Nouvelles informations relatives aux variations temporaires de l'activite nitrifiante d'un sol evaluee au laboratoire. incidences d'un apport de matieres organiques |
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Authors: | G Simon‐Sylvestre A Beaumont |
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Institution: | I.N.R.A., Station de Science du Sol , Route de St Cyr, Versailles, 78000, France |
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Abstract: | Abstract The results reported in this paper confirm the seasonal influence on soil nitrifying activity estimated in the laboratory. The variations of this activity depend on different factors: climatic conditions, soil nature, occurence of plants, characteristics of the organic matter added to the soil. A fresh organic matter (straw, for example) leads to reduced nitrifying activity immediately after its incorporation; its depressive action disappears after a month under laboratory condi‐tions. A decomposed organic matter, as a manure, produces no effect. This work also shows the seasonal variations of the mineral nitrogen immobilization after addition of a fresh organic matter. |
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Keywords: | Soil nitrifying activity soil sampling date climatic conditions soil nature organic matter addition |
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