New Zealand Journal of Agricultural Research abstracts
Temporal changes in some soil chemical properties at four depths following the
surface application of lime
D. M. Wheeler
AgResearch
Ruakura Agricultural Research Centre
Private Bag 3123
Hamilton, New Zealand
Abstract The effect of a surface application of lime (5000
kg/ha initially then 2500 kg/ha 1 year later) on soil properties in four soil
layers was measured over 15 years on a yellow-grey earth (Duric Palic soil).
The maximum increase in soil pH occurred about 2 years after lime was initially
applied in the 0-50 mm soil layer, after 5 years at 50-100 mm, after about 12
years at 100-150 mm, and was still increasing at 150-200 mm. The average rate
at which soil pH increased until a maximum difference occurred was 0.57, 0.15,
0.04, and 0.009 pH units/year in the 0-50, 50-100, 100-150, and 150-200 mm soil
layer, respectively. The average rates of soil re-acidification (rate of
decrease after reaching a maximum) were 0.075 and 0.02 pH units/year in the
0-50 and 50-100 mm layer, respectively. For exchangeable calcium (Ca), the
average rate of decrease after reaching a maximum was 0.82 and 0.17 cmol(+)
Ca/kg per year in the 0-50 and 50-100 mm soil layer, respectively. At this rate
of decrease, lime should increase soil pH in the 0-50 mm layer until about 17
years after application. Lime significantly decreased exchangeable magnesium
(Mg) for only 5 years, with the maximum decrease between 0 and 100 mm occurring
about 3 years after lime was applied. Below 100 mm, exchangeable Mg was about
0.2 cmol(+)/kg lower in the lime treatment from 5 years after lime was applied.
Lime decreased Olsen P at an average rate of 0.53 and 0.27 ug/ml per year in
the 0-50 and 50-100 mm layer, respectively up to 6 years after lime was
applied. This decrease was partly attributable to higher plant phosphorus (P)
uptake in the lime treatment.
Keywords aluminium; calcium; depth; lime; magnesium;
movement; pH; phosphorus; re-acidification
New Zealand Journal of Agricultural Research, 1997, Vol. 40: 309-316
0028-8233/97/4002-0309 $7.00/0 (c) The Royal Society of New Zealand
1997
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