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Note: Your soil test results and your crop and/or animal need
of calcium and/or magnesium will help you decide which lime to buy.
Our high quality liming products
are:
| Agricultural lime (calcium carbonate)
(AgLime). It is the most commonly used liming material. It consists of
limestone crushed to a fine powder and is usually the most cost-effective material for correcting
soil acidity. Good quality lime has 37-40% calcium. |
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FOR SOUTH EAST SA
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| Nutrilime® is a brand of
high calcium-only blend of Calcium Carbonate and Calcium Hydroxide |
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| Dolomite (Hi-Mag or Mag Lime) has calcium and magnesium
carbonate. Good quality dolomite has an NV of 95-98, and contains 22% calcium and 12% magnesium. It
is good for acid soils where supplies of calcium and magnesium are low, but if used constantly may
cause a nutrient imbalance, because the mix is two parts calcium to one part magnesium (2:1),
whereas the soil ratio should be around 5:1. |
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| Magnesite (magnesium carbonate) is made from crushed magnesium
carbonate rock. It has an NV of 95-105 and is used where there is a soil magnesium deficiency. |
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Gypsum (calcium sulphate) is classified by the Fertilisers Act
as a liming material, but is not considered one in agriculture because it does not reduce soil
acidity. Although it is used mainly to improve structure of sodic clay soils, it also reduces
aluminium levels when applied to some soils.
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Calcium is required in cell division, cell wall strength, hormone/enzyme synthesis and
increase the plant's ability to resist pathogen attack. Calcium in the soil prevents the dispersion
of clays and as such assists its aggregation, thus allowing root and water penetration. Calcium
also acts to reduce soil sodicity, where Sodium ions are replaced by Calcium ions in the soil
solution.
Sulphur is a plant macronutrient and is essential in protein synthesis and flavour development of many
crops. Microbes in the soil also require Sulphur for their growth and development.
Thus gypsum is most important where soils are dispersive and require aggregation, as in hard-setting
heavy clays. Gypsum use will ultimately encourage better rooting of crops in dispersive soils. Gypsum
is also important in the provision of adequate sulphur for plant nutrition. |
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