Ground quicklime


Recommendations : Keep dry - resealed after use - spread with gloves on a calm day with no wind.

Average dosage

10 kg for 100m2

Periods of use

Our advice liming

Maintenance liming Ph >6 : it involves reasoned contributions to offset the losses of soil without calcium reserves. We recommend that such farmers to liming 1/3 of their agricultural land per year by ignoring the fertilizer. Strength : wheat, corn and other crops : 1 ton/hectare. Alfalfa : 2 tons/hectare.

Liming recovery Ph <5 : it is used to fill an important gap in soil calcium. Strength : wheat, corn and other crops : 2 tons/hectare. Alfalfa : 2.5 tons/hectare.


Learn more about the amendments

The soil's nature

Deux-Sèvres soils are predominantly acidic and relatively poor in carbonates.

The causes are multiple :

- eaching by rain (loss of 200 to 500 jg of CaO per hectare per year)

- export crop

- effects of some fertilizers

This natural acidity is maintained by the fact that the roots reject H ions and nitrate leaching also mobilizes H ions. PH measures acidity of the soil (the H ion concentration of the soil solution). It affects a large number of chemical and organic phenomena.

The acidity effects

- Physical effects : "poor ventilation", hard water circulation, deflocculation of clays, silty soils icing.

- Chemical effects : blocking nutrient, reduced microbial activity (bad degradation of organic matter), saturation of the clay-humus complex with toxic ions for the plant.

The PH factor
The pH is an important indicator, but it is subject to seasonal variation and soil moisture. The pH is higher in winter and lower in summer (difference 0.5 points). The ideal is to take during normal humidity (avoid June to September) and before plowing or providing amendment. PH too low or too high can block the availability of trace elements and make them less available phosphoric acid and potash. A compromise is to be found in pH, depending on the types of crops and the risk of deficiency in trace elements. A target of 6 to 6.2 in cultures grassland system is recommended, it will be higher in vegetables (6.5 or more).
Neutralizing value
The recovery of pH reasons in need bases (BEB) expressed in neutralizing values. The neutralizing value (NV) is the ability of the amendment to neutralize soil acidity: 1 kg CaO equivalent to one unit VN and 1 kg of MgO (magnesium) to 1.4 units VN.

To raise one point pH, we must make on average 3,500 neutralizing units/ha values. Maintenance requirements are depending the system. For standard situation in maintenance, bring 300 units neutralizing values​​/ha and 150 units if regular manure or poultry manure (rich in carbonates).

The basic amendments are distinguished according to their composition in CaO, MgO, giving their neutralizing value. We also distinguish the potential speed of action of the product depends on the fineness and the type of rock. It can be fast, medium fast or slow.
Cooked or raw products
Cooked products such as quicklime and magnesium lime have neutralizing values of 90 to 100 units per 100 kg of product. Their action is very fast.

For raw products, products based on their fine a distinction. The purpose products such as calcium carbonate have a neutralizing value 46 to 54 units per 100 kilograms. The action is fairly fast for the ground and fast to soft and powdered products.

The crude products (wet lime carbonate, limestone sand) have a neutralizing value between 32 (sand) and 52 (carbonates). Their action is slow.
Speed of action
Reflect the neutralizing value and speed of action to select a basic amendment. Choose acting products fast or slow depending on the urgency of liming. In maintenance liming, swift action is not very important. Each type of product requires specific hardware (powder, crude, wet product) for the application. It is strongly advised to avoid, as much as possible, contributions too close ammonia-rich waste (manure) and fast-acting products, which would increase the risk of nitrogen loss. The ideal is to favor limings fall in inter-culture.






Lime carbonate


Magnesium carbonate


Quicklime amendment