New Zealand Journal of Agricultural Research abstracts

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Effects of triple superphosphate and Sechura phosphate rock on clover and nitrogen content of pasture

J. D. MORTON¹
M. B. O'CONNOR²
W. H. RISK³
L. NGUYEN⁴
A. G. SINCLAIR¹
P. D. JOHNSTONE¹
L. SMITH³
A. H. C. ROBERTS²

1AgResearch
Invermay Agricultural Centre
Private Bag 50034
Mosgiel, New Zealand
2AgResearch
Ruakura Agricultural Centre
Private Bag 3123
Hamilton, New Zealand
3AgResearch
Woodlands Research Station
RD 1, Invercargill, New Zealand
4National Institute of Water
P. O. Box 11-115
Hamilton, New Zealand

Abstract  The effect of annual applications of triple superphosphate (TSP) and Sechura phosphate rock (SPR) on clover content of permanent pasture was measured at seven sites in New Zealand. Clover content as a percentage of total pasture dry matter (DM) production (% clover) increased with phosphorus (P) application rate, and the response of % clover to P increased with time over 6 years. Most of the response occurred at P fertiliser rates up to the mean calculated maintenance rate of 25 kg P/ha per year, with little further response to twice this rate. The response in total pasture DM production to rate of P fertiliser was similar to the response in % clover. Near-maximum % clover was achieved with Olsen P levels of 12-15. Percentage clover responses to TSP and SPR did not differ significantly at equal rates of P. There was a significant relationship between % clover and % nitrogen in total DM.

Keywords  triple superphosphate; Sechura phosphate rock; fertiliser; clover content; nitrogen content

New Zealand Journal of Agricultural Research, 1994, Vol. 37: 569-575

0028-8233/94/3704-0569 $2.50/0 (c) The Royal Society of New Zealand 1994

PDF file of entire paper: medium quality (448K); (scanned from paper original: notes about this process)

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