APPLICATION
APPLICATION OF LIME
The following quantities of agricultural lime are required to increase the pH of the
various soil types:
Soil texture From pH 4,5–5,5 t/ha From pH 5,5–6,5 t/ha
Sand and sandy loam 0.5 0.75
Sandy loam 1.0 1.5
Loam 1.5 2.0
Silt loam 2.5 3.0
Clay loam 3.0 4.0
These quantities must only be used as a guideline.
How often must lime be applied and
when?
About once every 3–4 years on average in the case of heavy soils. The optimum
effect of lime application on these soils only becomes apparent 2–3 years after
application.
Test the pH again after 3 years to decide whether more lime is required. Smaller
quantities of lime applied more often will eliminate the risk of too much
lime in sandy soil. Lime can be applied at any time of the year, but preferably
immediately before ploughing. In contrast to fertiliser, lime reacts slowly in
the soil, which is why it should be applied at least 6–8 weeks before planting or
so wing.
The action of lime
This is a chemical process that can only take place when moisture is present in
the soil. Effectiveness depends on how well the lime has been mixed with the
soil and how fine the lime is. Agricultural lime and dolomitic lime contain fine
as well as coarse particles. The fine material reacts quickly while the coarser
particles have a long-term effect.
The coarse particles should not be larger than 2 mm. The effect of agricultural
lime or dolomitic lime usually only becomes apparent 6–8 weeks after
application. Thereafter it builds up and reaches a peak after about 2 years.
Differences between agricultural lime
and dolomitic lime
☛Agricultural lime is calcium carbonate (CaCO 3 ), while dolomitic lime is a
compound of about equal quantities of calcium and magnesium carbonate
(CaCO 3 + MgCO 3 ). Dolomitic lime should be used on acid soils where
magnesium deficiencies also occur.
☛Dolomitic lime is slightly less soluble than agricultural lime, but its
neutralising effect is about 10% more effective, with the result that the
quantity applied can be reduced by 10% to achieve similar results.
Compiled by Directorate Communication, National Department of Agriculture in
co-operation with the Fertiliser Society of South Africa For further information
consult the Fertiliser Society of South Africa P.O. Box 75510, Lynnwood Ridge 0040
Tel: (012) 349 1450 • Fax: (012) 349 1463
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