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2.6.4.c Determining the quantity of soil improvers and fertilisers to apply

What is the annual loss per hectare?

The annual loss of organic matter must at the least be compensated to maintain the soil balance. Soil analysis gives an approximate value for the loss of OM by mineralisation (coefficient k2) that must be replaced. This value should be adjusted depending on whether cuttings after pruning are returned to the plot or not.
Example: on a typical plot where the cuttings are not returned to the soil, the loss is estimated at 300 kg/ha/year. Over four years, a minimum of 1.2 tons of organic matter should be added. Assuming that the chosen input contains 450 kg of organic matter per ton, it will be necessary to apply a minimum of three tons per hectare over the four years.

What is the yield objective?

Yield is obviously a key factor in fertilisation planning. The higher the yields, the greater the quantity of soil improvers and fertilizers required. It is therefore necessary to adjust the quantities applied to the production objectives.

Is it necessary to increase the final percentage of OM?

If the basic organic matter level is low, the objective will be to increase it slightly to improve the soil properties. A rich OM soil improver should then be added regularly in order to compensate for the losses, production and enrichment of the plot.

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