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Appreciation simple de la maturite des composts urbains en relation avec leurs effets sur la production vegetale

Abstract : Samples of compost were taken from several composting plants after various times of maturation and were tested on lettuce and rye-grass. A marked depressive effect was observed on the yield of rye-grass grown on soil amended with raw compost compared to control soil ; this effect then vanished and even became positive after several months of maturation. With composts from the same origin, similar observations were made on lettuce : the dry matter and the amount of nitrogen exported increased with the length of maturation. The close correlation between oxygen consumption by composts and dry matter yield made it possible to establish relationships between maturity and biological or physico-chemical characteristics of composts. Moreover, these experiments led to the definition of maturity levels. From this work, two simple methods for the determination of maturity are suggested : 1 ) a respirometric method which requires an ordinary vessel, a 3-7 days incubation period and one kilogram of fresh compost sample. The results obtained with this method were in good agreement with laboratory studies ; 2) a physico-chemicat method in which easily degradable carbon compounds are analysed. The overall mineralization rate of carbon « T.M.G. 21 », which reflects the degree of stabilization of composts, was in fact related to the total organic content and the quality of soluble carbohydrates in the compost. Finally, it seems desirable to combine the oxygen consumption measurement and compost « T.M.G. 21 » determination to eliminate any bias induced by one or the other method.
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  • HAL Id : hal-02721268, version 1
  • PRODINRA : 110371

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Bernard Nicolardot, Rémi Chaussod, Jean-Louis Morel, Armand Guckert, D. Benistant, et al.. Appreciation simple de la maturite des composts urbains en relation avec leurs effets sur la production vegetale. Agronomie, EDP Sciences, 1986, 6 (9), pp.819-827. ⟨hal-02721268⟩

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