus as an index of the phosphorus status of Banksia ericifolia L. f.

  • S.E. Parks
  • A.M. Haigh
  • G.C. Cresswell
Article

DOI: 10.1023/A:1026563926187

Cite this article as:
Parks, S., Haigh, A. & Cresswell, G. Plant and Soil (2000) 227: 59. doi:10.1023/A:1026563926187

Abstract

The effects of P fertilizer rate on shoot growth and the total P concentration of the whole shoot, new and mature leaves, symptom leaves and stems of Banksia ericifolia L. f., a P-sensitive species, were investigated in a six month greenhouse pot experiment. Shoot dry weight of plants growing in an Australian sedge peat, coarse sand and perlite potting mix (1:1:1) increased with up to 100 mg P L−1 supplied as a six month controlled release P (0:18:0) fertilizer, but was reduced by toxicity at the highest application rate (200 mg P L−1). Plants receiving this treatment developed chlorotic new and mature leaves. Leaf symptoms observed at rates of 60–100 mg P L−1 were confined to old leaves and were related to the P concentration of the shoot. Growth was not affected at these rates. The P concentration of stems was strongly influenced by P supply. This tissue acted as a sink for excess P, helping to regulate the P concentration of leaves. The approximate range of P concentrations in stem tissue, associated with greater than 90% of maximum shoot dry weight, was 0.5–1.5 g P kg−1 tissue dry weight. This was greater than that calculated for mature leaves (0.5–0.8 g kg−1) or for whole shoots (0.5–1.2 g kg−1). This wider range, and the capacity to store P in excess to requirement, makes the stem a better index tissue for plant P status than either leaves or whole shoots.

Banksia ericifolia phosphorus nutrition Proteaceae stem 

Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • S.E. Parks
    • 1
  • A.M. Haigh
    • 1
  • G.C. Cresswell
    • 2
  1. 1.Center for Horticulture and Plant SciencesUniversity of Western Sydney, HawkesburyRichmondAustralia
  2. 2.Cresswell Horticultural ServicesGrose ValeAustralia

Personalised recommendations