Evolution of the total microflora and population of nitrifiers in a soil fertilized with cattle slurry, over a period of 33 months
1986
Acea, M.J. | Diaz-Ravina, M. | Carballas, T. (Consejo Superior de Investigaciones Cientificas, Santiago de Compostela (Spain). Instituto de Investigaciones Agrobiologicas de Galicia)
For 33 months, variations in the total microbial population and in the number of ammonium and nitrite oxidizer microorganisms of a soil treated with or without cattle slurry were studied. The soil was a ranker over granite under grass. The treatment with cattle slurry significantly increased the total microbial population; the number of nitrifiers also increased but at a slower rate. The total microflora fell quickly after a short time; a second and or a third treatment did not show effect of the first one, but the reverse was true for the nitrifiers. After some time all the microorganisms tend to return to their initial levels though their densities were higher than the respective values of the unfertilized soil along the experimental period
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