A soil analysis allows to know the capacity of the soil to provide of the mineral elements to Cultures

For this reason periodically of the soil analyzes are carried out on my farm by the laboratory LCA of La Rochelle

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It all starts by a levy of earth

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The choice of the levy is very important, it must be representative of the whole plot (not on a border or on a atypical area)

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With an auger

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Samples of the soil are retrieved has a depth of approximately 15 to 20 centimeters. There will be 4 to 5 specimens in the chosen area you prefer a representative area of a hundred square meters that samples of in the entire parcel (risk of choosing areas too heterogeneous to have a reliable analysis)

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The various levies are mixtures

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Then we fill a bag or will be inscribed the name of the field

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For a follow-up to the parcel the GPS data of the levies are reflected in the packing slip for accompanying analyzes

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We will join in the information sheet on the plot:
Previous,
Inputs of manure,
Presence of pierres,etc ...

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The samples are sent to the laboratory

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To comment on an analysis we take into account indicators

The first is known: The capacitee the tank of the soil

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It is the CEC (cation exchange capacity)This is the tank measurement to receive all cations (calcium,magnesium,potassium ..... )
The CEC is a measure of the number of negative charges existing in the soil,the cations,positive charges attach to the negative charges of the CEC
EX: a CEC less than 10 is small
It cannot fix a lot of elements,but the released easily
Therefore:it is better split the inputs it is a ground with little organic matter and little clay

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EX:a CEC greater than 15 is great
It can attach most of the elements, but the technicalities more firmly it is a soil with a lot of organic matter and clay rich in

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To find out if the tank on the ground is full or empty it takes into account the PH it is an indirect measure of the filling
If the PH is below 6.2 the tank is not full (liming recommended)
If the PH is above 7.4 the tank overflowing (nothing can be changed)

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The rate of saturation of the CEC
It is the fill level in the reservoir that is the ratio, expressed as a percentage between the sum of cations (magnesium, sodium, potassium.. )and the size of the CEC
If the rate is lower than 70 %for the prairies to 80% for the land plowed the tank is not quite full,it will be necessary to add the cations mainly calcium (liming)
If the rate is higher than a 100% there is fine particles of calcium-free non-laid down by the CEC

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Beyond 150% of the phosphorus is retained by the calcium there is nothing we can do it will bring in soluble form at the time of the needs of the plant

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The second step will be to verify that each element is included in a fork in any case the content must not be less than the minimum value or greater than the maximum value
Either it will be necessary to increase the manuring if content is less than (the reorganization is necessary)
In the case or it is greater than can be done in manuring impasse for the element concerned
In a soil can profound because of the low rooting for the plant is the elements for this develop ,stay within a range high
In dry climate it will also be necessary to increase the potassium which increases the resistance to drought

The most demanding crop phosphorus are:
Potatoes
Rapeseed

The most demanding in potassium are:
Legumes
Cabbage
This are examples of that will have to take into account the consumption of plants depending on the species and assess the potential returns to control the costs

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BUY THE EWES LACAUNES

Ewes and ewe lambs
CONTACT FOR COMMANDS
G . E . B . R . O
Grouping of sheep farmers of the basin of Roquefort
The pommiere Lauras
Around 12250 Roquefort
Mail the manager: dgrasset@ragt.fr

TEL: 05 65 59 91 27
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