New Zealand Journal of Agricultural Research abstracts
Sustainability of New Zealand high-country pastures under contrasting
development inputs. 1. Site, and shoot nutrients
D. SCOTT
AgResearch
P.O. Box 60
Lincoln, New Zealand
Abstract Two adjacent studies of sheep-grazed mixed-species
pasture, on a Pukaki/Tekapo high country soil, have been on-going since 1982.
One compared 30 combinations of 5 increasing growth regimes (0-500 kg
ha-1 yr-1 superphosphate +irrigation) <-> 3
stocking rates <-> 2 stocking methods; the other compared 27 combinations
of P and S fertiliser (0-100 kg ha-1 yr-1). Summer shoot
concentrations of P, S, N, and other macro- and micro-nutrients in Lupinus
polyphyllus, Trifolium ambiguum, T. hybridum, T.
repens, T. pratense, Hieracium pilosella, Festuca
rubra, and Dactylis glomerata are reported for the PxS study.
Dactylis glomerata was notable for its large change in shoot P and S
concentration with changes in P and S soil levels, whereas Lupinus
polyphyllus and Festuca rubra showed low variation in S shoot
concentration, and Hieracium pilosella low variation in shoot P
concentration, under varying fertilisers rates and combinations. Species tended
to have their highest shoot S concentration where they made their major
contribution in mixed swards. Herbage Se, I, and Na levels were low to
deficient for sheep nutrition.
Keywords New Zealand; high country; nutrient content; P; S;
N; Lupinus polyphyllus; Trifolium ambiguum; T.
hybridum; T. repens; T. pratense; Hieracium
pilosella; Festuca rubra; Dactylis glomerata
New Zealand Journal of Agricultural Research, 1999, Vol. 42: 365-383
0028-8233/99/4204-0365 $7.00/0 (c) The Royal Society of New Zealand
1999
PDF file of entire paper: medium quality (2084K); (scanned from paper original: notes about this process)
This year's abstracts |
Journal home page |
All abstracts |
Publishing home page
