New Zealand Journal of Agricultural Research abstracts
Comparative nutrient responses by Pinus radiata, Trifolium
repens, Dactylis glomerata, and Hieracium pilosella on a
Mackenzie Basin outwash plain soil
M. R. DAVIS
Forest Research Institute
P. O. Box 465
Rangiora, New Zealand
Abstract The nutrient responses by a pine (
Pinus
radiata), a pasture grass (cocksfoot,
Dactylis glomerata), a pasture
legume (white clover,
Trifolium repens), and a hawkweed (mouse-ear
hawkweed,
Hieracium pilosella), were compared in a pot trial using a
Mackenzie Basin outwash plain soil. Responses to nitrogen (N) and phosphorus
(P) were tested alone and in combination, whereas responses to sulphur (S),
potassium (K), magnesium (Mg), micronutrients, and lime were tested only in the
presence of both N and P. All species responded to N and P, and to S and lime
in the presence of N and P, but none responded to K, Mg, or micronutrients. N
was the major deficient nutrient for the non-legume species, with grass and
hawkweed responding by 700% in the presence of added P, whereas pine showed a
much smaller (56%) response. Clover showed the greatest response to P. Hawkweed
showed the smallest response to P, but the greatest responses to S and lime.
While pine responded to the same nutrients as the herbaceous species, it is
suggested that the responses by pine occurred before mycorrhizae formation, and
may be more pertinent to seedlings establishing from seed in the absence of
mycorrhizae, than to plants with well-developed mycorrhizal root systems. The
responses by pine to N, P, S, and lime reported here therefore need to be
confirmed with plants which possess mycorrhizal root systems at the time of
fertiliser application. The comparative nutrient responses by mouse-ear
hawkweed are discussed. It is suggested that hawkweed is efficient at absorbing
P, an attribute that would be of competitive advantage in soils with low P
availability and which may have contributed to its widespread invasion of the
tussock grasslands.
Keywords Dactylis glomerata; Hieracium
pilosella; high country; Mackenzie Basin; nutrient response; Pinus
radiata; Trifolium repens
New Zealand Journal of Agricultural Research, 1997, Vol. 40: 9-16
0028-8233/97/4001-0009 $2.50/0 (c) The Royal Society of New Zealand
1997
PDF file of entire paper: medium quality (1338K); (scanned from paper original: notes about this process)
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