New Zealand Journal of Agricultural Research abstracts

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A survey of soil physical properties on sheep and dairy farms in southern New Zealand

J. J. DREWRY

AgResearch
C/- Soil and Physical Sciences Group
Soil, Plant and Ecological Sciences Division
P.O. Box 84
Lincoln University
Canterbury, New Zealand

R. P. LITTLEJOHN
R. J. PATON

AgResearch
Invermay Agricultural Centre
Private Bag 50034
Mosgiel, New Zealand

Abstract  The study compared soil macroporosity, bulk density, air permeability, and hydraulic conductivity on 97 sheep and 87 dairy farm sites surveyed in Southland and South Otago, New Zealand. Soil physical properties of 4 soil groups (15 soils) were investigated. Soils on sheep farms surveyed had significantly greater air permeability than soils on dairy farms, averaged over 0-15 cm. Soils on sheep farms had significantly greater saturated hydraulic conductivity (86 mm h^-1 and 26 mm h^-1) than soils on dairy farms (32 mm h^-1 and 10 mm h^-1), at 0-5 cm and 10-15 cm, respectively. Macroporosity decreased from 0-5 cm to 5-10 cm, at a significantly greater rate on dairy farms (by 3.6% v/v) than sheep farms (by 1.5% v/v). Bulk density increased between 0-5 cm and 5-10 cm by a greater amount for dairy farms (0.16 Mg m^-3) than for sheep farms (0.12 Mg m^-3). Macroporosity on some Fragic Pallic Soils was considered limiting for plant growth, while Firm Brown Soils were regarded as well structured and most likely to resist treading damage.

Keywords  compaction; treading; soil structure; pugging; cattle; macropores

New Zealand Journal of Agricultural Research 2000, Vol. 43: 251-258

0028-8233/00/4302-0251 $7.00/0 (c) The Royal Society of New Zealand 2000

PDF file of entire paper: medium quality (602K); (scanned from paper original: notes about this process)

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