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Last update: May 2021

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Organic matter in the soils

The main agronomic quality expected of composts is organic conditioning, enabling the stock of organic matter in the soil to be maintained. This conditioning value is linked with the quality of organic matter in the organic waste products (OWPs). The results of the QualiAgro test, combined with those from other field tests, are currently being used to create an OWPs typology that will enable the conditioning value of OWPs to be predicted based on indicators. The data are also used to configure models of change dynamics in C levels in soils.

Characteristics of composts and manure

The spread organic waste products (OWP) an OM (organic matter) content of between 34% and 57% DM (BIO < GWS < FYM < MSW). Ho...
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Flows of C entering into the soil

Carbon entering into the soil comes from crop residues and the spreading of OWP. These flows are of the same order of magnitude over the 1998-2005...
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Change in C levels and stocks in soils

Organic C levels increase in soils that receive OWP and decrease in the control plots. The increases are largest for GWS compost and FYM, slightly...
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Humic balance of spreadings

The theoretical change in C content in soils is calculated according to the humic balance proposed by Hénin-Dupuis (1945) and compared with results...
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Modelling the dynamic of organic matter

Modelling allows us to predict over the longer term the change in OM levels in soils on which spreading has been carried out. The Hénin-Dupuis model...
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